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Methanol electro-oxidation on the Pt surface: Revisiting the cyclic voltammetry interpretation

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Title
Methanol electro-oxidation on the Pt surface: Revisiting the cyclic voltammetry interpretation
Author(s)
Dong Young Chung; Kyung Jae Lee; Yung-Eun Sung
Publication Date
2016-05
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.120, no.17, pp.9028 - 9035
Publisher
AMER CHEMICAL SOC
Abstract
Methanol is a promising fuel for direct methanol fuel cells in portable devices. A deeper understanding of its electro-oxidation is needed for evaluating electrocatalytic performance and catalyst design. Here we provide an in-depth investigation of the cyclic voltammetry (CV) of methanol electro-oxidation. The oxidation peak in backward scan is shown to be unrelated to residual intermediate oxidation. The origin of the second oxidation peak (If2) is expected to the methanol oxidation on Pt-Ox. Electrochemical impedance spectroscopy coupled with CV reveals the origin of CV hysteresis to be a shift in the rate-determining step, from methanol dehydration to OH adsorption by water dissociation, induced by a change in Pt surface coverage with oxygenated species. The peak ratio between forward oxidation peak current (If) and backward oxidation peak current (Ib), which is If/Ib, is not related to the degree of CO tolerance but to the degree of oxophilicity indeed. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2672
ISSN
1932-7447
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
Files in This Item:
26 J.PhysicalChemC(Methanol Electro-oxidation on the Pt Surface).pdfDownload

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