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Phase-Transition Mo1-xVxSe2 Alloy Nanosheets with Rich V-Se Vacancies and Their Enhanced Catalytic Performance of Hydrogen Evolution Reaction

Authors
Kwon, Ik SeonKwak, In HyeDebela, Tekalign TerfaKim, Ju YeonYoo, Seung JoKim, Jin-GyuPark, JeungheeKang, Hong Seok
Issue Date
28-9월-2021
Publisher
AMER CHEMICAL SOC
Keywords
(Mo,V)Se-2 alloy; hydrogen evolution reaction; phase transition; spin-plarized density functional theory; vacancies
Citation
ACS NANO, v.15, no.9, pp.14672 - 14682
Indexed
SCIE
SCOPUS
Journal Title
ACS NANO
Volume
15
Number
9
Start Page
14672
End Page
14682
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136295
DOI
10.1021/acsnano.1c04453
ISSN
1936-0851
Abstract
Alloys of transition-metal dichalcogenide can display distinctive phase evolution because of their two-dimensional structures. Herein, we report the colloidal synthesis of Mo1-xVxSe2 alloy nanosheets with full composition tuning. Alloying led to a phase transition at x = 0.7 from the semiconducting 2H phase MoSe2 to the metallic 1T phase VSe2. It also produced significant V and Se vacancies, which became the richest in the 2H phase at x = 0.3-0.5. Extensive spin-polarized density functional theory calculations consistently predicted the 2H-1T phase transition at x = 0.7, in agreement with the experimental results. The vacancy formation energy also supports the formation of V and Se vacancies. Alloying in the 2H phase enhanced the electrocatalytic performance toward hydrogen evolution reaction (HER) at x = 0.3 (in 0.5 M H2SO4) or 0.4 (in 1 M KOH). The Gibbs free energy along the HER pathway indicates that this maximum performance is due to the highest concentration of active V and Se vacancy sites.
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