Despite intense efforts during the past decades, most of the existing photocatalysts suffer from low solar energy conversion efficiency. Herein, we examine the photocatalytic mechanism of water splitting on Pt/TiO₂ catalysts using in situ solid-state NMR and electron spin resonance (ESR) spectroscopy. The experimental results demonstrate that the formation of H₂ and O₂⁻ and the subsequent oxidization of surface molecules by O₂⁻ all occur on the co-catalyst Pt. It is inevitable that in the absence of sacrifice reagent, the O₂⁻ would consume neighboring H₂ to regenerate H₂O in the traditional method. Accordingly, we propose a new strategy for the photolysis of pure water by controlling water loading on the surface of TiO₂, which can hinder H₂ to interact with O₂⁻ to regenerate H₂O. The efficiency of the strategy can reach ∼560 μmol H₂/g/h, and the overall solar energy conversion efficiency is determined to be ∼0.46%, while those of the traditional method are negligible.

尽管在过去的几十年中付出了巨大的努力，但是大多数现有的光催化剂都具有太阳能转换效率低的缺点。本文中，我们使用原位固态NMR和电子自旋共振（ESR）光谱研究了Pt / TiO ₂催化剂上水分解的光催化机理。实验结果表明，H的形成₂和O ₂ ^-和被O表面分子的后续氧化₂ ^-所有发生在助催化剂的Pt。这是不可避免的，在没有牺牲试剂时，O ₂ ^-将消耗相邻ħ ₂再生ħ ₂传统方法中的O。因此，我们由二氧化钛表面上控制水的装载提出的纯净水的光解的新战略₂，它可以阻碍^ h ₂到带O交互₂ ^-再生^ h ₂ O.战略的效率可以达到~560 μmolH ₂ / g / h，总的太阳能转化效率约为0.46％，而传统方法则可以忽略不计。