In-situ/operando X-ray absorption spectroscopic investigation of the electrode/electrolyte interface on the molecular scale

Li Cheng Kao, Xuefei Feng, Yang Ha, Feipeng Yang, Yi Sheng Liu, Nathan T. Hahn, James MacDougall, Weilun Chao, Wanli Yang, Kevin R. Zavadil, Jinghua Guo

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

A method for performing X-ray absorption spectroscopy (XAS) in the soft X-ray region was developed to investigate the surface-sensitive electron signal of electrode/electrolyte interfaces in common multivalent based organic solvents under in situ/operando conditions. Our approach enables us to probe the molecular-scale structure of electrode interfaces by measuring total electron yield and is suitable for redox systems exhibiting low intrinsic electrochemical current. In-situ F K-edge XAS measurements in a 0.5 M Magnesium bis(trifluoromethanesulfonimide)/2-Methyltetrahydrofuran (Mg(TFSI)2/2-MeTHF) electrolyte were carried out to determine the evolution of interfacial species during the electrochemical charging/discharging process. Time-dependent density-functional theory (TD-DFT) simulation indicate that the F K-edge evolution is the result of interfacial chemical environment change driven by electrochemical potential. In addition, we performed the “operando XAS” which runs the CV and collects spectra simultaneously. By using this method, the non-equilibrium state of condensed matter interfaces and interfacial dynamical transient process can be revealed.

原文English
文章編號121720
期刊Surface Science
702
DOIs
出版狀態Published - 2020 12月

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學

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