4.6 Article

Understanding reaction mechanisms using dynamic electrochemical impedance spectroscopy: Methanol oxidation on Pt

Journal

ELECTROCHIMICA ACTA
Volume 323, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134764

Keywords

Dynamic electrochemical impedance spectroscopy; Methanol oxidation; Temperature; Reaction mechanism

Funding

  1. Natural Sciences and Engineering Research Council of Canada [RGPNM 477963-2015, RGPIN-2017-04045]
  2. Research Council of Norway through the FRIPRO program [221899]
  3. Research Council of Norway through the INTPART program [261620]
  4. Faculty of Natural Sciences at NTNU

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Data from a combined cyclic voltammetry and dynamic electrochemical impedance spectroscopy (dEIS) study of the methanol oxidation reaction (MOR) at high temperatures was revisited using a new method for mechanistic modeling. Through iterative optimization of kinetic parameters, a total of five reaction mechanisms of the indirect pathway of the MOR were modeled. The calculated dEIS spectra from the kinetic parameters were used to verify the reaction mechanisms and best fits were found where i) water adsorption is reversible and hinders the MOR at lower potentials (< 0.50 V vs RHE), and ii) the surface reaction between adsorbed CO and OH is chemical. (C) 2019 Elsevier Ltd. All rights reserved.

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