A detailed look into hydrogen electrochemical oxidation on ceria anodes

A. N. Tabish, H. C. Patel, Joop Schoonman, Aravind Purushothaman Vellayani

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Abstract

Using the Nernst-Planck-Poisson model and a detailed reaction mechanism, we studied the hydrogen electrochemical oxidation on a ceria anode. Resistances caused by surface kinetics, and bulk transport of oxide-ion vacancies and electrons are computed individually to identify the dominant resistive process. The effect of operating conditions like temperature and gas-phase composition on the polarization resistance is evaluated and compared with the experimental data obtained by Electrochemical Impedance Spectroscopy (EIS). The rate-determining step is found to be the charge-transfer reaction in which hydrogen adsorbs at the surface oxide ions and forms hydroxyls along with the charge-transfer to adjacent cerium ions. Based on the rate-determining step, the exchange-current density is also calculated and validated with the experimental data.

Original languageEnglish
Pages (from-to)789-797
JournalElectrochimica Acta
Volume283
DOIs
Publication statusPublished - 2018

Keywords

  • Ceria
  • Elementary kinetics
  • NPP model
  • Pattern anodes
  • SOFC

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