Efficient and scalable preparation of MoS2 nanosheet/carbon nanotube composites for hydrogen evolution reaction |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Gachon University, Seongnam, Gyeonggi 13120, Republic of Korea;2. Department of Organic Material and Science, Pusan National University, Pusan 46241, Republic of Korea;1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. Beijing Key Laboratory for Powder Technology Research and Development, Beihang University, Beijing 100191, China;3. School of Chemistry, Beihang University, Beijing 100191, China;1. Department of Physics, National Institute of Technology Silchar, Silchar–788010, Assam ,India;2. Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar–788010, Assam ,India;3. Centre for Physical Sciences, Central Univeristy of Punjab, Bhatinda-151001, India;1. College of Food Science, Southwest University, Chongqing 400715, PR China;2. The University of Adelaide, School of Chemical Engineering, Adelaide, SA 5005, Australia;3. ARC Research Hub for Graphene Enabled Industry Transformation, The University of Adelaide, Adelaide, SA 5005, Australia;4. School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China;5. School of Printing and Packaging, Wuhan University, Wuhan 430072, PR China;1. The University of Queensland, Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, Brisbane, QLD 4072, Australia;2. Australian Nuclear Science & Technology Organisation, Locked Bag 2001, Kirrawee DC, Sydney, NSW 2232, Australia;3. Institute of Photovoltaics, Southwest Petroleum University, China;1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;2. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;3. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, 83 Tat Chee Avenue, Hong Kong 999077, China |
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| Abstract: | An efficient and scalable method combining ball-milling and liquid-phase exfoliation was used to prepare MoS2 nanosheets. Ammonium bicarbonate as an exfoliation aid could accelerate the delamination and pulverization of bulk MoS2 during preparation. The ball-milled MoS2 was further exfoliated by sonication (S–MoS2NS) or high-speed shear-exfoliation (H–MoS2NS) to obtain MoS2 nanosheets dispersion with high concentration. Moreover, MoS2 quantum dots were also obtained by prolonging sonication time (S–MoS2QS). Most of S–MoS2NS and H–MoS2NS have lateral dimensions less than 150 nm. The S–MoS2QS size concentrates at around 5 nm. The H–MoS2NS mixed with aminated multi-walled carbon nanotubes (MWCNT) could form H–MoS2NS/MWCNT composites with a good conductive network, and was used as a hydrogen evolution reaction (HER) catalyst. The H–MoS2NS/MWCNT composites containing 56 wt% H–MoS2NS exhibited a favorable HER activity with a low overpotential of 284 mV at 10 mA/cm2, a Tafel slope of 97 mV/dec and good stability in acid medium. |
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| Keywords: | Ball-milling Liquid-phase exfoliation Aminated multi-walled carbon nanotubes Hydrogen evolution reaction |
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