Origin of the Overpotential for the Oxygen Evolution Reaction on a Well-Defined Graphene Electrode Probed by in Situ Sum Frequency Generation Vibrational Spectroscopy

Qiling Peng, Jiafeng Chen, Hengxing Ji, Akihiro Morita, Shen Ye

研究成果: Article査読

35 被引用数 (Scopus)

抄録

To develop an efficient material for the cathode of the lithium-oxygen (Li-O 2 ) secondary battery, the oxygen reduction and evolution reactions (ORR and OER) on a well-defined graphene electrode have been investigated in a typical organic solvent, dimethyl sulfoxide (DMSO). The adsorption and desorption behaviors of the solvents on the graphene electrode surface were evaluated by an intrinsically surface-selective vibrational spectroscopy of sum frequency generation (SFG) during the ORR and OER. After the initial ORR depositing lithium peroxide (Li 2 O 2 ) on the graphene electrode surface in a LiClO 4 /DMSO solution, the SFG spectroscopy revealed that the subsequent OER oxidizing the Li 2 O 2 preferentially proceeds at the interface between the Li 2 O 2 and graphene rather than that between the Li 2 O 2 and bulk solution. Therefore, the OER tends to reduce the electric conductivity between the Li 2 O 2 and graphene by decreasing their contact area before a large part of the deposited Li 2 O 2 was oxidized, which elucidates the origin of the high overpotential for the OER.

本文言語English
ページ(範囲)15568-15571
ページ数4
ジャーナルJournal of the American Chemical Society
140
46
DOI
出版ステータスPublished - 2018 11 21

ASJC Scopus subject areas

  • 触媒
  • 化学 (全般)
  • 生化学
  • コロイド化学および表面化学

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