Synergistic Effect of CuGeO3/Graphene Composites for Efficient Oxygen–Electrode Electrocatalysts in Li–O2 Batteries

Gwang Hee Lee, Myung Chang Sung, Jae Chan Kim, Hee Jo Song, Dong-Wan Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Hybridized 1D/2D CuGeO3/graphene composites are applied as the oxygen–electrode electrocatalysts for Li–O2 batteries. The CuGeO3/graphene composites are synthesized by the crystallographic alignment of CuGeO3 nanowires on graphene, rendering strong heteroepitaxial coupling between the 1D oxide nanostructures and the 2D electrically conducting graphene. The inherited excellent electrocatalytic activity of the CuGeO3/graphene composites leads to lower overpotentials and more stable cycling performance of Li–O2 cells than CuGeO3 nanowires and graphene. The relationships between CuGeO3 nanowires and graphene are studied for the oxygen reduction and oxygen evolution activity in both aqueous and nonaqueous solutions, and the electrocatalytic activity is improved by manipulating the redox pair and sp3/sp2 via surface chemical modification.

Original languageEnglish
Article number1801930
JournalAdvanced Energy Materials
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Keywords

  • bifunctional phase boundary
  • CuGeO
  • graphene
  • Li–O batteries
  • synergistic effect

ASJC Scopus subject areas

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

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