Operando X-ray photoelectron spectroscopic investigations of the electrochemical double layer at Ir/KOH(aq) interfaces

Michael F. Lichterman; Matthias H. Richter; Bruce S. Brunschwig; Nathan S Lewis; Hans Joachim Lewerenz

doi:10.1016/j.elspec.2017.03.011

Operando X-ray photoelectron spectroscopic investigations of the electrochemical double layer at Ir/KOH(aq) interfaces

Michael F. Lichterman, Matthias H. Richter, Bruce S. Brunschwig, Nathan S Lewis, Hans Joachim Lewerenz

California Institute of Technology

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

Tender X-ray operando photoemission spectroscopy has been used to directly analyze the energetics of the double layer at a metal-water interface in a dilute electrolyte having a Debye length of several nanometers. The data are compared to a theoretical evaluation of the potential of the solution near the electrode. Due to its noble nature, Ir was chosen as a working electrode material, and KOH(aq) at varied concentrations and thicknesses constituted the electrolyte. Shifts in peak width and binding energy of the water O 1s core level were analyzed by modeling based on Debye-Hückel approximations. The data are consistent with electrochemical formulations of the double layer that provide a foundation to electrochemistry.

Original language	English
Journal	Journal of Electron Spectroscopy and Related Phenomena
DOIs	https://doi.org/10.1016/j.elspec.2017.03.011
Publication status	Accepted/In press - Nov 11 2016

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Keywords

Electrochemical double layer
Operando XPS
Solid/liquid interface

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Radiation
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry

Cite this

Lichterman, M. F., Richter, M. H., Brunschwig, B. S., Lewis, N. S., & Lewerenz, H. J. (Accepted/In press). Operando X-ray photoelectron spectroscopic investigations of the electrochemical double layer at Ir/KOH(aq) interfaces. Journal of Electron Spectroscopy and Related Phenomena. https://doi.org/10.1016/j.elspec.2017.03.011

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abstract = "Tender X-ray operando photoemission spectroscopy has been used to directly analyze the energetics of the double layer at a metal-water interface in a dilute electrolyte having a Debye length of several nanometers. The data are compared to a theoretical evaluation of the potential of the solution near the electrode. Due to its noble nature, Ir was chosen as a working electrode material, and KOH(aq) at varied concentrations and thicknesses constituted the electrolyte. Shifts in peak width and binding energy of the water O 1s core level were analyzed by modeling based on Debye-H{\"u}ckel approximations. The data are consistent with electrochemical formulations of the double layer that provide a foundation to electrochemistry.",

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AU - Lewis, Nathan S

AU - Lewerenz, Hans Joachim

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10.1016/j.elspec.2017.03.011