Driven by the strong adsorptive and catalytic ability of metal sulfides for soluble polysulfides, it is considered as a potential mediator to resolve the problems of shuttle effect and slow reaction kinetics of polysulfides in lithium-sulfur (Li-S) batteries. However, their further development is limited by poor electrical conductivity and bad long-term durability. Herein, one type of new catalyst composed of SnS/SnS heterostructures on hierarchical porous carbon (denoted as SnS/SnS-HPC) by a simple hydrothermal method is reported and used as an interlayer coating on the conventional separator for blocking polysulfides. The SnS/SnS-HPC integrates the advantages of a porous conductive network for promoting the transport of electrons and an enhanced electrocatalyst for accelerating polysulfides conversion. As a result, such a cell coupled with a SnS/SnS-HPC interlayer exhibits a long-term lifespan of 1200 cycles. This work provides a new cell configuration by using heterostructures with a built-in electric field formed from a p-n heterojunction to improve the performance of Li-S batteries.
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SnS/SnS Heterostructures Embedded in Hierarchical Porous Carbon as Polysulfides Immobilizer for High-Performance Lithium-Sulfur Batteries.
Langmuir
March 2024
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Jiangsu 210093, China.
Driven by the strong adsorptive and catalytic ability of metal sulfides for soluble polysulfides, it is considered as a potential mediator to resolve the problems of shuttle effect and slow reaction kinetics of polysulfides in lithium-sulfur (Li-S) batteries. However, their further development is limited by poor electrical conductivity and bad long-term durability. Herein, one type of new catalyst composed of SnS/SnS heterostructures on hierarchical porous carbon (denoted as SnS/SnS-HPC) by a simple hydrothermal method is reported and used as an interlayer coating on the conventional separator for blocking polysulfides.
View Article and Find Full Text PDFEnhanced Optical Response of SnS/SnS Layered Heterostructure.
Sensors (Basel)
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Department of Materials Science and Engineering, National Chung Hsing University, No. 145, Xingda Rd., South Dist., Taichung 402, Taiwan.
The SnS/SnS heterostructure was fabricated by the chemical vapor deposition method. The crystal structure properties of SnS and SnS were characterized by X-ray diffraction (XRD) pattern, Raman spectroscopy, and field emission scanning electron microscopy (FESEM). The frequency dependence photoconductivity explores its carrier kinetic decay process.
View Article and Find Full Text PDFVertical 2-dimensional heterostructure SnS-SnS with built-in electric field on rGO to accelerate charge transfer and improve the shuttle effect of polysulfides.
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Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China; National and Local Joint Engineering Research Center of Key Materials and Technologies for High Energy and Safety Batteries, Engineering Research Center of MTEES (Ministry of Education), South China Normal University, Guangzhou 510006, China; fSCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan 511517, China. Electronic address:
Traditional carbon materials as sulfur hosts of Li-sulfur(Li-S) cathodes have slightly physical constraint for polysulfides, due to their no-polar property. Therefore, it is necessary to further enhance the affinity between sulfur hosts and polysulfides, and relieve the shuttle effects in the Li- S batteries. Herein, we report a novel vertical 2-dimensional (2D) p-SnS/n-SnS heterostructure sheets which grown on the surface of rGO.
View Article and Find Full Text PDFEfficacious CO Photoconversion to C2 and C3 Hydrocarbons on Upright SnS-SnS Heterojunction Nanosheet Frameworks.
ACS Appl Mater Interfaces
February 2021
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.
In this work, SnS-SnS heterostructured upright nanosheet frameworks are constructed on FTO substrates, which demonstrate promising photocatalytic performances for the conversion of CO and water to C2 (acetaldehyde) and C3 (acetone) hydrocarbons without H formation. With post annealing in designated atmospheres, the photocatalytic activity of the SnS-SnS heterostructured nanosheet framework is critically enhanced by increasing the fraction of crystalline SnS in nanosheets through partial transformation of the SnS matrix to SnS but not obviously influenced by improving the crystallinity of the SnS matrix. DFT calculations indicate that transformed SnS possesses the CO adsorption sites with significantly lower activation energy for the rate-determining step to drive efficient CO conversion catalysis.
View Article and Find Full Text PDFRemarkably efficient charge transfer through a double heterojunction mechanism by a CdS-SnS-SnS/rGO composite with excellent photocatalytic performance under visible light.
J Hazard Mater
June 2020
School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, PR China.
In this work, a novel CdS-SnS-SnS/rGO photocatalyst with two tin valence states (Ⅱ and IV) was successfully synthesized by a one-pot solvothermal method. For comparison, CdS-SnS/rGO (GCS2) with tin in only the IV valence state was made by the same method. Based on a series of characterizations, CdS, SnS and SnS were shown to be successfully loaded onto the rGO surface.
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