Kink energy and kink dipole moments on vicinal Au(001) in halide electrolytes

Using electrochemical scanning tunnelling microscopy, we measured the potential-dependent kink energy and the corresponding dipole moments of kinks at step edges on vicinal Au(001) surfaces in chloride and bromide containing electrolytes. Combining the results of the potential dependence of the kink...

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Published inPhysical chemistry chemical physics : PCCP Vol. 16; no. 24; pp. 12143 - 12149
Main Authors Al-Shakran, M, Beltramo, G, Giesen, M
Format Journal Article
LanguageEnglish
Published England 28.06.2014
Subjects
Chlorides
Dipole moment
Electrolytes
Energy use
Gold
Physical chemistry
Scanning tunneling microscopy
Surface charge
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Summary:Using electrochemical scanning tunnelling microscopy, we measured the potential-dependent kink energy and the corresponding dipole moments of kinks at step edges on vicinal Au(001) surfaces in chloride and bromide containing electrolytes. Combining the results of the potential dependence of the kink energy with impedance spectroscopy data for the surface charge, we can directly deduce the dipole moment of kinks at the Au steps with co-adsorbed Cl − and Br − , respectively. We find μ Cl = (6.0 ± 0.7) × 10 −3 eÅ and μ Br = (10.1 ± 0.6) × 10 −3 eÅ. We present a method to measure kink dipole moments in electrolytes using step fluctuation analysis and surface charge density data.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c4cp00448e