Ultrathin WS2 nanosheets vertically aligned on TiO2 nanobelts as efficient alkaline hydrogen evolution electrocatalyst |
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| Affiliation: | 1. Henan Engineering Research Center of Resource & Energy Recovery from Waste, Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 47504, China;2. Research Institute for Science and Technology, Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;2. College of Chemistry and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;1. School of Mechanical Engineering, Yeungnam University, Gyeongsan-si 38541, South Korea;2. Energy Storage Conversion Laboratory, Department of Electrical Engineering, Chungnam National University, Daejeon 38534, South Korea;1. Department of Chemical and Biological Engineering, Gachon University, Seongnam-si, Gyeonggi-do 13120, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;3. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea;4. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam;1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300354, China;2. State Key Laboratory of Bio-fibers and Eco-textiles, School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China |
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| Abstract: | Highly efficient and durable non-noble metal-based hydrogen evolution electrocatalysts are critical to advance the production of hydrogen energy via alkaline water electrolysis. Herein, we prepared a novel TiO2@WS2 hybrid via a facile and scalable two-step hydrothermal strategy combined with selective etching. Benefited from acid-etched TiO2 nanobelts with rough surface as substrate, ultrathin WS2 nanosheets nucleated and vertically grew into few layers in the confined configuration with more exposed active edges. Furthermore, the partial incorporation of oxygen in WS2 inherited from the remaining O–W bonds of tungsten precursor enhanced the electrical conductivity of the hybrid. Therefore, TiO2@WS2 hybrid was proved to be efficient and durable electrocatalyst for hydrogen evolution in alkaline medium. Upon optimal conditions, the hybrid only required a small onset overpotential of 95 mV and a low overpotential of 142 mV at 10 mA cm?2, superior to pristine WS2 and TiO2. In addition, better cycling stability during the alkaline HER process was also obtained, indicating its capability in future practical application. The synthesis strategy presents a cost-effective approach to produce efficient WS2-based HER electrocatalyst for electrochemical water splitting. |
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| Keywords: | Electrocatalyst Hydrogen evolution reaction Alkaline medium |
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