SnS2

/Tag: SnS2

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

2019-03-12T10:34:28+00:00March 12th, 2019|Categories: Publications|Tags: , , |

Few‐layered SnS2 nanosheets vertically alligned on reduced graphene oxide nanosheets are demonstrated as high‐performance anode material for potassium‐ion batteries. Besides the high specific capacities based on sequential conversion and alloying reactions, excellent rate capability and cycling stability are also achieved by enhanced surface charge storage, fast electron/ionic transportation, and improved structural stability, benifiting from the subtle structure engineering. Abstract Anodes involving conversion and alloying reaction mechanisms are attractive for potassium‐ion batteries (PIBs) due to their high theoretical capacities. However, serious volume change and metal aggregation upon potassiation/depotassiation usually cause poor electrochemical performance. Herein, few‐layered SnS2 nanosheets supported on reduced graphene oxide ([email protected]) are fabricated and investigated as anode material for PIBs, showing high specific capacity (448 mAh g−1 at 0.05 A g−1), high rate capability (247 mAh g−1 at 1 A g−1), and improved cycle performance (73% capacity retention after 300 cycles). In this composite electrode, SnS2 nanosheets undergo sequential conversion (SnS2 to Sn) and alloying (Sn to K4Sn23, KSn) reactions during potassiation/depotassiation, giving rise to a high specific capacity. Meanwhile, the hybrid ultrathin nanosheets enable fast K storage kinetics and excellent structure integrity because of fast electron/ionic transportation, surface capacitive‐dominated charge storage mechanism, and effective accommodation for volume variation. This work demonstrates that K storage performance of alloy and conversion‐based anodes can be remarkably promoted by subtle structure engineering.

Published in: "Small".

Photodetectors: Ultrahigh‐Sensitive Broadband Photodetectors Based on Dielectric Shielded MoTe2/Graphene/SnS2 p–g–n Junctions (Adv. Mater. 6/2019)

2019-02-27T02:40:00+00:00February 27th, 2019|Categories: Publications|Tags: , , , |

In article number 1805656, Rui Chen, Liyuan Zhang, Youpin Gong, and co‐workers develop an h‐BN/MoTe2/graphene/SnS2/h‐BN van der Waals heterostructure to realize an ultrahigh‐sensitivity broadband (405–1550 nm) photodetector, due to its unique advantages for high‐efficiency light absorption and exciton dissociation. Graphene plays a key role in enhancing the sensitivity and broadening the spectral range, providing a viable approach toward future ultrahigh sensitivity and broadband photodetectors.

Published in: "Advanced Materials".

Ultrahigh‐Sensitive Broadband Photodetectors Based on Dielectric Shielded MoTe2/Graphene/SnS2 p–g–n Junctions

2019-02-27T02:39:49+00:00February 27th, 2019|Categories: Publications|Tags: , , , |

h‐BN/MoTe2/graphene/SnS2/h‐BN van der Waals heterostructure photodetectors present an extraordinary broadband responsivity exceeding 2.6 × 103 A W−1 and detectivity up to ≈1013 Jones in a wide spectrum, which is attributed to the enhanced light absorption and highly effective exciton dissociation originating from the vertical built‐in electric field and multiple photoactive layers in the unique heterostructures. Abstract 2D atomic sheets of transition metal dichalcogenides (TMDs) have a tremendous potential for next‐generation optoelectronics since they can be stacked layer‐by‐layer to form van der Waals (vdW) heterostructures. This allows not only bypassing difficulties in heteroepitaxy of lattice‐mismatched semiconductors of desired functionalities but also providing a scheme to design new optoelectronics that can surpass the fundamental limitations on their conventional semiconductor counterparts. Herein, a novel 2D h‐BN/p‐MoTe2/graphene/n‐SnS2/h‐BN p–g–n junction, fabricated by a layer‐by‐layer dry transfer, demonstrates high‐sensitivity, broadband photodetection at room temperature. The combination of the MoTe2 and SnS2 of complementary bandgaps, and the graphene interlayer provides a unique vdW heterostructure with a vertical built‐in electric field for high‐efficiency broadband light absorption, exciton dissociation, and carrier transfer. The graphene interlayer plays a critical role in enhancing sensitivity and broadening the spectral range. An optimized device containing 5−7‐layer graphene has been achieved and shows an extraordinary responsivity exceeding 2600 A W−1 with fast photoresponse and specific detectivity up to ≈1013 Jones in the ultraviolet–visible–near‐infrared spectrum. This result suggests that the vdW p–g–n junctions containing multiple photoactive TMDs can provide a viable approach toward future ultrahigh‐sensitivity and broadband photonic detectors.

