Developing new renewable, carbon-neutral fuels to diminish the amount of released CO₂ in the atmosphere and to solve global challenges such as global warming and climate change is significant. Among them, hydrogen (H₂) is attracting much attention due to its high energy density, ease of transportation, and multiple means of production. To meet the global demand of H_2, photocatalytic water splitting is one of the most promising methods for large scale production. Herein, Al-doped SrTiO₃ photocatalyst (Al–SrTiO₃) was prepared by a molten flux method. Then, plasmonic metal nanoparticles (Au, Cu, Pt), and cocatalysts Rh/Cr₂O₃ and CoOOH were selectively deposited onto the reductive and oxidative active sites of Al–SrTiO₃ using multi-step photodeposition-impregnation methods for water splitting and H₂ production under UV-rays, UV–Vis. Light, and visible light (λ ≥ 400 nm). Our results showed that, compared with Pt and Cu loaded Al–SrTiO₃ photocatalyst supported with Rh/Cr₂O₃ and CoOOH cocatalysts, Au-loaded samples showed the highest H₂ production efficiency under both UV (920 μmol/h - EQE = 41% at 365 nm) and UV–Vis (100.5 μmol/h) rays. In addition, the amount of evolved H₂ decreased by increasing the weight ratio of Au nanoparticles (NPs) due to the overlap between Au NPs and Rh/Cr₂O₃ cocatalyst. Although Au 0.3 wt%-loaded sample showed high activity under both UV and UV–Vis. Rays, it exhibited almost no efficiency under visible light because of the large bandgap of Al–SrTiO₃ (3.1 eV) and the poor absorption in the visible region. Visible light absorption was then enhanced by increasing the loaded amount of Au NPs and by separating Au NPs and Rh/Cr₂O₃ cocatalyst responsible for H₂ evolution by combining both photodeposition and impregnation methods. Under visible light, Rh/Cr₂O₃-loaded Al–SrTiO₃ with 4 wt % Au NPs showed the highest H₂ evolution efficiency (41 μmol/3 h). This was attributed to the efficient hot electron transfer from Au NPs to Al–SrTiO₃ then to RhCr₂O₃, resulting in charge separation needed for efficient H₂ generation.

开发新的可再生碳中和燃料以减少大气中释放的 CO ₂量并解决全球变暖和气候变化等全球挑战具有重要意义。其中，氢（H ₂）因其能量密度高、运输方便、生产方式多样等优点而备受关注。为满足全球对H _{2 的需求，}光催化水分解是最有前景的大规模生产方法之一。在此，Al掺杂的SrTiO ₃光催化剂（Al-SrTiO ₃）通过熔融焊剂法制备。然后，等离子金属纳米粒子（Au、Cu、Pt）和助催化剂 Rh/Cr ₂ O ₃采用多步光沉积-浸渍法，在紫外线、UV-Vis 下将CoOOH 和 CoOOH 选择性沉积到 Al-SrTiO _{3的还原和氧化活性位点上，用于水分解和 H 2生成。}光和可见光 (λ ≥ 400 nm)。我们的结果表明，与负载铂和铜的 Al-SrTiO ₃光催化剂负载的 Rh/Cr ₂ O ₃和 CoOOH 助催化剂相比，负载 Au 的样品在两种紫外光下均表现出最高的 H ₂生产效率（920 μmol/h - EQE = 41% at 365 nm) 和 UV-Vis (100.5 μmol/h) 射线。此外，析出的H _{2由于 Au NPs 和 Rh/Cr 2} O ₃助催化剂之间的重叠，通过增加 Au 纳米颗粒 (NPs) 的重量比而降低。尽管负载 Au 0.3 wt% 的样品在 UV 和 UV-Vis 下均显示出高活性。射线，它在可见光下几乎没有表现出效率，因为 Al-SrTiO ₃的带隙大（3.1 eV）和可见光区域的吸收差。然后通过增加 Au NPs 的负载量和通过结合光沉积和浸渍方法分离 Au NPs 和负责 H _{2释放的 Rh/Cr 2} O ₃助催化剂来增强可见光吸收。可见光下，负载Rh/Cr ₂ O ₃的Al-SrTiO_{具有 4 wt% Au NPs 的图3}显示出最高的 H ₂释放效率（41 μmol/3 h）。这归因于从Au NPs 到Al-SrTiO ₃再到RhCr ₂ O _{3的有效热电子转移，导致有效H 2}生成所需的电荷分离。