A detailed look into hydrogen electrochemical oxidation on ceria anodes. (1st September 2018)

• Record Type: Journal Article
• Authors: Tabish, A.N.; Patel, H.C.; Schoonman, J.; Aravind, P.V.
• Is Part Of: Electrochimica acta. Volume 283(2018)
• Page Start: 789
• Page End: 797
• Publication Date: 2018-09-01
• Subjects: Pattern anodes -- SOFC -- Ceria -- NPP model -- Elementary kinetics; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.05.058
• Languages: English
• ISSNs: 0013-4686

Abstract

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.