Published in: "Advanced Materials".

Photodetectors: Ultrahigh‐Sensitive Broadband Photodetectors Based on Dielectric Shielded MoTe2/Graphene/SnS2 p–g–n Junctions (Adv. Mater. 6/2019)

2019-02-16T22:37:25+00:00February 16th, 2019|Categories: Publications|Tags: , , , |

In article number 1805656, Rui Chen, Liyuan Zhang, Youpin Gong, and co‐workers develop an h‐BN/MoTe2/graphene/SnS2/h‐BN van der Waals heterostructure to realize an ultrahigh‐sensitivity broadband (405–1550 nm) photodetector, due to its unique advantages for high‐efficiency light absorption and exciton dissociation. Graphene plays a key role in enhancing the sensitivity and broadening the spectral range, providing a viable approach toward future ultrahigh sensitivity and broadband photodetectors.

Published in: "Advanced Materials".

Remarkable Improvement in Photocatalytic Performance for Tannery Wastewater Processing via SnS2 Modified with N‐Doped Carbon Quantum Dots: Synthesis, Characterization, and 4‐Nitrophenol‐Aided Cr(VI) Photoreduction

2019-02-14T02:38:17+00:00February 14th, 2019|Categories: Publications|Tags: |

0D N‐doped carbon quantum dots (N23‐CQDs) are demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2. To promote carrier utilization, 4‐nitrophenol is taken as hole acceptor, and the efficiency of Cr(VI) photoreduction is further enhanced. Abstract Photocatalytic pathways are proved crucial for the sustainable production of chemicals and fuels required for a pollution‐free planet. Electron–hole recombination is a critical problem that has, so far, limited the efficiency of the most promising photocatalytic materials. Here, the efficacy of the 0D N doped carbon quantum dots (N‐CQDs) is demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2 photocatalytic system. N‐CQDs are in situ loaded onto SnS2 nanosheets in forming N‐CQDs/SnS2 composite via an electrostatic interaction under hydrothermal conditions. Cr(VI) photoreduction rate of N‐CQDs/SnS2 is highly enhanced by engineering the loading contents of N‐CQDs, in which the optimal N‐CQDs/SnS2 with 40 mol% N‐CQDs exhibits a remarkable Cr(VI) photoreduction rate of 0.148 min−1, about 5‐time and 148‐time higher than that of SnS2 and N‐CQDs, respectively. Examining the photoexcited charges via zeta potential, X‐ray photoelectron spectroscopy (XPS), surface photovoltage, and electrochemical impedance spectra indicate that the improved Cr(VI) photodegradation rate is linked to the strong electrostatic attraction between N‐CQDs and SnS2 nanosheets in composite, which favors efficient carrier utilization. To further boost the carrier utilization, 4‐nitrophenol is introduced in this photocatalytic system and the efficiency of Cr(VI) photoreduction is further promoted.

Published in: "Small".

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

2019-02-14T02:38:07+00:00February 14th, 2019|Categories: Publications|Tags: , , |

