Optimization of Solid Oxide Fuel Cell Ni-CGO Anode Porosity

Microstructure of supporting Ni-CGO anodes for intermediate temperature solid oxide fuel cells (SOFC) has been systematically optimized by changing the amount of a pore former in the anode raw material. In the second series of experiments, the influence of pore former particle size distribution on the anode microstructure has been studied. All single cells prepared have been analyzed electrochemically as well as by different structural analysis methods. For the identification of characteristic frequencies and corresponding parameters of cathodic and anodic processes, the single cell impedance spectra were recorded and compared analytically as a function of applied potential, partial pressure of hydrogen and partial pressure of oxygen. The data obtained have been analyzed in detail using non-linear regression analysis fitting and differential derivate of impedance modulus versus frequency dependence methods.