期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 27, 页码 13240-13250出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.02.082
关键词
Bi-functional catalysts; Transition metal carbides; Oxygen reduction reaction; Hydrogen evolution reaction
资金
- National Natural Science Foundation of China, China [11805211]
- Natural Science Foundation of Guangdong Province, China [2019A1515011006]
This study presents a in-situ simple approach to synthesize ultra small sized transition metal carbides nanoparticles coupled with nitrogen-doped carbon hybrids as catalysts, which exhibit excellent performances in oxygen reduction reaction and hydrogen evolution reaction in acidic electrolyte.
Developing non-precious metal catalysts for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is crucial for proton exchange membrane fuel cell (PEMFC), metal-air batteries and water splitting. Here, we report a in-situ simple approach to synthesize ultra small sized transition metal carbides (TMCs) nanoparticles coupled with nitrogen-doped carbon hybrids (TMCs/NC, including WC/NC, V8C7/NC and Mo2C/NC). The TMCs/NC exhibit excellent ORR and HER performances in acidic electrolyte as bi-functional catalysts. The potential of WC/NC at the current density of 3.0 mA cm(-2) for ORR is 0.814 V (vs. reversible hydrogen electrode (RHE)), which is very close to Pt/C (0.827 V), making it one of the best TMCs based ORR catalysts in acidic electrolyte. Besides, the TMCs/NC exhibit excellent performances toward HER, the Mo2C/NC only need an overpotential of 80 mV to drive the current density of 10 mA cm(-2), which is very close to Pt/C (37 mV), making it the competitive alternative candidate among the reported non-precious metal HER catalysts.(c) 2022 Hydrogen Energy Publications LLC.
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