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Modeling of Gas Diffusion in Ni/YSZ Electrodes in CO 2 and Co‐electrolysis
Author(s) -
Dragsbæk Duhn J.,
Degn Jensen A.,
Wedel S.,
Wix C.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201700068
Subject(s) - electrolysis , carbon fibers , cathode , diffusion , electrode , materials science , tortuosity , gaseous diffusion , chemical engineering , analytical chemistry (journal) , syngas , current density , porosity , chemistry , composite material , thermodynamics , electrolyte , organic chemistry , physics , quantum mechanics , composite number , engineering , hydrogen
Carbon formation may occur during CO 2 and CO 2 /H 2 O electrolysis using solid oxide electrolyzer cells due to the Boudouard reaction (2CO → CO 2 + C(s)). Formed carbon may disintegrate the cell structure and it is therefore of importance to be able to predict when carbon is formed, and take actions to prevent its formation. For prediction of carbon formation, the gas composition in the electrode must be known. In this work, the diffusion of gases in the electrode has been modeled with the dusty gas model in 1 and 2 dimensions, and the effect of tortuosity, porosity, temperature, electrode thickness, pore diameter, current density, pitch and rib width has been investigated. It is shown that diffusion limitations on reactant/product transport may lead to carbon formation. The parameters describing the microstructure and the dimensions of the cathode channels and interconnect ribs are found to have a large effect on the carbon formation propensity. Given a set of parameters, a simple correlation between the CO mole fraction in the channel and under the interconnect rib, and current density during CO 2 ‐electrolysis can be derived. This correlation makes it possible to efficiently integrate the calculation of carbon formation risk in existing electrolyzer cell models.