Few‐layered SnS2 nanosheets vertically alligned on reduced graphene oxide nanosheets are demonstrated as high‐performance anode material for potassium‐ion batteries. Besides the high specific capacities based on sequential conversion and alloying reactions, excellent rate capability and cycling stability are also achieved by enhanced surface charge storage, fast electron/ionic transportation, and improved structural stability, benifiting from the subtle structure engineering. Abstract Anodes involving conversion and alloying reaction mechanisms are attractive for potassium‐ion batteries (PIBs) due to their high theoretical capacities. However, serious volume change and metal aggregation upon potassiation/depotassiation usually cause poor electrochemical performance. Herein, few‐layered SnS2 nanosheets supported on reduced graphene oxide ([email protected]) are fabricated and investigated as anode material for PIBs, showing high specific capacity (448 mAh g−1 at 0.05 A g−1), high rate capability (247 mAh g−1 at 1 A g−1), and improved cycle performance (73% capacity retention after 300 cycles). In this composite electrode, SnS2 nanosheets undergo sequential conversion (SnS2 to Sn) and alloying (Sn to K4Sn23, KSn) reactions during potassiation/depotassiation, giving rise to a high specific capacity. Meanwhile, the hybrid ultrathin nanosheets enable fast K storage kinetics and excellent structure integrity because of fast electron/ionic transportation, surface capacitive‐dominated charge storage mechanism, and effective accommodation for volume variation. This work demonstrates that K storage performance of alloy and conversion‐based anodes can be remarkably promoted by subtle structure engineering.

Published in: "Small".

Photodetectors: Ultrahigh‐Sensitive Broadband Photodetectors Based on Dielectric Shielded MoTe2/Graphene/SnS2 p–g–n Junctions (Adv. Mater. 6/2019)

2019-02-11T08:49:49+00:00February 11th, 2019|Categories: Publications|Tags: , , , |

In article number 1805656, Rui Chen, Liyuan Zhang, Youpin Gong, and co‐workers develop an h‐BN/MoTe2/graphene/SnS2/h‐BN van der Waals heterostructure to realize an ultrahigh‐sensitivity broadband (405–1550 nm) photodetector, due to its unique advantages for high‐efficiency light absorption and exciton dissociation. Graphene plays a key role in enhancing the sensitivity and broadening the spectral range, providing a viable approach toward future ultrahigh sensitivity and broadband photodetectors.

Published in: "Advanced Materials".

Remarkable Improvement in Photocatalytic Performance for Tannery Wastewater Processing via SnS2 Modified with N‐Doped Carbon Quantum Dots: Synthesis, Characterization, and 4‐Nitrophenol‐Aided Cr(VI) Photoreduction

2019-02-08T10:40:54+00:00February 8th, 2019|Categories: Publications|Tags: |

0D N‐doped carbon quantum dots (N23‐CQDs) are demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2. To promote carrier utilization, 4‐nitrophenol is taken as hole acceptor, and the efficiency of Cr(VI) photoreduction is further enhanced. Abstract Photocatalytic pathways are proved crucial for the sustainable production of chemicals and fuels required for a pollution‐free planet. Electron–hole recombination is a critical problem that has, so far, limited the efficiency of the most promising photocatalytic materials. Here, the efficacy of the 0D N doped carbon quantum dots (N‐CQDs) is demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2 photocatalytic system. N‐CQDs are in situ loaded onto SnS2 nanosheets in forming N‐CQDs/SnS2 composite via an electrostatic interaction under hydrothermal conditions. Cr(VI) photoreduction rate of N‐CQDs/SnS2 is highly enhanced by engineering the loading contents of N‐CQDs, in which the optimal N‐CQDs/SnS2 with 40 mol% N‐CQDs exhibits a remarkable Cr(VI) photoreduction rate of 0.148 min−1, about 5‐time and 148‐time higher than that of SnS2 and N‐CQDs, respectively. Examining the photoexcited charges via zeta potential, X‐ray photoelectron spectroscopy (XPS), surface photovoltage, and electrochemical impedance spectra indicate that the improved Cr(VI) photodegradation rate is linked to the strong electrostatic attraction between N‐CQDs and SnS2 nanosheets in composite, which favors efficient carrier utilization. To further boost the carrier utilization, 4‐nitrophenol is introduced in this photocatalytic system and the efficiency of Cr(VI) photoreduction is further promoted.

Published in: "Small".

