title: Electrooxidation of methanol on upd-Ru and upd-Sn modified Pt electrodes.
abstract: The electrochemical oxidation of methanol has been investigated on underpotentially deposited-ruthenium-modified platinum electrode (upd-Ru/Pt) and on underpotentially deposited-tin-modified platinum electrode (upd-Sn/Pt). The submonolayers of upd-Ru and upd-Sn on a Pt electrode increased the rate of methanol electrooxidation several times as large as that on a pure Pt electrode. The best performance for methanol electrooxidation was obtained on a ternary platinum based catalyst modified by upd-Ru and upd-Sn simultaneously. The influence of the submonolayers of upd-Ru adatoms and upd-Sn adatoms on the oxidation of methanol in acid has been investigated. The effect of Ru on methanol electrooxidation lies on the distribution of Ru adatoms on a Pt surface. It has been shown that as long as the amount of upd-Ru deposits were controlled in a proper range, upd-Ru deposits would enhance the methanol oxidation obtained on a Pt electrode at whichever deposition potential the upd-Ru deposits were obtained. The effects of tin are sensible to the potential range. The enhancement effect of upd-Sn adatoms for the oxidation of methanol will disappear as the electrode potential is beyond a certain value. It is speculated that there exists a synergetic effect on the Pt electrode as adatoms Ru and Sn participate simultaneously in the methanol oxidation.
authors.affiliation: Key Laboratory of High Voltage Engineering and Electrical New Technology, Chongqing University, Chongqing, 400044, China. zdwei@cqu.edu.cn
authors.forename: Z D
authors.initials: ZD
authors.lastname: Wei
authors.forename: L L
authors.initials: LL
authors.lastname: Li
authors.forename: Y H
authors.initials: YH
authors.lastname: Luo
authors.forename: C
authors.initials: C
authors.lastname: Yan
authors.forename: C X
authors.initials: CX
authors.lastname: Sun
authors.forename: G Z
authors.initials: GZ
authors.lastname: Yin
authors.forename: P K
authors.initials: PK
authors.lastname: Shen