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Anion-Cation Double Substitution in Transition Metal Dichalcogenide to Accelerate Water Dissociation Kinetic for Electrocatalysis

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Title
Anion-Cation Double Substitution in Transition Metal Dichalcogenide to Accelerate Water Dissociation Kinetic for Electrocatalysis
Author(s)
Ngoc Quang Tran; Viet Q. Bui; Hung M. Le; Yoshiyuki Kawazoe; Hyoyoung Lee
Subject
codoping, ; electrocatalysts, ; hydrogen evolution reaction, ; synergistic effect, ; vanadium-cobalt phosphosulphide
Publication Date
2018-05
Journal
ADVANCED ENERGY MATERIALS, v.8, no.15, pp.1702139
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Until now, many works have shown that the hydrogen evolution reaction (HER) performance can be improved by anion or cation substitution into the crystal lattice of pyrite-structure materials. However, the synergistic effects of anion-cation double substitution for overall enhancement of the catalytic activity remains questionable. Here, the simultaneous incorporation of vanadium and phosphorus into the CoS2 moiety for preparing 3D mesoporous cubic pyrite-metal Co1-xVxSP is presented. It is demonstrated that the higher catalytic activity of CoS2 after V incorporation can be primarily attributed to abundance active sites, whereas P substitution is responsible for improving HER kinetics and intrinsic catalyst. Interestingly, due to the synergistic effect of P-V double substitution, the 3D Co1-xVxSP shows superior electrocatalysis toward the HER with a very small overpotential of 55 mV at 10 mA cm(-2), a small Tafel slope of 50 mV dec(-1), and a high turnover frequency of 0.45 H-2 s(-1) at 10 mA cm(-2), which is very close to commercial 20% Pt/C. Density functional theory calculation reveals that the superior catalytic activity of the 3D Co1-xVxSP is contributed by the reduced kinetic energy barrier of rate-determining HER step as well as the promotion of the desorption H-2 gas process
URI
https://pr.ibs.re.kr/handle/8788114/4505
DOI
10.1002/aenm.201702139
ISSN
1614-6832
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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