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

Minji Kim, Yeon Hu Park, Myung Hwa Kim, Xiaoyan Jin, Seong Ju Hwang

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)3937-3943
Number of pages7
JournalChemistry - An Asian Journal
Volume16
Issue number23
DOIs
StatePublished - 1 Dec 2021

Keywords

  • amorphous nanocrystal
  • defect engineering
  • graphene
  • hydrogen evolution electrocatalyst
  • sodium ion batteries

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