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

2019-02-06T12:36:59+00:00February 6th, 2019|Categories: Publications|Tags: , , |

Few‐layered SnS2 nanosheets vertically alligned on reduced graphene oxide nanosheets are demonstrated as high‐performance anode material for potassium‐ion batteries. Besides the high specific capacities based on sequential conversion and alloying reactions, excellent rate capability and cycling stability are also achieved by enhanced surface charge storage, fast electron/ionic transportation, and improved structural stability, benifiting from the subtle structure engineering. Abstract Anodes involving conversion and alloying reaction mechanisms are attractive for potassium‐ion batteries (PIBs) due to their high theoretical capacities. However, serious volume change and metal aggregation upon potassiation/depotassiation usually cause poor electrochemical performance. Herein, few‐layered SnS2 nanosheets supported on reduced graphene oxide ([email protected]) are fabricated and investigated as anode material for PIBs, showing high specific capacity (448 mAh g−1 at 0.05 A g−1), high rate capability (247 mAh g−1 at 1 A g−1), and improved cycle performance (73% capacity retention after 300 cycles). In this composite electrode, SnS2 nanosheets undergo sequential conversion (SnS2 to Sn) and alloying (Sn to K4Sn23, KSn) reactions during potassiation/depotassiation, giving rise to a high specific capacity. Meanwhile, the hybrid ultrathin nanosheets enable fast K storage kinetics and excellent structure integrity because of fast electron/ionic transportation, surface capacitive‐dominated charge storage mechanism, and effective accommodation for volume variation. This work demonstrates that K storage performance of alloy and conversion‐based anodes can be remarkably promoted by subtle structure engineering.

Published in: "Small".

Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole‐Derived N/S Dual‐Doped Carbon for Boosting High‐Performance Sodium Storage

2019-02-04T00:36:00+00:00February 3rd, 2019|Categories: Publications|Tags: , |

Unique synergistical coupling interconnected ZnS/SnS2 nanoboxes with N/S dual‐doped carbon are rationally designed and used as sodium‐ion battery anode material with excellent capacity retention and superior long‐term cycling stability, and the synergistical coupling constructed strategy may have further applicability for other relevant electrode materials in energy storage. Abstract Metal sulfides possess tremendous potentials owing to their high specific capacity for sodium storage. However, the huge volume expansion, accompanied with structural collapse and unsatisfied electric conductivity upon continuous cycling, always lead to inferior rate capability and severe cycling fading. In this work, binary metal sulfide (ZnS/SnS2) nanoboxes confined in N/S dual‐doped carbon shell ([email protected]) are fabricated through a facile co‐precipitation method involving the wrapping of polypyrrole, and subsequent in situ sulfidation process. Such a well‐designed heterogeneity between ZnS and SnS2 provides rapid Na+ insertion and enhanced charge transport by creating an electric field at the heterointerface. More significantly, the formation of polypyrrole‐derived N/S dual‐doped carbon is synergistically coupled with the ZnS/SnS2 to create a unique and robust architecture, further strengthening the interconnect function at the heterointerface, which improves electric/ion transfer and mitigates the volume variation during the long‐term cycling process. Herein, this as‐prepared [email protected] exhibits satisfied specific capacity, excellent rate property, and superior cyclic stability (a reversible capacity of 456.2 mAh g−1 with excellent capacity retention of 97.2% after 700 stable cycles at ultrahigh rate of 5 A g−1). The boosted Na‐storage properties demonstrate that the optimized strategy of structure‐engineering has a broad prospect to promote energy storage applications.

Published in: "Small".

20% Efficient Perovskite Solar Cells with 2D Electron Transporting Layer

2019-01-27T16:32:28+00:00January 27th, 2019|Categories: Publications|Tags: |

Large‐scaled sheet structured 2D multilayer SnS2 triggers heterogeneous nucleation over the perovskite precursor film, bringing in balanced electron and hole transport at interfaces between electron transporting layers/perovskite and perovskite/hole transporting layer, and suppressing interfacial charge recombination, achieving the highest 20.12% power conversion efficiency that has so far been reported for perovskite solar cells using a 2D electron transporting layer. Abstract Herein, a 2D SnS2 electron transporting layer is reported via self‐assembly stacking deposition for highly efficient planar perovskite solar cells, achieving over 20% power conversion efficiency under AM 1.5 G 100 mW cm−2 light illumination. To the best of the authors’ knowledge, this represents the highest efficiency that has so far been reported for perovskite solar cells using a 2D electron transporting layer. The large‐scaled 2D multilayer SnS2 sheet structure triggers a heterogeneous nucleation over the perovskite precursor film. The intermolecular Pb⋅⋅⋅S interactions between perovskite and SnS2 could passivate the interfacial trap states, which suppress charge recombination and thus facilitate electron extraction for balanced charge transport at interfaces between electron transporting layer/perovskite and hole transporting layer/perovskite. This work demonstrates that 2D materials have great potential for high‐performance perovskite solar cells.

