Abstract
In the quest for long-lasting energy alternatives, solid oxide electrolysers have become a crucial technology in facilitating the transformation of CO2 toward fuels and valuable chemicals. This study proposes a unique method for the catalytic reduction of carbon dioxide at the cathode using porous CeO2 single-crystal electrodes in a solid oxide electrolyser, utilizing temperatures from an industrial waste heat stream. The fluxes and chemical states of oxygen-containing species evolved from the cathode were identified and designed, and the catalytic process of CO2 reduction to CO was effectively regulated by the oxygen-containing species (lattice oxygen, oxygen vacancies and adsorbed oxygen). The results show that the CO yield can reach 6.05 mL min−1 cm−1 with porous (111) CeO2 single crystal as the cathode at 850 °C and 1.8 V. The solid oxide electrolyser exhibits remarkable stability even after 100 h of continuous operation.
Published Version
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