A detailed look into hydrogen electrochemical oxidation on ceria anodes
A. N. Tabish (TU Delft - Energy Technology, University of Engineering and Technology Lahore)
H. C. Patel (Dutch Institute for Fundamental Energy Research)
Joop Schoonman (TU Delft - ChemE/Materials for Energy Conversion and Storage)
Aravind Purushothaman Vellayani (TU Delft - Energy Technology)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.
help_outline