BROWSE

Related Scientist

Researcher

나노 구조 물리 연구단
나노구조물리 연구단
more info

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

Cited 0 time in webofscience Cited 0 time in scopus
117 Viewed 19 Downloaded
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
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
ISSN
1614-6832
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
Anion–Cation Double_Advanced Energy Materials_Hyoyoung Lee.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse