Photocatalytic water splitting for the production of H₂ and the reduction of CO₂ into carbon compounds via solar energy exhibits possible widespread applications in the energy sector because of their application as so-called solar fuels. However, so far, the efficiency of these processes is low and in need of further improvement. Herein, we report a strategy for boosting the solar fuel generation rate of TiO₂ by loading cocatalysts, specifically bimetallic Cu–Pt and CuO, via two-step photodeposition processes. Intriguingly, we can for the first time observe that the Cu₂O nanoparticles present on the surface of TiO₂ are partially redissolved into the solution because of the weak acidity induced by the Pt precursor. The sample of Cu–Pt/TiO₂–CuO shows a photocatalytic H₂ generation rate of 173.7 μmol/g·h under simulated sunlight conditions. For the photocatalytic CO₂ reduction by water, the sample of Cu–Pt/TiO₂–CuO shows the release of H₂, O₂, CO, CH₄, and CH₃OH, whereby CO is the main reaction product. Typically, the yields of O₂ and CO are 4.2 and 6.2 and 2.1 and 3.2 μmol/h·g under LED-405 and LED-425, respectively; the CO₂-to-CO conversion ratios with respect to separated carriers are 73.8 and 76.19%.

中文翻译：

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TiO ₂光催化生产太阳能双金属Pt-Cu助催化剂的光沉积合成

用于生产H _2的光催化水分解和通过太阳能将CO ₂还原为碳化合物的方法因其作为所谓的太阳能燃料而在能源领域显示出广泛的应用。但是，到目前为止，这些过程的效率很低，需要进一步改进。在本文中，我们报告了一种通过两步光沉积工艺，通过负载助催化剂（特别是双金属Cu-Pt和CuO）来提高TiO ₂太阳能发电率的策略。有趣的是，我们可以首次观察到TiO ₂表面上存在Cu ₂ O纳米颗粒由于Pt前体所引起的弱酸度，它们部分重新溶解在溶液中。Cu-Pt / TiO ₂ -CuO样品在模拟的阳光条件下显示出173.7μmol / g·h的光催化H ₂生成速率。对于用水进行光催化还原CO ₂，Cu–Pt / TiO ₂ –CuO样品显示出H ₂，O ₂，CO，CH ₄和CH ₃ OH的释放，其中CO是主要反应产物。通常，在LED-405和LED-425下，O ₂和CO的产率分别为4.2和6.2和2.1和3.2μmol/ h·g；一氧化碳₂相对于分离的载流子，CO转化为CO的比率为73.8％和76.19％。