Electro-oxidation of Au(1 1 1) in contact with aqueous electrolytes: New insight from in situ vibration spectroscopy

Zhumaev, Ulmas; Rudnev, Alexander; Li, Jianfeng; Kuzume, Akiyoshi; Vu, Thu-Hien; Wandlowski, Thomas (2013). Electro-oxidation of Au(1 1 1) in contact with aqueous electrolytes: New insight from in situ vibration spectroscopy. Electrochimica acta, 112, pp. 853-863. Elsevier Science 10.1016/j.electacta.2013.02.105

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We carried out a comprehensive study of Au(1 1 1) oxidation–reduction in the presence of (hydrogen-) sulfate ions on ideally smooth and stepped Au(S)[n(1 1 1)-(1 1 1)] single crystal electrodes using cyclic voltammetry, in situ scanning tunneling microscopy (STM) and vibration spectroscopy, such as surface-enhanced infrared absorption spectroscopy (SEIRAS) and shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Surface structure changes and the role of surface defects in the potential regions of double layer charging and gold oxidation/reduction are discussed based on cyclic voltammetry and in situ STM data. SEIRAS and SHINERS provide complementary information on the chemical nature of adsorbates. In particular, the potential-dependent formation and stability ranges of adsorbed sulfate, hydroxide-species and of gold surface oxide could be resolved in detail. Based on our experimental observations, we proposed new and extended mechanisms of gold surface oxidation and reduction in 1.0 M H2SO4 and 1.0 M Na2SO4.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Zhumaev, Ulmas; Rudnev, Alexander; Li, Jianfeng; Kuzume, Akiyoshi; Vu, Thu-Hien and Wandlowski, Thomas

Subjects:

500 Science > 540 Chemistry

ISSN:

0013-4686

Publisher:

Elsevier Science

Funders:

[UNSPECIFIED] European Union ; [4] Swiss National Science Foundation ; [UNSPECIFIED] University of Bern

Language:

English

Submitter:

Ulmas Zhumaev

Date Deposited:

17 Jan 2014 10:06

Last Modified:

11 Aug 2015 10:53

Publisher DOI:

10.1016/j.electacta.2013.02.105

Uncontrolled Keywords:

Electrochemical oxidation, Stepped gold single crystals, Au(1 1 1), STM, SEIRAS, SHINERS

BORIS DOI:

10.7892/boris.39812

URI:

https://boris.unibe.ch/id/eprint/39812

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