Journal Article <論文・報告>可視光水分解用TaON 光アノードの高効率化を目的とした水の酸化助触媒の開発

野口, 輝  ,  山中, 雄太  ,  冨田, 修  ,  東, 正信  ,  阿部, 竜

1pp.70 - 72 , 2016-03 , 京都大学学際融合教育研究推進センター高大接続科学教育ユニット
工学 物質科学と環境・エネルギー
Photoelectrochemical (PEC) water splitting using semiconductor materials have attracted considerable attention due to their potential for clean production of H2 from water by utilizing solar energy. TaON photoelectrodes have the potential to produce H2 and O2 from water under visible light, even without an externally applied bias. However, TaON is generally unstable under light irradiation in aqueous solution due to self-oxidative deactivation caused by photogenerated holes accompanied by the release of N3– anions. We have recently demonstrated stable water splitting on a CoOx-modified TaON photoanode, wherein the CoOx nanoparticles, acting as a catalyst for water oxidation, effectively scavenge the holes in TaON and suppress oxidative deactivation of the TaON surface. Loading of cocatalysts on oxynitrides improves stability and is required to achieve efficient PEC water splitting. Therefore, the development of cocatalysts for water oxidation is one of the most important subjects for achieving efficient PEC water splitting using such unstable oxynitrides as photoanodes. In the present study, we investigated the influence of various metal oxide species (Ni, Cu, Fe, Mn, Cr, and Ru) when loaded on a TaON electrode on the photocurrent generated under visible light irradiation. Ni, Cu, Fe, and Mn were found to improve the photocurrent stability of TaON.

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