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Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials

Title
Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials
Authors
Kim M.Park Y.H.Kim M.H.Jin X.Hwang S.-J.
Ewha Authors
김명화
SCOPUS Author ID
김명화scopus
Issue Date
2021
Journal Title
Chemistry - An Asian Journal
ISSN
1861-4728JCR Link
Citation
Chemistry - An Asian Journal vol. 16, no. 23, pp. 3937 - 3943
Keywords
amorphous nanocrystaldefect engineeringgraphenehydrogen evolution electrocatalystsodium ion batteries
Publisher
John Wiley and Sons Ltd
Indexed
SCIE; SCOPUS scopus
Document Type
Article
Abstract
The synergetic combination of defect engineering and graphene coupling enables to develop an effective way of exploring efficient bifunctional electrocatalyst/electrode materials. Defect-engineered amorphous MoO2-reduced graphene oxide (rGO) nanohybrid was synthesized by soft-chemical reduction of K2MoO4 in graphene oxide colloids. Mo K-edge X-ray absorption spectroscopy clearly demonstrates the rutile-type local atomic structure of amorphous MoO2 with significant oxygen vacancies and intimate electronic coupling with rGO. The defect-introduced MoO2-rGO nanohybrid shows excellent bifunctionality as electrocatalyst for hydrogen evolution reaction and electrode for sodium-ion batteries, which are superior to those of crystalline MoO2-rGO homologue. The beneficial effect of simultaneous defect control and rGO coupling can be ascribed to the provision of oxygen vacancies acting as active sites, the increase of electrical conductivity, and the improvement of reaction kinetics. © 2021 Wiley-VCH GmbH
DOI
10.1002/asia.202101013
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자연과학대학 > 화학·나노과학전공 > Journal papers
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