This project has developed a new testing capability at PNNL and has evaluated solid oxide electrolysis cell (SOEC) materials for the ability to co-electrolyze carbon dioxide and steam to produce synthesis gas.
CO2-H2O co-electrolysis, the simultaneous electrochemical reduction of carbon dioxide and steam, was performed on the porous Ni-based electrodes in high temperature SOECs. Experiments were conducted using small button cells and the rate of the electrochemical reactions was measured at 750oC for varied reactant compositions: 10-98%CO2 and 5-50% H2O, also in the presence of some H2 and CO to ensure reducing environment and avoid Ni oxidation.