Multilayer hybrid nanosheet of mesoporous carbon−layered metal oxide as a highly efficient electrocatalyst for Li−O2 batteries

Yun Kyung Jo, Wilson Tamakloe, Xiaoyan Jin, Joohyun Lim, Sharad B. Patil, Yong Mook Kang, Seong Ju Hwang

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

An effective methodology to explore highly efficient oxygen electrocatalysts and electrodes for Li−O2 batteries is developed via intimate layer-by-layer hybridization between mesoporous carbon layer and highly anisotropic 2D metal oxide nanosheets. The obtained multilayer hybrid nanosheets of mesoporous carbon−layered MnO2 display outstanding functionalities as oxygen electrocatalysts with low overpotential and as the electrodes of Li−O2 batteries with huge discharge capacity of ˜7000 mAhg−1 at 200 mAg1 and improved cyclability. The excellent electrocatalyst/electrode bifunctionality of the present material is attributable to enhanced electron transfer kinetics, maximized active sites, promoted electrocatalysis kinetics, and stabilization of unstable Mn3+ species. This multilayer hybrid nanosheet structure is advantageous for facilitating reversible formation/decomposition of discharged product during cycling in Li−O2 batteries via promoted electrolyte−oxygen diffusion. The present study underscores that exfoliated metal oxide nanosheet can be used as an efficient immobilization matrix for synthesizing novel 2D multilayer hybrid nanosheets with synergistically-improved electrocatalyst/electrode functionalities.

Original languageEnglish
Pages (from-to)523-530
Number of pages8
JournalApplied Catalysis B: Environmental
Volume254
DOIs
StatePublished - 5 Oct 2019

Keywords

  • Electrocatalyst
  • Li-Obatteries
  • Manganese oxide
  • Mesoporous carbon
  • Multilayer hybrid 2D nanosheet

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