Hexagonal CoSe2 nanosheets stabilized by nitrogen-doped reduced graphene oxide for efficient hydrogen evolution reaction |
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| Affiliation: | 1. MIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150001, China;2. Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK, 8000, Aarhus C, Denmark;3. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;4. Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou 310013, China;3. Guangdong Provincial Key Laboratory of Advance Energy Storage Materials, South China University of Technology, Guangzhou, 510640, China;1. College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China;2. College of Nature Resources, Department of Forest Biomaterials, North Carolina State University, 27695, Faucette Dr, Raleigh, USA;3. Division of Environmental Engineering Science Faculty of Science and Technology, Gunma University, Kiryu, Japan;4. Dalian Chivy Biotechnology Co. Ltd., Dalian, 116000, China;1. School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minzu University, Yinchuan, 750021, PR China;2. Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, PR China;3. Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022, China;2. School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China;1. Eskisehir Technical University, Faculty of Science, Department of Physics, Yunusemre Campus, 26470 Tepebasi, Eskisehir, Turkey;2. Central Research Laboratory, Eskisehir Osmangazi University, Eskisehir, Turkey |
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| Abstract: | CoSe2 is considered as a promising candidate among non-noble metal electrocatalysts for the hydrogen evolution reaction (HER) due to its intrinsic metallicity and low Gibbs free energy for hydrogen adsorption. Recently, the hexagonal CoSe2 becoming increasingly popular owing to its chemically favorable basal plane, which provides more active sites, but remains limited by the poor stability. In this study, we design a small-molecule-amine-assisted hydrothermal method to in situ anchor the hexagonal CoSe2 nanosheets (NSs) on nitrogen-doped reduced graphene oxides (RGO) as an advanced electrode material for HER. Due to the existence of abundant functional groups and high specific surface area of RGO, the hexagonal CoSe2 NSs could be stably formed on RGO. As a result, only a small overpotential of 172 mV is needed for the optimized sample to drive a current density of 10 mA cm−2 in 0.5 M H2SO4 and the Tafel slope is 35.2 mV dec−1, which is comparable with the state-of-the-art Pt catalyst (32.3 mV dec−1). Therefore, the facile and low-cost method for synthesizing hexagonal TMDs with robust electrical and chemical coupling developed in this work is promising in promoting the large-scale application of non-precious electrocatalysts. |
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| Keywords: | Nitrogen-doped graphene Hydrogen evolution reaction Electrical and chemical coupling |
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