Unravelling the electrochemical double layer by direct probing of the solid/liquid interface

Marco Favaro, Beomgyun Jeong, Philip N. Ross, Junko Yano, Zahid Hussain, Zhi Liu () and Ethan J. Crumlin ()
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Marco Favaro: Advanced Light Source, Lawrence Berkeley National Laboratory
Beomgyun Jeong: Advanced Light Source, Lawrence Berkeley National Laboratory
Philip N. Ross: Lawrence Berkeley National Laboratory
Junko Yano: Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory
Zahid Hussain: Advanced Light Source, Lawrence Berkeley National Laboratory
Zhi Liu: Advanced Light Source, Lawrence Berkeley National Laboratory
Ethan J. Crumlin: Advanced Light Source, Lawrence Berkeley National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract The electrochemical double layer plays a critical role in electrochemical processes. Whilst there have been many theoretical models predicting structural and electrical organization of the electrochemical double layer, the experimental verification of these models has been challenging due to the limitations of available experimental techniques. The induced potential drop in the electrolyte has never been directly observed and verified experimentally, to the best of our knowledge. In this study, we report the direct probing of the potential drop as well as the potential of zero charge by means of ambient pressure X-ray photoelectron spectroscopy performed under polarization conditions. By analyzing the spectra of the solvent (water) and a spectator neutral molecule with numerical simulations of the electric field, we discern the shape of the electrochemical double layer profile. In addition, we determine how the electrochemical double layer changes as a function of both the electrolyte concentration and applied potential.

Date: 2016
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DOI: 10.1038/ncomms12695

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