Published in: "Advanced Functional Materials".

Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole‐Derived N/S Dual‐Doped Carbon for Boosting High‐Performance Sodium Storage

2019-01-26T22:34:24+00:00January 26th, 2019|Categories: Publications|Tags: , |

Unique synergistical coupling interconnected ZnS/SnS2 nanoboxes with N/S dual‐doped carbon are rationally designed and used as sodium‐ion battery anode material with excellent capacity retention and superior long‐term cycling stability, and the synergistical coupling constructed strategy may have further applicability for other relevant electrode materials in energy storage. Abstract Metal sulfides possess tremendous potentials owing to their high specific capacity for sodium storage. However, the huge volume expansion, accompanied with structural collapse and unsatisfied electric conductivity upon continuous cycling, always lead to inferior rate capability and severe cycling fading. In this work, binary metal sulfide (ZnS/SnS2) nanoboxes confined in N/S dual‐doped carbon shell ([email protected]) are fabricated through a facile co‐precipitation method involving the wrapping of polypyrrole, and subsequent in situ sulfidation process. Such a well‐designed heterogeneity between ZnS and SnS2 provides rapid Na+ insertion and enhanced charge transport by creating an electric field at the heterointerface. More significantly, the formation of polypyrrole‐derived N/S dual‐doped carbon is synergistically coupled with the ZnS/SnS2 to create a unique and robust architecture, further strengthening the interconnect function at the heterointerface, which improves electric/ion transfer and mitigates the volume variation during the long‐term cycling process. Herein, this as‐prepared [email protected] exhibits satisfied specific capacity, excellent rate property, and superior cyclic stability (a reversible capacity of 456.2 mAh g−1 with excellent capacity retention of 97.2% after 700 stable cycles at ultrahigh rate of 5 A g−1). The boosted Na‐storage properties demonstrate that the optimized strategy of structure‐engineering has a broad prospect to promote energy storage applications.

Published in: "Small".

Synergistical Coupling Interconnected ZnS/SnS2 Nanoboxes with Polypyrrole‐Derived N/S Dual‐Doped Carbon for Boosting High‐Performance Sodium Storage

2019-01-24T10:47:52+00:00January 24th, 2019|Categories: Publications|Tags: , |

Unique synergistical coupling interconnected ZnS/SnS2 nanoboxes with N/S dual‐doped carbon are rationally designed and used as sodium‐ion battery anode material with excellent capacity retention and superior long‐term cycling stability, and the synergistical coupling constructed strategy may have further applicability for other relevant electrode materials in energy storage. Abstract Metal sulfides possess tremendous potentials owing to their high specific capacity for sodium storage. However, the huge volume expansion, accompanied with structural collapse and unsatisfied electric conductivity upon continuous cycling, always lead to inferior rate capability and severe cycling fading. In this work, binary metal sulfide (ZnS/SnS2) nanoboxes confined in N/S dual‐doped carbon shell ([email protected]) are fabricated through a facile co‐precipitation method involving the wrapping of polypyrrole, and subsequent in situ sulfidation process. Such a well‐designed heterogeneity between ZnS and SnS2 provides rapid Na+ insertion and enhanced charge transport by creating an electric field at the heterointerface. More significantly, the formation of polypyrrole‐derived N/S dual‐doped carbon is synergistically coupled with the ZnS/SnS2 to create a unique and robust architecture, further strengthening the interconnect function at the heterointerface, which improves electric/ion transfer and mitigates the volume variation during the long‐term cycling process. Herein, this as‐prepared [email protected] exhibits satisfied specific capacity, excellent rate property, and superior cyclic stability (a reversible capacity of 456.2 mAh g−1 with excellent capacity retention of 97.2% after 700 stable cycles at ultrahigh rate of 5 A g−1). The boosted Na‐storage properties demonstrate that the optimized strategy of structure‐engineering has a broad prospect to promote energy storage applications.

