[22a-P5-1~18] 6.4 Thin films and New materials

[22a-P5-12] Reactive Stabilities of TiO₂/Cu₂O photocathodes for reduction of H₂O

〇Masami Nishikawa¹, Masayuki Fukuda¹, Yoshio Nosaka¹, Tomohiko Nakajima², Tetsuo Tsuchiya², Nobuo Saito¹ (1.Nagaoka Univ. of Tech., 2.AIST)

Keywords:photoelectrode,excimer laser,Cu2O

To raise the reaction stabilities of Cu₂O photocathodes for reduction of water, we examined the compositing effect of TiO₂ layers on the Cu₂O photocathodes using an excimer-laser-assisted metal organic deposition (ELAMOD) process. By using the ELAMOD process, the highly crystalized TiO₂ layers were successfully composited on the Cu₂O photocathodes without oxidation of Cu₂O to CuO which causes the decline of performance of water reduction. The TiO₂/Cu₂O photocathode obtained had the same level of water reduction performance as the bare Cu₂O. Moreover, the water reduction performance of the TiO₂/Cu₂O photocathode was constant by reaction time while that of the bare Cu₂O photocathode was declined, indicating that the TiO₂/Cu₂O photocathode obtained was chemically high stable.