Chen J, Ying J, Xiao Y, Dong Y, Ozoemena KI, Lenaerts S, Yang X. Stoichiometry design in hierarchical CoNiFe phosphide for highly efficient water oxidation.
SCIENCE CHINA MATERIALS 2022;
65:2685-2693. [PMID:
35668742 PMCID:
PMC9136762 DOI:
10.1007/s40843-022-2061-x]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 04/01/2022] [Indexed: 06/15/2023]
Abstract
UNLABELLED
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 (x:y:z = (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.
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