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Low-Electronegativity Vanadium Substitution in Cobalt Carbide Induced Enhanced Electron Transfer for Efficient Overall Water Splitting

Zhang, Songge, Gao, Guohua, Hao, Jiace, Wang, Manman, Zhu, Han, Lu, Shuanglong, Duan, Fang, Dong, Weifu, Du, Mingliang and Zhao, Yunlong (2019) Low-Electronegativity Vanadium Substitution in Cobalt Carbide Induced Enhanced Electron Transfer for Efficient Overall Water Splitting ACS Applied Materials & Interfaces, 11 (46). pp. 43261-43269.

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Abstract

Developing highly efficient electrocatalysts while revealing the active site and reaction mechanism is essential for electrocatalytic water splitting. To overcome the number and location limitations of defects in the electrocatalyst induced by conventional transition-metal atom (e.g. Fe, Co, and Ni) surface doping, we report a facile strategy of substitution with lower electronegative vanadium in the cobalt carbide, leading to larger amounts of defects in the whole lattice. The self-supported and quantitatively substituted VxCo3–xC (0 ≤ x ≤ 0.80) was one-step synthesized in the electrospun carbon nanofibers (CNFs) through the solid-state reaction. Particularly, the V0.28Co2.72C/CNFs exhibit superior hydrogen evolution reaction and oxygen evolution reaction activity and deliver a current density of 10 mA cm–2 at 1.47 V as the alkaline electrolyzer, which is lower than the values for the Pt/C–Ir/C couple (1.60 V). The operando Raman spectra and density functional theory calculations show that the enhanced electron transfer from V to the orbit of the Co atom makes Co a local negative charge center and leads to a significant increase in efficiency for overall water splitting.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Zhang, Songge
Gao, Guohua
Hao, Jiace
Wang, Manmanmanman.wang@surrey.ac.uk
Zhu, Han
Lu, Shuanglong
Duan, Fang
Dong, Weifu
Du, Mingliang
Zhao, Yunlongyunlong.zhao@surrey.ac.uk
Date : 24 October 2019
Funders : University of Surrey, UK National Measurement System
DOI : 10.1021/acsami.9b16390
Copyright Disclaimer : Copyright © 2019 American Chemical Society
Uncontrolled Keywords : Materials chemistry; Electrospinning; Electron transfer; Metal substitution; Water splitting
Depositing User : Clive Harris
Date Deposited : 06 Dec 2019 09:54
Last Modified : 06 Dec 2019 09:54
URI: http://epubs.surrey.ac.uk/id/eprint/853240

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