期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 885, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160995
关键词
High entropy alloys; CoCrFeNiMo; Oxygen evolution reaction; Water splitting; Microwave sintering; Hydrothermal treatment
资金
- National Natural Science Foundation of China [51862026]
- Natural Science Foundation of Jiangxi Province [20202ACBL214011, 20192ACBL21048]
- Aeronautical Science Foundation of China [2017ZF56027]
The research focuses on the development of cheap, efficient and high activity non-noble-metal oxygen evolution reaction (OER) electrocatalysts for water splitting applications. By growing flower-like phosphates on a porous microwave sintered CoCrFeNiMo high entropy alloy (HEA) using the hydrothermal-phosphorization method, a catalyst with excellent OER performance was obtained. The porous HEA phosphates showed low overpotential, small Tafel slope and superior stability in 1.0 M KOH, even after 5000 cyclic voltammetry (CV) tests.
The development of cheap, efficient and high activity non-noble-metal oxygen evolution reaction (OER) electrocatalysts is of great interest in promoting the application of water splitting. Herein, the flower-like phosphates were grown in situ on a porous microwave sintered CoCrFeNiMo high entropy alloy (HEA) by the hydrothermal-phosphorization method. The metal phosphates can promote the formation of hydroxides with high catalytic activity on the surface of the catalyst. The obtained porous HEA phosphates exhibit a low overpotential of 220 mV at 10 mA cm(-2), a small Tafel slope of 30.3 mV dec(-1) and superior stability in 1.0 M KOH. Especially, after continuous cyclic voltammetry (CV) 5000 cycles, the catalyst only requires the overpotential of 210 mV at 10 mA cm(-2). The enhanced OER performance of this porous HEA is be attributed to 3D internal connected nanoporous structure, high conductivity, abundant metal (oxy)hydroxide nanosheets and the presence of phosphonates, that provides a sufficiently large surface exposure and allows the acceleration of the electron transfer rate between various species. (C) 2021 Elsevier B.V. All rights reserved.
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