The design of heterogeneous photocatalysts for organic synthesis has attracted great attention for achieving enhanced catalytic performance under light illumination. However, the effects of photocatalytic processes on organic reactions are quite complicated. In this work, we construct a series of Pd‐oxide heterostructures and then evaluate their catalytic performances on cross‐coupling reactions. The investigation results reveal that the conduction type of the oxide supports critically influences the catalytic efficiency via charge density control of metallic sites. In general, an n‐type semiconductor enhances the catalytic performance while a p‐type reduces the catalytic activity in the presence of suitable illumination conditions. Further investigation on the Pd tetrahedron‐TiO₂ nanosheet hybrid structure reveals that Heck reactions take place via a radical intermediate mechanism in the presence of light, leading to a significant increase in the catalytic performance.

中文翻译：

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通过构建Pd-氧化物异质结构提高交叉偶联反应中的光催化活性

用于有机合成的非均相光催化剂的设计引起了极大的关注，以在光照下实现增强的催化性能。但是，光催化过程对有机反应的影响非常复杂。在这项工作中，我们构建了一系列的Pd-氧化物异质结构，然后评估它们在交叉偶联反应中的催化性能。研究结果表明，氧化物的导电类型通过金属位的电荷密度控制严重影响催化效率。通常，在合适的照明条件下，n型半导体可增强催化性能，而ap型可降低催化活性。Pd四面体-TiO _2的进一步研究 纳米片的杂化结构表明，在存在光的情况下，Heck反应通过自由基中间机理发生，从而导致催化性能的显着提高。