Visible light absorption peak from near-field dielectric scattering was observed in case of Pt nanoparticles directly supported on P25. This absorbed scattered light could drive visible-light photocatalytic pure water splitting (λ>420 nm). It is interesting that the roles of Pt and P25 in photocatalytic hydrogen generation were switchable under different irradiation conditions. Under UV–vis irradiation, P25 represented a photocatalyst while Pt was cocatalyst. Under visible light irradiation (λ>420 nm), Pt would prefer to act as a photocatalyst while P25 was analogous to cocatalyst. Moreover, defects (Ti³⁺ or V_O) on the surface of Pt/P25 would be generated under UV irradiation. These defects are similar with a sacrificial agent to consume photogenerated holes, which are necessary for visible-light-drive photocatalytic pure water splitting.

在Pt纳米颗粒直接负载在P25上的情况下，观察到了来自近场电介质散射的可见光吸收峰。被吸收的散射光可以驱动可见光光催化纯水分裂（λ> 420 nm）。有趣的是，Pt和P25在光催化制氢中的作用在不同的照射条件下是可切换的。在紫外可见辐射下，P25代表光催化剂，而Pt是助催化剂。在可见光照射下（λ> 420 nm），Pt更愿意充当光催化剂，而P25与助催化剂类似。此外，缺陷（Ti ³⁺或V _O在紫外线照射下会在Pt / P25的表面生成）。这些缺陷与牺牲剂消耗光生空穴相似，这对于可见光驱动的光催化纯水分解是必需的。