SnS2

/Tag: SnS2

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".

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

2019-01-12T10:32:06+00:00January 12th, 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".

Solar-driven capacity enhancement of aqueous redox batteries with vertically-oriented tin disulfide array as both photo-cathode and battery-anode

2019-01-07T12:33:33+00:00January 7th, 2019|Categories: Publications|Tags: , |

Chem. Commun., 2019, Accepted ManuscriptDOI: 10.1039/C8CC08684B, CommunicationZhengnan Tian, Chao Li, Jingsheng Cai, Li Zhang, Lu Chen, Yingze Song, Tao Jiang, Jingyu Sun, Shixue DouAn innovative photo-enhanced aqueous redox battery (PEARB) built upon a simple two-electrode configuration is demonstrated. The synergy of the photo-cathode and battery-anode is realized by directly growing vertically-oriented SnS2 array…The content of this RSS Feed (c) The Royal Society of Chemistry

Published in: "Chemical Communications".

Photo-enhanced gas sensing of SnS2 with nanoscale defects

2019-01-02T16:32:29+00:00January 2nd, 2019|Categories: Publications|Tags: |

RSC Adv., 2019, 9,626-635DOI: 10.1039/C8RA08857H, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Wen-Jie Yan, Deng-Yun Chen, Huei-Ru Fuh, Ying-Lan Li, Duan Zhang, Huajun Liu, Gang Wu, Lei Zhang, Xiangkui Ren, Jiung Cho, Miri Choi, Byong

Published in: "RSC Advances".

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

2018-12-20T04:32:14+00:00December 20th, 2018|Categories: Publications|Tags: |

Large‐scaled sheet structured 2D multilayer SnS2 triggers a heterogeneous nucleation over the perovskite precursor film, bringing in a 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".

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

2018-12-15T22:33:56+00:00December 15th, 2018|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 high‐effective exciton dissociation originated 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".

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

2018-12-15T10:34:09+00:00December 15th, 2018|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 high‐effective exciton dissociation originated 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".

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

2018-12-08T22:32:29+00:00December 8th, 2018|Categories: Publications|Tags: |

Large‐scaled sheet structured 2D multilayer SnS2 triggers a heterogeneous nucleation over the perovskite precursor film, bringing in a 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".

Enhanced visible light absorption performance of SnS2 and SnSe2 via surface charge transfer doping

2018-12-04T10:33:31+00:00December 4th, 2018|Categories: Publications|Tags: |

RSC Adv., 2018, 8,40464-40470DOI: 10.1039/C8RA08834A, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.F. F. Xia, F. L. Yang, J. Hu, C. Z. Zheng, H. B. Yi, J. H. SunEnhanced visible light absorption performance of monolayer SnS2

Published in: "RSC Advances".

Tin disulphide/nitrogen-doped reduced graphene oxide/polyaniline ternary nanocomposites with ultra-high capacitance properties for high rate performance supercapacitor

2018-12-03T12:33:30+00:00December 3rd, 2018|Categories: Publications|Tags: , , , |

RSC Adv., 2018, 8,40252-40260DOI: 10.1039/C8RA08877B, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Zichen Xu, Zhiqiang Zhang, Leilei Gao, Hongtao Lin, Li Xue, Ziyan Zhou, Jin Zhou, Shuping ZhuoIn this work, SnS2/NRGO/PANI ternary composites are synthesized

Published in: "RSC Advances".

Finding a junction partner for candidate solar cell absorbers enargite and bournonite from electronic band and lattice matching. (arXiv:1810.13219v1 [cond-mat.mtrl-sci])

2018-11-01T02:29:20+00:00November 1st, 2018|Categories: Publications|Tags: |

An essential step in the development of a new photovoltaic (PV) technology is choosing appropriate electron and hole extraction layers to make an efficient device. We recently proposed the minerals enargite (enargite) and bournonite (bournonite) as materials that are chemically stable with desirable optoelectronic properties for use as the absorber layer in a thin-film PV device. For these compounds, spontaneous lattice polarization with internal electric fields — and potential ferroelectricity — may allow for enhanced carrier separation and novel photophysical effects. In this work, we calculate the ionization potentials for non-polar surface terminations and propose suitable partners for forming solar cell heterojunctions by matching the electronic band edges to a set of candidate electrical contact materials. We then further screen these candidates by matching the lattice constants and identify those that are likely to minimise strain and achieve epitaxy. This two-step screening procedure identified a range of unconventional candidate contact materials including SnS2, ZnTe, WO3, and Bi2O3.

Published in: "arXiv Material Science".

Two-dimensional hybrid composites of SnS2 with graphene and graphene oxide for improving sodium storage: A first-principles study. (arXiv:1810.07864v1 [cond-mat.mtrl-sci])

2018-10-19T02:29:19+00:00October 19th, 2018|Categories: Publications|Tags: , , , |

Among the recent achievements of sodium-ion battery (SIB) electrode materials, hybridization of two-dimentional (2D) materials is one of the most interesting appointments. In this work, we propose to use the 2D hybrid composites of SnS2 with graphene or graphene oxide (GO) layers as SIB anode, based on the first-principles calculations of their atomic structures, sodium intercalation energetics and electronic properties. The calculations reveal that graphene or GO film can effectively support not only the stable formation of hetero-interface with the SnS2 layer but also the easy intercalation of sodium atom with low migration energy and acceptable low volume change. The electronic charge density differences and the local density of state indicate that the electrons are transferred from the graphene or GO layer to the SnS2 layer, facilitating the formation of hetero-interface and improving the electronic conductance of the semiconducting SnS2 layer. These 2D hybrid composites of SnS2/G or GO are concluded to be more promising candidates for SIB anodes compared with the individual monolayers.

Published in: "arXiv Material Science".

Realization of vertical metal semiconductor heterostructures via solution phase epitaxy

2018-09-06T10:35:00+00:00September 6th, 2018|Categories: Publications|Tags: , |

Realization of vertical metal semiconductor heterostructures via solution phase epitaxyRealization of vertical metal semiconductor heterostructures via solution phase epitaxy, Published online: 06 September 2018; doi:10.1038/s41467-018-06053-zControlling the composition and crystal phase of layered heterostructures is important. Here, the authors report the liquid-phase epitaxial growth of Sn0.5W0.5S2 nanosheets with 83% metallic phase on SnS2 nanoplates, which are used as 100 ppb level chemiresistive gas sensors at room temperature.

Published in: "Nature Communications".

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