In Situ Spectroscopic Investigations of Electrochemical Oxygen Reduction and Evolution Reactions in Cyclic Carbonate Electrolyte Solutions

Qiling Peng, Yu Qiao, Koki Kannari, Aimin Ge, Ken Ichi Inoue, Shen Ye

研究成果: ジャーナルへの寄稿学術論文査読

15 被引用数 (Scopus)

抄録

The stability of the electrolyte solution toward superoxide radical ions (O2-) presents a particular challenge to the development of lithium-oxygen (Li-O2) batteries. Electrochemical oxygen reduction and evolution reactions (ORR/OER) on the surfaces of two electrodes, a gold electrode and a well-defined graphene electrode, in cyclic carbonate solvents of propylene carbonate (PC) and ethylene carbonate (EC), have been systematically investigated using electrochemistry in combination with sum frequency generation (SFG) vibrational spectroscopy, surface-enhanced Raman scattering (SERS), and UV-vis absorption spectroscopy, in comparison with the typical aprotic solvent dimethyl sulfoxide (DMSO), under in situ conditions. These measurements demonstrated that the cyclic carbonate solvents are unstable during the ORR. Neither O2- nor lithium peroxide (Li2O2) was found in these carbonate solutions during the ORR. Several ORR products of peroxodicarbonate (C2O62-) and lithium carbonate (Li2CO3) were observed on the electrode surface in the PC-based electrolyte solution, depending on whether or not the Li ion is included in the solution. The present comprehensive spectroscopic characterizations provide essential information for the reaction mechanism between the cyclic carbonates and O2- during the ORR.

本文言語英語
ページ(範囲)15781-15792
ページ数12
ジャーナルJournal of Physical Chemistry C
124
29
DOI
出版ステータス出版済み - 2020 7月 23

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