Detailed H2 and CO Electrochemistry for a MEA Model Fueled by Syngas

W. Y. Lee, K. M. Ong, A. F. Ghoniem

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

© The Electrochemical Society. SOFCs can directly oxidize CO in addition to H2, which allows them to be coupled to a gasifier. Many membrane-electrode-assembly (MEA) models neglect CO electrochemistry due to sluggish kinetics and the water-gas-shift reaction, but CO oxidation may be important for high CO-content syngas. The 1D-MEA model presented here incorporates detailed mechanisms for both H2 and CO oxidation, individually fitted to experimental data. These mechanisms are then combined into a single model, which provides a good fit to experimental data for H2/CO mixtures. Furthermore, the model fits H2/CO data best when a single chargetransfer step in the H2 mechanism is assumed to be rate-limiting for all current densities. This differs from the result for H2/H2O mixtures, where H2 adsorption becomes rate-limiting at high current densities. These results indicate that CO oxidation cannot be neglected in MEA models running on CO-rich syngas, and that CO oxidation can alter the H2 oxidation mechanism.
Original languageEnglish (US)
Title of host publicationECS Transactions
PublisherThe Electrochemical Society
Pages3059-3074
Number of pages16
ISBN (Print)9781607685395
DOIs
StatePublished - Jul 17 2015
Externally publishedYes

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