Published in: "Small".

Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

2019-01-21T22:32:50+00:00January 21st, 2019|Categories: Publications|Tags: , , |

A heterogeneous nanocube‐shaped binary sulfide interlaced with S‐doped graphene is fabricated as an anode for sodium storage. Its unique heterointerfacial structure can increase reaction kinetic and maintain structural stability, resulting in ultrahigh rate capacity with ultralong life. Furthermore, the fundamental mechanism of synergistic effects for heterogeneous is demonstrated by in‐situ measurements, confirming that constructing a stable Sn/Na2S interface can effectively enhance the reversibility of the conversion reaction. Abstract Heterostructuring electrodes with multiple electroactive and inactive supporting components to simultaneously satisfy electrochemical and structural requirements has recently been identified as a viable pathway to achieve high‐capacity and durable sodium‐ion batteries (SIBs). Here, a new design of heterostructured SIB anode is reported consisting of double metal‐sulfide (SnCo)S2 nanocubes interlaced with 2D sulfur‐doped graphene (SG) nanosheets. The heterostructured (SnCo)S2/SG nanocubes exhibit an excellent rate capability (469 mAh g−1 at 10.0 A g−1) and durability (5000 cycles, 487 mAh g−1 at 5.0 A g−1, 92.6% capacity retention). In situ X‐ray diffraction reveals that the (SnCo)S2/SG anode undergoes a six‐stage Na+ storage mechanism of combined intercalation, conversion, and alloying reactions. The first‐principle density functional theory calculations suggest high concentration of p–n heterojunctions at SnS2/CoS2 interfaces responsible for the high rate performance, while in situ transmission electron microscopy unveils that the interlacing and elastic SG nanosheets play a key role in extending the cycle life.

Published in: "Advanced Functional Materials".

Cobalt‐Doped SnS2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

2019-01-21T20:33:36+00:00January 21st, 2019|Categories: Publications|Tags: |

The S/[email protected]‐SnS2 material acts as not only an effective shuttle‐suppressing shield for polysulfide but also an electrocatalyst in improving sulfur utilization and cycling stability for high‐sulfur‐loading lithium‐sulfur batteries. Therefore, it maintains 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2. Abstract The application of Li‐S batteries is hindered by low sulfur utilization and rapid capacity decay originating from slow electrochemical kinetics of polysulfide transformation to Li2S at the second discharge plateau around 2.1 V and harsh shuttling effects for high‐S‐loading cathodes. Herein, a cobalt‐doped SnS2 anchored on N‐doped carbon nanotube ([email protected]‐SnS2) substrate is rationally designed as both a polysulfide shield to mitigate the shuttling effects and an electrocatalyst to improve the interconversion kinetics from polysulfides to Li2S. As a result, high‐S‐loading cathodes are demonstrated to achieve good cycling stability with high sulfur utilization. It is shown that Co‐doping plays an important role in realizing high initial capacity and good capacity retention for Li‐S batteries. The S/[email protected]‐SnS2 cell (3 mg cm−2 sulfur loading) delivers a high initial specific capacity of 1337.1 mA h g−1 (excluding the Co‐SnS2 capacity contribution) and 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2, while the counterpart cell (S/[email protected]) only shows an initial capacity of 1074.7 and 843 mA h g−1 at the 100th cycle. The synergy effect of polysulfide confinement and catalyzed polysulfide conversion provides an effective strategy in improving the electrochemical performance for high‐sulfur‐loading Li‐S batteries.

Published in: "Advanced Functional Materials".

