CARBON DIOXIDE REDUCTION ELECTRODE AND CARBON DIOXIDE REDUCTION DEVICE IN WHICH THE SAME IS USED

摘要

PROBLEM TO BE SOLVED: To provide a COreduction electrode and a COreduction device making it possible to sufficiently obtain a reduction product comprising organic matter, etc.SOLUTION: A reduction electrode (1) has an electroconductive substrate (11), a p-type optical semiconductor (12) provided thereon, and an n-type optical semiconductor (13) provided on the p-type optical semiconductor (12). The reduction electrode (1) is used in a reduction device (8). The energy level of the conduction band of the p-type optical semiconductor (12) is higher in the negative direction than the energy level of the conduction band of the n-type optical semiconductor (13). The energy level of the valence band of the p-type optical semiconductor (12) is higher in the negative direction than the energy level of the valence band of the n-type optical semiconductor (13).