CoCrFeNi High-Entropy Alloy as an Enhanced Hydrogen Evolution Catalyst in an Acidic Solution

被引：44

作者：

McKay, Frank ^{[1
]}

Fang, Yuxin ^{[2
]}

Kizilkaya, Orhan ^{[3
]}

Singh, Prashant ^{[4
]}

Johnson, Duane D. ^{[4
,5
]}

Roy, Amitava ^{[3
]}

Young, David P. ^{[1
]}

Sprunger, Phillip T. ^{[1
]}

Flake, John C. ^{[2
]}

Shelton, William A. ^{[2
]}

Xu, Ye ^{[2
]}

机构：

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[2] Louisiana State Univ, Cain Dept Chem Engn, Baton Rouge, LA 70803 USA

[3] Louisiana State Univ, Ctr Adv Microstruct & Devices, Baton Rouge, LA 70803 USA

[4] US DOE, Ames Lab, Ames, IA 50011 USA

[5] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2021年 / 125卷 / 31期

基金：

美国国家科学基金会;

关键词：

OXYGEN REDUCTION; STABLE ELECTROCATALYST; ELECTROLYTIC HYDROGEN; MOLECULAR ADSORPTION; H-2; EVOLUTION; TOTAL-ENERGY; EFFICIENT; NICKEL; CO; NANOPARTICLES;

D O I：

10.1021/acs.jpcc.1c03646

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：

High-entropy alloys (HEAs) have intriguing material properties, but their potential as catalysts has not been widely explored. Based on a concise theoretical model, we predict that the surface of a quaternary HEA of base metals, CoCrFeNi, should go from being nearly fully oxidized except for pure Ni sites when exposed to O-2 to being partially oxidized in an acidic solution under cathodic bias, and that such a partially oxidized surface should be more active for the electrochemical hydrogen evolution reaction (HER) in acidic solutions than all the component metals. These predictions are confirmed by electrochemical and surface science experiments: the Ni in the HEA is found to be most resistant to oxidation, and when deployed in 0.5 M H2SO4, the HEA exhibits an overpotential of only 60 mV relative to Pt for the HER at a current density of 1 mA/cm(2).

引用

页码：17008 / 17018

页数：11

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