期刊
SCIENCE BULLETIN
卷 63, 期 17, 页码 1130-1140出版社
SCIENCE PRESS
DOI: 10.1016/j.scib.2018.07.008
关键词
Core-shell structure; Hydrogen evolution; Oxygen evolution; Bifunctional catalyst; Overall water splitting
资金
- National Natural Science Foundation of China [21576056, 21576057]
- Guangdong Natural Science Foundation [2017A030311016]
- Major Scientific Project of Guangdong University [2017KZDXM059]
- Science and Technology Research Project of Guangdong Province [2016A010103043]
- Science and Technology Research Project of Guangzhou [201607010232]
- Guangzhou University's 2017 Training Program for Young Top- Notch Personnel [BJ201704]
- Australian Research Council (ARC) through Discovery Early Career Researcher Award [DE150101306]
- Australian Research Council (ARC) through Linkage Project [LP160100927]
Hydrogen, serving as a clean, sustainable energy source, may be mainly produced from electrolysis water. Herein, we report cobalt disulphide encapsulated in self-catalyzed carbon nanotubes (S, N-CNTs/CoS2@Co) serving as a bifunctional catalyst, which exhibits excellent hydrogen evolution reaction performance (10.0 mA cm(-2) at 0.112 V, and low Tafel slope for 104.9 mV dec(-1)) and oxygen evolution reaction performance (10.0 mA cm(-2) at 1.57 V, and low Tafel slope for 76.1 mV dec(-1)), meanwhile with a strong stability at various current densities. In-depth study reveals that the excellent catalytic properties can be mainly attributed to the increased catalytic sites induced by S, N co-doping, the improved electronic conductivity derived from the carbon nanotubes, and Mott-Schottky effect between the metal cobalt and semiconductive cobalt disulfide. Notably, when the bifunctional catalysts are applied to overall water splitting, a low potential of 1.633 V at the current density of 10.0 mA cm(-2) is achieved, which can compete with the precious metal catalyst benchmarks in alkaline media, demonstrating its promising practicability in the realistic water splitting application. This work elucidates a practicable way to the design of transition metal and nano-carbon composite catalysts for a broad application in the fields of energy chemistry. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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