Effect of the Air Contamination in Infrastructure Emission CO₂ Source Gas of Co-Electrolytic SOEC System on the Energy Efficiency

Abstract

Co-electrolysis, which is the electrolysis of carbon dioxide and water vapor into hydrogen and carbon monoxide by supplying electric power to solid oxide cells, has attracted much attention because of its high energy conversion efficiency. However, since some carbon dioxide sources contain nitrogen and unburned oxygen, a system analysis of the effect of the concentration of these gas mixtures on energy efficiency was conducted. As a result, it was shown that the efficiency was greatly reduced when both nitrogen and oxygen were supplied at the same time, compared to the case where only nitrogen or oxygen was mixed.