4.8 Article

Revealing the effect of anion-tuning in bimetallic chalcogenides on electrocatalytic overall water splitting

期刊

NANO RESEARCH
卷 14, 期 12, 页码 4548-4555

出版社

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3370-7

关键词

electrocatalytic overall water splitting; electronic structure; bimetallic chalcogenide; high valence Co3+; intermediates interaction

资金

  1. National Natural Science Foundation of China [21771012, 21601008]
  2. Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51621003]

向作者/读者索取更多资源

Experimental and theoretical studies demonstrate that substitution of selenium and sulfur can enhance the electronic structure and catalytic activity of NiCo2X4/CP (X = O, S, and Se), leading to a lower working voltage in alkaline electrolyzers.
Enhancing electrocatalytic water splitting performance by modulating the intrinsic electronic structure is of great importance. Here, porous bimetallic oxide and chalcogenide nanosheets grown on carbon paper denoted as NiCo2X4/CP (X = O, S, and Se) are prepared to demonstrate how the anion components affect the electronic structures and thereby disclose the correlation between their intermediates interaction and catalytic activities. The experimental characterization and theoretical calculation demonstrate that Se and S substitution can promote the ratio of Co3+/Co2+ and thereby modulate the electronic structure accompanied with the upshift of d band centers, which not only enhance the inner conductivity but also regulate the interaction between the catalyst surface and intermediates, especially for the adsorption of absorbed H and hydroperoxy intermediates towards respective hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). As a result, a full alkaline electrolyzer using NiCo2Se4/CP and NiCo2S4/CP as cathode and anode delivers a low voltage of 1.51 V at 10 mAcm(-2), which is comparable even superior to most transition metal-based electrolyzers.

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