Cobalt‐Doped SnS2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

2019-01-21T20:33:36+00:00January 21st, 2019|Categories: Publications|Tags: |

The S/[email protected]‐SnS2 material acts as not only an effective shuttle‐suppressing shield for polysulfide but also an electrocatalyst in improving sulfur utilization and cycling stability for high‐sulfur‐loading lithium‐sulfur batteries. Therefore, it maintains 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2. Abstract The application of Li‐S batteries is hindered by low sulfur utilization and rapid capacity decay originating from slow electrochemical kinetics of polysulfide transformation to Li2S at the second discharge plateau around 2.1 V and harsh shuttling effects for high‐S‐loading cathodes. Herein, a cobalt‐doped SnS2 anchored on N‐doped carbon nanotube ([email protected]‐SnS2) substrate is rationally designed as both a polysulfide shield to mitigate the shuttling effects and an electrocatalyst to improve the interconversion kinetics from polysulfides to Li2S. As a result, high‐S‐loading cathodes are demonstrated to achieve good cycling stability with high sulfur utilization. It is shown that Co‐doping plays an important role in realizing high initial capacity and good capacity retention for Li‐S batteries. The S/[email protected]‐SnS2 cell (3 mg cm−2 sulfur loading) delivers a high initial specific capacity of 1337.1 mA h g−1 (excluding the Co‐SnS2 capacity contribution) and 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2, while the counterpart cell (S/[email protected]) only shows an initial capacity of 1074.7 and 843 mA h g−1 at the 100th cycle. The synergy effect of polysulfide confinement and catalyzed polysulfide conversion provides an effective strategy in improving the electrochemical performance for high‐sulfur‐loading Li‐S batteries.

Published in: "Advanced Functional Materials".

Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

2019-01-21T20:33:13+00:00January 21st, 2019|Categories: Publications|Tags: , , |

A heterogeneous nanocube‐shaped binary sulfide interlaced with S‐doped graphene is fabricated as an anode for sodium storage. Its unique heterointerfacial structure can increase reaction kinetic and maintain structural stability, resulting in ultrahigh rate capacity with ultralong life. Furthermore, the fundamental mechanism of synergistic effects for heterogeneous is demonstrated by in‐situ measurements, confirming that constructing a stable Sn/Na2S interface can effectively enhance the reversibility of the conversion reaction. Abstract Heterostructuring electrodes with multiple electroactive and inactive supporting components to simultaneously satisfy electrochemical and structural requirements has recently been identified as a viable pathway to achieve high‐capacity and durable sodium‐ion batteries (SIBs). Here, a new design of heterostructured SIB anode is reported consisting of double metal‐sulfide (SnCo)S2 nanocubes interlaced with 2D sulfur‐doped graphene (SG) nanosheets. The heterostructured (SnCo)S2/SG nanocubes exhibit an excellent rate capability (469 mAh g−1 at 10.0 A g−1) and durability (5000 cycles, 487 mAh g−1 at 5.0 A g−1, 92.6% capacity retention). In situ X‐ray diffraction reveals that the (SnCo)S2/SG anode undergoes a six‐stage Na+ storage mechanism of combined intercalation, conversion, and alloying reactions. The first‐principle density functional theory calculations suggest high concentration of p–n heterojunctions at SnS2/CoS2 interfaces responsible for the high rate performance, while in situ transmission electron microscopy unveils that the interlacing and elastic SG nanosheets play a key role in extending the cycle life.

Published in: "Advanced Functional Materials".

Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

2019-01-21T20:33:13+00:00January 21st, 2019|Categories: Publications|Tags: , , |

A heterogeneous nanocube‐shaped binary sulfide interlaced with S‐doped graphene is fabricated as an anode for sodium storage. Its unique heterointerfacial structure can increase reaction kinetic and maintain structural stability, resulting in ultrahigh rate capacity with ultralong life. Furthermore, the fundamental mechanism of synergistic effects for heterogeneous is demonstrated by in‐situ measurements, confirming that constructing a stable Sn/Na2S interface can effectively enhance the reversibility of the conversion reaction. Abstract Heterostructuring electrodes with multiple electroactive and inactive supporting components to simultaneously satisfy electrochemical and structural requirements has recently been identified as a viable pathway to achieve high‐capacity and durable sodium‐ion batteries (SIBs). Here, a new design of heterostructured SIB anode is reported consisting of double metal‐sulfide (SnCo)S2 nanocubes interlaced with 2D sulfur‐doped graphene (SG) nanosheets. The heterostructured (SnCo)S2/SG nanocubes exhibit an excellent rate capability (469 mAh g−1 at 10.0 A g−1) and durability (5000 cycles, 487 mAh g−1 at 5.0 A g−1, 92.6% capacity retention). In situ X‐ray diffraction reveals that the (SnCo)S2/SG anode undergoes a six‐stage Na+ storage mechanism of combined intercalation, conversion, and alloying reactions. The first‐principle density functional theory calculations suggest high concentration of p–n heterojunctions at SnS2/CoS2 interfaces responsible for the high rate performance, while in situ transmission electron microscopy unveils that the interlacing and elastic SG nanosheets play a key role in extending the cycle life.

