Complementary combinative strategy of defect engineering and graphene coupling for efficient energy-functional materials
- 주제(키워드) defect engineering , amorphous nanocrystal , graphene , hydrogen evolution electrocatalyst , sodium ion batteries
- 주제(기타) Chemistry, Multidisciplinary
- 설명문(일반) [Kim, Minji; Kim, Myung Hwa] Ewha Womans Univ, Coll Nat Sci, Dept Chem & Nanosci, Seoul 03760, South Korea; [Park, Yeon Hu; Jin, Xiaoyan; Hwang, Seong-Ju] Yonsei Univ, Coll Engn, Dept Mat Sci & Engn, Seoul 03722, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 WILEY-V C H VERLAG GMBH
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000191127
- 본문언어 영어
- Published As https://doi.org/10.1002/asia.202101013
- PubMed https://pubmed.ncbi.nlm.nih.gov/34585836
초록/요약
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.
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