Detailed H2 and CO Electrochemistry for a MEA Model Fueled by Syngas
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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.
CitationLee WY, Ong KM, Ghoniem AF (2015) Detailed H2 and CO Electrochemistry for a MEA Model Fueled by Syngas. ECS Transactions 68: 3059–3074. Available: http://dx.doi.org/10.1149/06801.3059ecst.
SponsorsThis work has been supported by the Samsung Scholarship Foundation and an awardfrom King Abdullah University of Science and Technology.
PublisherThe Electrochemical Society
Conference/Event name14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage