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Characterisation of platinised Ti mesh electrodes using electrochemical methods: Methanol oxidation in sodium hydroxide solutions

Lookup NU author(s): Dr Eileen Yu, Professor Keith Scott, Dr Robert Reeve, Dr Lianxi Yang, Ruth Allen

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Abstract

Characterisation of a platinised Ti mesh electrode, prepared by electrodeposition of Pt, by methanol oxidation has been studied over a range of NaOH and methanol concentrations using cyclic voltammetry (CV), quasi-steady-state polarisation, and electrochemical impedance spectroscopy (EIS). The activity of methanol oxidation in aqueous alkaline systems increased with pH or OH species coverage on the electrode surface. A reaction order of close to 0.5 was obtained for both NaOH and methanol in NaOH solutions indicating that adsorption of methanol and OH- on the platinised electrode follows Termkin isotherm. In the high potential region, a poisoning effect was observed at methanol/[OH-] concentration ratio greater than 1, which could have arisen from an excess of methanol at the electrode surface and/or depletion of OH- at the electrode surface. The methanol oxidation behaviour conforms with that on Pt electrodes suggesting a promising new method of preparing electrodes for fuel cells. © 2004 Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Yu EH, Scott K, Reeve RW, Yang L, Allen RG

Publication type: Article

Publication status: Published

Journal: Electrochimica Acta

Year: 2004

Volume: 49

Issue: 15

Pages: 2443-2452

ISSN (print): 0013-4686

ISSN (electronic): 1873-3859

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.electacta.2004.01.022

DOI: 10.1016/j.electacta.2004.01.022


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