Published in: "Advanced Functional Materials".

Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

2019-01-16T14:34:05+00:00January 16th, 2019|Categories: Publications|Tags: , , |

A heterogeneous nanocube‐shaped binary sulfide interlaced with S‐doped graphene is fabricated as an anode for sodium storage. Its unique heterointerfacial structure can increase reaction kinetic and maintain structural stability, resulting in ultrahigh rate capacity with ultralong life. Furthermore, the fundamental mechanism of synergistic effects for heterogeneous is demonstrated by in‐situ measurements, confirming that constructing a stable Sn/Na2S interface can effectively enhance the reversibility of the conversion reaction. Abstract Heterostructuring electrodes with multiple electroactive and inactive supporting components to simultaneously satisfy electrochemical and structural requirements has recently been identified as a viable pathway to achieve high‐capacity and durable sodium‐ion batteries (SIBs). Here, a new design of heterostructured SIB anode is reported consisting of double metal‐sulfide (SnCo)S2 nanocubes interlaced with 2D sulfur‐doped graphene (SG) nanosheets. The heterostructured (SnCo)S2/SG nanocubes exhibit an excellent rate capability (469 mAh g−1 at 10.0 A g−1) and durability (5000 cycles, 487 mAh g−1 at 5.0 A g−1, 92.6% capacity retention). In situ X‐ray diffraction reveals that the (SnCo)S2/SG anode undergoes a six‐stage Na+ storage mechanism of combined intercalation, conversion, and alloying reactions. The first‐principle density functional theory calculations suggest high concentration of p–n heterojunctions at SnS2/CoS2 interfaces responsible for the high rate performance, while in situ transmission electron microscopy unveils that the interlacing and elastic SG nanosheets play a key role in extending the cycle life.

Published in: "Advanced Functional Materials".

Cobalt‐Doped SnS2 with Dual Active Centers of Synergistic Absorption‐Catalysis Effect for High‐S Loading Li‐S Batteries

2019-01-13T22:31:59+00:00January 13th, 2019|Categories: Publications|Tags: |

The S/[email protected]‐SnS2 material acts as not only an effective shuttle‐suppressing shield for polysulfide but also an electrocatalyst in improving sulfur utilization and cycling stability for high‐sulfur‐loading lithium‐sulfur batteries. Therefore, it maintains 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2. Abstract The application of Li‐S batteries is hindered by low sulfur utilization and rapid capacity decay originating from slow electrochemical kinetics of polysulfide transformation to Li2S at the second discharge plateau around 2.1 V and harsh shuttling effects for high‐S‐loading cathodes. Herein, a cobalt‐doped SnS2 anchored on N‐doped carbon nanotube ([email protected]‐SnS2) substrate is rationally designed as both a polysulfide shield to mitigate the shuttling effects and an electrocatalyst to improve the interconversion kinetics from polysulfides to Li2S. As a result, high‐S‐loading cathodes are demonstrated to achieve good cycling stability with high sulfur utilization. It is shown that Co‐doping plays an important role in realizing high initial capacity and good capacity retention for Li‐S batteries. The S/[email protected]‐SnS2 cell (3 mg cm−2 sulfur loading) delivers a high initial specific capacity of 1337.1 mA h g−1 (excluding the Co‐SnS2 capacity contribution) and 1004.3 mA h g−1 after 100 cycles at a current density of 1.3 mA cm−2, while the counterpart cell (S/[email protected]) only shows an initial capacity of 1074.7 and 843 mA h g−1 at the 100th cycle. The synergy effect of polysulfide confinement and catalyzed polysulfide conversion provides an effective strategy in improving the electrochemical performance for high‐sulfur‐loading Li‐S batteries.

Published in: "Advanced Functional Materials".

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