An Al-doped SrTiO₃photocatalyst maintaining sunlight-driven overall water splitting activity for over 1000 h of constant illumination

Abstract

The development of robust and efficient water splitting photocatalysts overcomes a long-standing barrier to sustainable large-scale solar hydrogen evolution systems.

Achievement of High Photocatalytic Performance to BaTi4O9 Toward Overall H2O Splitting

“…The result suggests that the degradation of the Rh 0.7 Cr 1.3 O 3 co‐catalyst is also progress beside the overall H 2 O splitting. According to the previous studies, the degradation of the Rh y Cr 2‐y O 3 co‐catalyst was reported to proceed by oxidizing Cr 3+ to Cr 6+ as chromate ion to dissolve in H 2 O. From the investigations in the previous study, under the oxidation process of H 2 O by photo‐generated holes, the degradation of the Rh 0.7 Cr 1.3 O 3 co‐catalyst also proceeds instead of production of O 2 .…”

“…Recently, metal ion doped SrTiO 3 combined with a Rh y Cr 2‐y O 3 co‐catalyst was reported to show the excellent photocatalytic activity to the reaction. Particularly, Al ion doped SrTiO 3 prepared by the flux method exhibits extremely high photocatalytic activity under the irradiation of near‐UV region light that is containing the solar irradiation, where the apparent quantum yield is more than 50 % at 365 nm. A panel type reactor was made with using the photocatalyst and the overall H 2 O splitting was demonstrated under solar irradiation .…”

“…A panel type reactor was made with using the photocatalyst and the overall H 2 O splitting was demonstrated under solar irradiation . Moreover, the photocatalyst has been reported to improve the photocatalytic activity and the durability to overall H 2 O splitting . Besides SrTiO 3 , few investigations have been carried out on the photocatalysts of Ti mixed oxides that can work under near UV irradiation for improving the photocatalytic activity to the level for the practical application as Al doped SrTiO 3 .…”

“…Then, co‐loading of the second co‐catalyst was introduced for the effective progress of the O 2 evolution reaction over the Rh 0.7 Cr 1.3 O 3 /BaTi 4 O 9 photcatalyst. According to the previous study, here, CoO x was applied as the second co‐catalyst and overall H 2 O splitting was carried out . The result is shown in Figure (b).…”

“…In addition, the value of the AQY of Rh 0.7 Cr 1.3 O 3 (Rh:0.3 wt%)/BaTi 4 O 9 (SSR)/CoO x (0.1 wt%) is assessed at one of high AQY values of the photocatalytic overall H 2 O splitting. In most cases, such a high AQY of the photocatalytic overall H 2 O splitting was achieved by the modification of the bulk of photocatalyst, such as doping of metal ions, with combining highly functional cocatalyst, such as Rh y Cr 2‐y O 3 …”