Crucial roles of interfacial coupling and oxygen defect in multifunctional 2D inorganic nanosheets

Xiaoyan Jin, Daniel Adjei Agyeman, Saeyoung Kim, Yeon Hwa Kim, Min Gyu Kim, Yong Mook Kang, Seong Ju Hwang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An effective way to optimize the functionality of inorganic 2D nanosheets can be developed by tailoring their interfacial electronic coupling and crystal defect in the hybrid structure. The heterolayer hybridization between exfoliated Co−Fe-layered double hydroxide (LDH) and RuO2 nanosheets can provide an efficient way of optimizing the interfacial coupling and oxygen vacancy of restacked nanosheets. The obtained Co−Fe-LDH−RuO2 nanohybrid shows outstanding electrode performance for Li−O2 batteries with excellent bifunctional oxygen electrocatalytic activity, which is much superior to those of the precursor materials. In-situ X-ray absorption spectroscopic and electrochemical characterizations highlight the remarkable improvement of electrocatalysis kinetics and electrochemical stability upon hybridization, which is attributable to the intimate interfacial interaction and oxygen vacancy formation of restacked 2D inorganic nanosheets. This study underscores that a fine-control of electronic coupling and defect structure via heterolayer hybridization is quite effective in exploring high-performance bifunctional electrocatalysts applicable as Li−O2 cathode.

Original languageEnglish
Article number104192
JournalNano Energy
Volume67
DOIs
Publication statusPublished - 2020 Jan

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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