Yoshida Hisao, Yamada Ryoko, Yoshida Tomoko
Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto, 606-8501, Japan.
Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, 615-8520, Japan.
ChemSusChem. 2019 May 8;12(9):1958-1965. doi: 10.1002/cssc.201802799. Epub 2019 Mar 18.
In water splitting by using heterogeneous photocatalysts, the use of a suitable cocatalyst has been recognized as one of the key factors in enhancing the photocatalytic activity. Although platinum is a representative cocatalyst for many heterogeneous photocatalytic reactions, it has not been used for photocatalytic water splitting, owing to its high catalytic activity for the reverse reaction of water splitting. In the present study, platinum nanoparticles were loaded as a cocatalyst on a calcium titanate photocatalyst by a conventional impregnation method and a photodeposition method and examined for photocatalytic water splitting in a flow of water vapor. Platinum nanoparticles loaded by the impregnation method were found to retain the oxidized form on the calcium titanate photocatalyst, even under photoirradiation, and promoted hydrogen and oxygen production by photocatalytic water vapor splitting without promoting the reverse reaction.
在使用多相光催化剂进行水分解时，使用合适的助催化剂已被认为是提高光催化活性的关键因素之一。尽管铂是许多多相光催化反应的代表性助催化剂，但由于其对水分解逆反应具有高催化活性，尚未用于光催化水分解。在本研究中，通过传统浸渍法和光沉积法将铂纳米颗粒作为助催化剂负载在钛酸钙光催化剂上，并在水蒸气流动中对其光催化水分解性能进行了研究。结果发现，通过浸渍法负载的铂纳米颗粒即使在光照射下也能在钛酸钙光催化剂上保持氧化态，并且能够促进光催化水蒸气分解产生氢气和氧气，而不会促进逆反应。
