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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Electrocatalytic oxidation of methanol at tantalum oxide-modified Pt electrodes
Journal of Power Sources, Volume 220, Year 2012
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Description
The current study addresses the electrocatalytic activity of tantalum oxide (TaOx)-modified Pt electrode as a novel catalyst for methanol oxidation in acidic media. The modified Pt electrode is shown to support a larger oxidation current of methanol compared to that obtained at the unmodified Pt electrode concurrently with a favorable significant shift of the onset potential of methanol oxidation. Tafel plots, with a slope close to 0.118 V decade -1, were obtained for methanol oxidation at the unmodified and TaOx-modified Pt electrodes, reflecting that the methanol oxidation proceeds with the first electron transfer as the rate-determining step. The observed enhancement was attributed to a favorable d-d metal-metal oxide interaction which changes the electronic property of Pt and hence enhances the oxidation of the adsorbed reaction intermediates (e.g., CO ads). Moreover, a possible contribution of the OH spillover via a so-called "bifunctional mechanism" is proposed. The influence of the temperature on the oxidation current of methanol at the TaOx-modified Pt electrode is investigated and apparent activation energy, E a, for methanol oxidation is calculated as 39 kJ mol -1 at a specific potential. The proposed catalyst showed a good enhancement for methanol oxidation for a prolonged time of continuous potentiostatic electrolysis. © 2012 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Masud, Jahangir
Japan, Tokyo
Tokyo Institute of Technology
Alam, Muhammad T.
Japan, Tokyo
Tokyo Institute of Technology
Australia, Sippy Downs
University of the Sunshine Coast
Awaludin, Zaenal
Japan, Tokyo
Tokyo Institute of Technology
El-Deab, Mohamed S.
Japan, Tokyo
Tokyo Institute of Technology
Egypt, Giza
Faculty of Science
Okajima, Takeyoshi
Japan, Tokyo
Tokyo Institute of Technology
Ohsaka, Takeo
Japan, Tokyo
Tokyo Institute of Technology
Statistics
Citations: 37
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/j.jpowsour.2012.07.098
ISSN:
03787753