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 › peer-review

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
Pages (from-to)	99-105
Number of pages	7
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	221
DOIs	https://doi.org/10.1016/j.elspec.2017.03.011
Publication status	Published - Nov 2017

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

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Operando X-ray photoelectron spectroscopic investigations of the electrochemical double layer at Ir/KOH(aq) interfaces. / Lichterman, Michael F.; Richter, Matthias H.; Brunschwig, Bruce S.; Lewis, Nathan S.; Lewerenz, Hans Joachim.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 221, 11.2017, p. 99-105.

Research output: Contribution to journal › Article › peer-review

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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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