Boosting Photocatalytic Activity in Cross‐Coupling Reactions by Constructing Pd‐Oxide Heterostructures. Issue 6 (6th April 2020)

• Record Type: Journal Article
• Authors: Wu, Di; Li, Zheyue; Qi, Zeming; Hu, Shanwei; Long, Ran; Song, Li; Xiong, Yujie
• Is Part Of: ChemNanoMat. Volume 6:Issue 6(2020)
• Page Start: 920
• Page End: 924
• Publication Date: 2020-04-06
• Subjects: palladium nanocrystal -- photocatalysis -- coupling reaction -- charge transfer -- radical intermediate; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.202000123
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: 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. Abstract : Palladium nanocrystals supported on oxides were systematically investigated to reveal their catalytic mechanism in cross‐coupling reactions under light illumination. The results indicate that electron density control and radical intermediate process are responsible for the boosting catalytic activity with the aid of energetic light.