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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
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Anion replacement at Au(110)/electrolyte interfaces
P Harrison1, C I Smith, Y Gründer
1Department of Physics, University of Liverpool, Liverpool L69 7ZE, UK. peterw@liverpool.ac.uk.
Physical Chemistry Chemical Physics : PCCP
|August 19, 2016
Summary
A common reflection anisotropy spectrum (RAS) from gold surfaces is linked to electrode potential and oxidized species. Rapid spectral changes indicate anion replacement by oxygenated species on Au(110) surfaces.
Area of Science:
- Surface science
- Electrochemistry
- Spectroscopy
Background:
- Reflection anisotropy spectroscopy (RAS) reveals characteristic spectra from Au(110) surfaces across various electrolytes and potentials.
- The common RAS profile is hypothesized to stem from the interaction between applied electrode potential and oxidized species' dipole moments, aligning the Fermi level within Au's electronic band structure.
Purpose of the Study:
- To investigate the dynamic changes in the RAS profile of Au(110) surfaces under specific electrochemical conditions.
- To elucidate the mechanisms behind rapid spectral shifts observed within a defined potential range.
Main Methods:
- Electrochemical measurements using Au(110) electrodes.
- Reflection anisotropy spectroscopy (RAS) to monitor surface electronic properties.
- Potential-controlled experiments in H2SO4 electrolyte.
Main Results:
- A consistent RAS profile was observed for Au(110) across diverse electrolytes and potentials.
- Rapid, reversible spectral changes (<10 ms) occurred on Au(110)/H2SO4 when switching potential between 0.3 V and 0.6 V.
- These changes occurred in a potential range where the surface remains non-reconstructed and below oxidation potentials.
Conclusions:
- The observed RAS phenomena are attributed to the interplay between applied potential, surface species, and the electronic structure of gold.
- The rapid spectral shifts indicate a fast surface process involving the replacement of adsorbed anions by oxygenated species.
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