Electrocatalytic oxidation of methanol at tantalum oxide−modified Pt electrodes

J Masud; Muhammad Tanzirul Alam; Z Awaludin; M S El-Deab; T Okajima; T Ohsaka

doi:10.1016/j.jpowsour.2012.07.098

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Electrocatalytic oxidation of methanol at tantalum oxide−modified Pt electrodes

Journal article

Open access

Peer reviewed

Electrocatalytic oxidation of methanol at tantalum oxide−modified Pt electrodes

J Masud, Muhammad Tanzirul Alam, Z Awaludin, M S El-Deab, T Okajima and T Ohsaka

Journal of Power Sources, Vol.220, pp.399-404

2012

DOI: https://doi.org/10.1016/j.jpowsour.2012.07.098

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Abstract

electrocatalysis

metal oxides

fuel cells

electronic interaction

menthanol oxidation

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, 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., COads). 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, Ea, 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.

Details

Title: Electrocatalytic oxidation of methanol at tantalum oxide−modified Pt electrodes
Authors: J Masud (Author) - Tokyo Institute of Technology, Japan
Muhammad Tanzirul Alam (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Z Awaludin (Author) - Tokyo Institute of Technology, Japan
M S El-Deab (Author) - Tokyo Institute of Technology, Japan
T Okajima (Author) - Tokyo Institute of Technology, Japan
T Ohsaka (Author) - Tokyo Institute of Technology, Japan
Publication details: Journal of Power Sources, Vol.220, pp.399-404
Publisher: Elsevier S.A.
Date published: 2012
DOI: 10.1016/j.jpowsour.2012.07.098
ISSN: 0378-7753
Organisation Unit: University of the Sunshine Coast, Queensland; National Centre for Timber Durability and Design Life
Language: English
Record Identifier: 99450498602621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary

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