Molten salt strategy to synthesize alkali metal-doped Co9S8 nanoparticles embedded,N, S co-doped mesoporous carbon as hydrogen evolution electrocatalyst |
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| Affiliation: | 1. Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, 110034, PR China;2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China;3. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, PR China;1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou city, Guangdong province, 510641, China;2. Guangdong Key Laboratory of Fuel Cell Technology, Guangzhou 510641, China;3. Department of Environmental Monitoring, Guangdong Polytechnic of Environmental Protection Engineering, Foshan, 528216, China;1. Key Laboratory of Colloid and Interface Chemistry, Ministry of Education School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China;2. School of Material Science and Engineering, Shandong University Jinan 250061, PR China;3. Hefei National Laboratory for Physical Science at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China;1. State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China;2. College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing, 314001, China;3. South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town, 7535, South Africa |
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| Abstract: | A molten salt strategy was proposed to prepare a series of electrocatalysts for hydrogen evolution reaction (HER) with salts as templates, which consisted of Co9S8 nanoparticles (NPs) and N, S co-doped mesoporous carbons. The porosities, heteroatoms contents, and crystalline structures of the final electrocatalysts were determined by the types of salts and the calcining temperatures. When KCl/NaCl, KCl/LiCl, and NaCl/CaCl2 were adopted as the molten salts, Co9S8 NPs embedded, N, S co-doped carbons were obtained. However, when CaCl2 and ZnCl2 were used as the molten salts, Co9S8 could not be synthesized. The characterization results exhibited that alkali metal atoms could be introduced in the lattices of Co9S8. The combination of experimental and theoretical results revealed that Na and K atoms doping improved the electrocatalytic performance for HER. GTCo900-KCl/NaCl possessed the best HER activity, delivering a current density of 10 mA cm−2 at 54 mV in acidic media, 142 mV in neutral media, and 103 mV in alkaline media. |
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| Keywords: | Molten salts Mesoporous materials Alkali metal doping N, S co-doped carbon Hydrogen evolution reaction |
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