Stoichiometry design in hierarchical CoNiFe phosphide for highly efficient water oxidation.
Sci China Mater
; 65(10): 2685-2693, 2022.
Article
em En
| MEDLINE
| ID: mdl-35668742
ABSTRACT
Rational composition design of trimetallic phosphide catalysts is of significant importance for enhanced surface reaction and efficient catalytic performance. Herein, hierarchical Co x Ni y Fe z P with precise control of stoichiometric metallic elements (xyz = (1-10)(1-10)1) has been synthesized, and Co1.3Ni0.5Fe0.2P, as the most optimal composition, exhibits remarkable catalytic activity (η = 320 mV at 10 mA cm-2) and long-term stability (ignorable decrease after 10 h continuous test at the current density of 10 mA cm-2) toward oxygen evolution reaction (OER). It is found that the surface P in Co1.3Ni0.5Fe0.2P was replaced by O under the OER process. The density function theory calculations before and after long-term stability tests suggest the clear increasing of the density of states near the Fermi level of Co1.3Ni0.5Fe0.2P/Co1.3Ni0.5Fe0.2O, which could enhance the OH- adsorption of our electrocatalysts and the corresponding OER performance. Electronic Supplementary Material:
Supplementary material is available in the online version of this article at 10.1007/s40843-022-2061-x.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Sci China Mater
Ano de publicação:
2022
Tipo de documento:
Article