A detailed look into hydrogen electrochemical oxidation on ceria anodes

TitleA detailed look into hydrogen electrochemical oxidation on ceria anodes
Publication TypeJournal Article
Year of Publication2018
AuthorsA.N Tabish, H.C Patel, J. Schoonman, P.V Aravind
JournalElectrochimica Acta
Volume283
Pagination789-797
Date Published9/2018
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.

DOI10.1016/j.electacta.2018.05.058
Division

MaSF

Department

CEPEA

PID

6934dcb6630e9c75229640f52b293481

Alternate TitleElectrochim. Acta

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