Three dimensional (3D) nanostructured assembly of MoS2-WS2/Graphene as high performance electrocatalysts |
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| Affiliation: | 1. Department of Orthopedics Surgery, Changhua Christian Hospital, Chang-hua, Taiwan;2. Dept. of Mechanical Engineering, Chung Yuan Christian University, Taoyuan, Taiwan;3. R&D Center for Membrane Technology, Chung Yuan Christian University, Taoyuan, Taiwan;1. Department of Chemical and Biological Engineering, Gachon University, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea;2. National Research Facilities & Equipment center (NFEC), Korea Basic Science Institute (KBSI), 169-148, Gwahak-ro, Yuseong-gu, Daejeon, 34133, Republic of Korea;3. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea;4. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea;5. Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam;1. Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing, 210093, China;2. College of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, 210017, China |
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| Abstract: | A promising electrocatalyst material composed of 2D layered MoS2-WS2 heterostructure hierarchically assembled into a 3D highly interconnected macroporous network of graphene was facilely fabricated. This in-situ synthesis method involves hydrothermal reaction followed by moderate thermal annealing which guarantees the uniform distribution of the MoS2-WS2 heterojunctions within graphene matrix. The presence of 3D conductive and porous graphene network and the combined merits of MoS2 and WS2 endow the resulting 3D MoS2-WS2/graphene nanohybrids with unique conductivity pathways and channels for electrons and with outstanding electrocatalytic performance towards enhanced hydrogen evolution reaction (HER). This 3D nanohybrid delivered the small overpotential of 110 mV, and the small Tafel slope of 41 mV per dec, demonstrating high HER activity. Furthermore, the resulting nanohybrids exhibit excellent stability as very trivial drop in the current density was noticed even after 2000 cycles. The superior electrocatalytic performance of 3D MoS2-WS2/graphene over other non-precious metal electrocatalysts is accredited to the robust synergism of 2D MoS2-WS2 with 3D graphene that offer ample active sites and improved conductivity for HER. The proposed approach can be further extended to modify other layered transition metal dichalcogenides with hierarchical 3D porous structure as a competent electrocatalysts for HER. |
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| Keywords: | 3D assembly Nanostructured hybrids Electrocatalysts Hydrogen evolution reaction Graphene |
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