小型固体酸化物形セルを用いた水蒸気/二酸化炭素共電解に及ぼす供給ガス条件の影響

抄録

In H₂O/CO₂ co-electrolysis using solid oxide electrolysis cell (SOEC), reaction characteristics are expected to depend on the supply gas compositions. In addition, since the reverse water gas shift (RWGS) reaction occurs using Ni in the anode as a catalyst, the composition of the supply gas and that in the reaction area are expected to be different. In this paper, electrochemical performance of an anode-supported cell is investigated in various supply gas conditions under co-electrolysis, H₂O electrolysis, and CO₂ electrolysis operations. The gas compositions after the electrolysis reactions are also analyzed. It is found that the RWGS reaction does not reach equilibrium in the conditions analyzed in this study. Also, it is found that the electrochemical properties under co-electrolysis operation are similar to those under H₂O electrolysis.