Hydrogen Generation over RuO 2 Nanoparticle-Decorated LaNaTaO 3 Perovskite Photocatalysts under UV Exposure.

The efficacy of LaNaTaO ₃ perovskites decoration RuO ₂ at diverse contents for the photocatalytic H ₂ generation has been explored in this study. The photocatalytic performance of RuO ₂ co-catalyst onto mesoporous LaNaTaO ₃ was evaluated for H ₂ under UV illumination. 3%RuO ₂ /LaNaTaO ₃ perovskite photocatalyst revealed the highest photocatalytic H ₂ generation performance, indicating that RuO ₂ nanoparticles could promote the photocatalytic efficiency of LaNaTaO ₃ perovskite significantly. The H ₂ evolution rate of 3%RuO ₂ /LaNaTaO ₃ perovskite is 11.6 and 1.3 times greater than that of bare LaNaTaO ₃ perovskite employing either 10% CH ₃ OH or pure H ₂ O, respectively. Interestingly, the photonic efficiency of 3%RuO ₂ /LaNaTaO ₃ perovskite was enhanced 10 times than LaNaTaO ₃ perovskite in the presence of aqueous CH ₃ OH solutions as a hole sacrificial agent. The high separation of charge carriers is interpreted by the efficient hole capture using CH ₃ OH, hence leading to greater H ₂ generation over RuO ₂ /LaNaTaO ₃ perovskites. This is attributed to an adjustment position between recombination electron-hole pairs and also the reduction of potential conduction alignment as a result of RuO ₂ incorporation. The suggested mechanisms of RuO ₂ /LaNaTaO ₃ perovskites for H ₂ generation employing either CH ₃ OH or pure H ₂ O were discussed. The photocatalytic performances of the perovskite photocatalyst were elucidated according to the PL intensity and the photocurrent response investigations.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)