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Oxidation of formaldehyde and ethanol on Au(1 1 1) and Au(1 1 1) modified by spontaneously deposited Ru in sulfuric acid solution

Authorized Users Only
2009
Authors
Štrbac, Svetlana
Avramov Ivić, Milka
Article (Published version)
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Abstract
The oxidation of formaldehyde and ethanol on both pure Au(1 1 1) and Au(1 1 1) modified by approximately 0.3 monolayer (ML) of spontaneously deposited Ru was studied by cyclic voltammetry (CV) in 0.5 M H2SO4 solution containing either 0.25 M formaldehyde or 0.35 M ethanol. In situ scanning tunneling microscopy (STM) and CV were employed to characterize the Au(1 1 1) and Ru/Au(1 1 1) surfaces. The oxidation of HCHO on Ru/Au(1 1 1) commences at 0.1 V more negative potential than on pure Au(1 1 1). From 0.25 to 0.55 V vs. (Ag/AgCl), the reaction occurs with increasing current, showing a peak at a potential of 0.43 V. It is assumed that the increasing anodic activity of the Ru/Au(1 1 1) surface is associated with the oxidation of some reaction intermediates, facilitated by the presence of Ru in its metallic state. On the other hand, the oxidation of ethanol on Ru/Au(1 1 1) commences at 0.1 V more positive potential than on pure Au(1 1 1), and proceeds in the potential region from 0.2 to 0....5 V with significantly smaller currents, showing a peak at 0.43 V. This inhibiting effect is explained by the deactivation of the most active Au(1 1 1) step sites by high coverage with Ru islands. The appearance of a small peak at 0.43 V is most likely associated to the oxidation of some intermediates during ethanol oxidation at the Ru/Au step sites formed on the Au(1 1 1) terraces by the presence of a small coverage with Ru islands.

Keywords:
Au(1 1 1) / Ethanol / Formaldehyde / Oxidation / Ru / Spontaneous deposition
Source:
Electrochimica Acta, 2009, 54, 23, 5408-5412
Publisher:
  • Pergamon-Elsevier Science Ltd, Oxford
Projects:
  • Dobijanje i karakterizacija površina nanostrukturnih materijala (RS-141001)

DOI: 10.1016/j.electacta.2009.04.031

ISSN: 0013-4686

WoS: 000268518500015

Scopus: 2-s2.0-67649312282
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/574
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