Dynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperatures

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dc.contributor.authorHolm, Thomas
dc.contributor.authorDahlstrøm, Per Kristian
dc.contributor.authorSunde, Svein
dc.contributor.authorSeland, Frode
dc.contributor.authorHarrington, David A.
dc.date.accessioned2019-05-08T19:26:55Z
dc.date.copyright2019en_US
dc.date.issued2019
dc.description.abstractThe methanol oxidation reaction (MOR) is studied at temperatures up to 140 °C by a combination of cyclic voltammetry, chronoamperometry, and dynamic electrochemical impedance spectroscopy (dEIS). A mechanistic analysis of the reaction is done based on the Tafel relation, the calculated activation energy, and the fitting of dEIS data. At the fuel cell relevant potentials, 0–0.80 V vs RHE, the MOR mechanism is similar at all temperatures. The rate-determining step is the adsorption of water at low overpotentials (< 0.50 V vs RHE), a combination of the methanol adsorption reaction and the surface reaction between adsorbed CO and OH at intermediate potentials (0.50–0.65 V vs RHE), and the methanol adsorption reaction at high potentials (> 0.65 V vs RHE). The shoulder on the oxidation peak at 0.60–0.65 V vs RHE corresponds well with where the CO coverage approaches zero.en_US
dc.description.embargo2021-03-01
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThis work was financially supported by the Natural Sciences and Engineering Research Council of Canada through its Discovery Frontiers program (Engineered Nickel Catalysts for Electrochemical Clean Energy project administered from Queen's University, grant RGPNM 477963-2015) and Discovery Grants program (grant 37035), and by the Research Council of Norway through projects 178478 and 221899 as well as the INTPART project 261620. P.K.D. and T.H. thank the Department of Materials Science and Engineering at NTNU for individual Scholarships. T.H. thanks Andreas Holm for the help with efficient data processing.en_US
dc.identifier.citationHolm, T., Dahlstrøm, R.K., Sunde, S., Seland, F. & Harrington, D.A. (2019). Dynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperatures. Electrochimica Acta, 295, 139-147. https://doi.org/10.1016/j.electacta.2018.10.071en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.electacta.2018.10.071
dc.identifier.urihttp://hdl.handle.net/1828/10860
dc.language.isoenen_US
dc.publisherElectrochimica Actaen_US
dc.subjectElectrochemical impedance spectroscopy
dc.subjectMethanol oxidation
dc.subjectTemperature
dc.subjectReaction mechanism
dc.subject.departmentDepartment of Chemistry
dc.titleDynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperaturesen_US
dc.typePostprinten_US

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