Deconvolution of Gas Diffusion Polarization in Ni/Gadolinium-Doped Ceria Fuel Electrodes

The deconvolution of physicochemical processes in impedance spectra SOCs with nickel/ceria fuel electrodes is challenging as gas diffusion strongly overlaps the electrochemical at and air electrode. To overcome this issue, symmetrical cells were applied process electrode was quantified by altering inert component (nitrogen/helium) a ternary mixture. An effective transport parameter considering microstructural geometrical features derived, enabling precise quantification polarization resistances related to hydrogen electrooxidation. obtained values parameterize dc cell model. model validation electrolyzer mode showed an excellent agreement between measured simulated current/voltage characteristics over wide range technically meaningful compositions operating temperatures.