Synthesis of flower-like cobalt, nickel phosphates grown on the surface of porous high entropy alloy for efficient oxygen evolution

被引：32

作者：

Tang, J. ^{[1
]}

Xu, J. L. ^{[1
]}

Ye, Z. G. ^{[1
]}

Ma, Y. C. ^{[1
]}

Li, X. B. ^{[1
]}

Luo, J. M. ^{[1
]}

Huang, Y. Z. ^{[2
]}

机构：

[1] Nanchang Hangkong Univ, Sch Mat Sci & Engn, Nanchang 330063, Jiangxi, Peoples R China

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 885卷

基金：

中国国家自然科学基金;

关键词：

High entropy alloys; CoCrFeNiMo; Oxygen evolution reaction; Water splitting; Microwave sintering; Hydrothermal treatment; WATER OXIDATION; ELECTROCATALYST; NANOPARTICLES; COOOH; ARRAY; PURE;

D O I：

10.1016/j.jallcom.2021.160995

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：8