Liquid exfoliation graphene sheets as catalysts for hybrid sodium-air cells

Feng Liang, Takayuki Watanabe, Katsuro Hayashi, Yaochun Yao, Wenhui Ma, Yang Bin Yang, Yongnian Dai

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11 Citations (Scopus)

Abstract

Graphene sheets are prepared by subjecting pyrolytic graphite in acetone to liquid exfoliation with sonication. Pyrolytic graphite is synthesized via arc discharge method. Five-layered graphene sheets are obtained through sonication for 12 h. The synthesized graphene sheets are then used as catalysts for hybrid sodium-air cells. The electrocatalytic activity of the exfoliated graphene sheets toward oxygen reduction reaction (ORR) is higher than that of pyrolytic graphite because of numerous edges and efficient electron communication between active edge sites and electrode substrate in the former. The discharge voltage is held constant at 2.48 V versus Na/Na+ for the exfoliated graphene sheets as the catalyst at a current density of 1 mA cm−2 and room temperature.

Original languageEnglish
Pages (from-to)32-35
Number of pages4
JournalMaterials Letters
Volume187
DOIs
Publication statusPublished - Jan 15 2017

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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