文献类型：期刊文献

英文题名：Mixed-valence palladium single-atom catalyst induced by hybrid TiO2-graphene through a photochemical strategy

作者：Du, Kui[1,2];Sun, Minghao[3];Peng, Jiehai[2];Zhou, Shaodong[3];Sheng, Guodong[1];Shen, Runpu[1];Deng, Liping[1];Hu, Chunqi[1];Sun, Yue[4];Zhang, Pengfei[2]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China;[2]Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 310016, Peoples R China;[3]Zhejiang Univ, Coll Chem & Biochem Engn, Zhejiang Prov Key Lab Adv Chem Engn Manufacture Te, Hangzhou 310027, Peoples R China;[4]Tiangong Univ, Dept Chem, Tianjin, Peoples R China

年份：2023

卷号：625

外文期刊名：APPLIED SURFACE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000980034300001)、、EI(收录号：20231513868357)、Scopus(收录号：2-s2.0-85151762449)、WOS

基金：This work was financially supported by the National Natural Science Foundation of China (No. 21871071) , Ten thousand people plan of Zhejiang Province (No. 2019R51012) for P.Z. and the National Natural Science Foundation of China (21878265) for S.Z.

语种：英文

外文关键词：TiO2; graphene; Single-atom catalysts; Mixed-valence; Photochemical strategy; C-C coupling reaction

外文摘要：Heterogeneous Pd single-atom catalysts (Pd SACs) have demonstrated high efficiency in C-C coupling reactions, which are considered the cornerstones of organic synthesis. However, the development of 2D materials for the evaluation of the catalytic efficiency of mixed-valence Pd SACs remains a significant challenge. In this study, we prepared various mixed-valence Pd SACs via photodeposition. The electronic structure and dispersion state of the surface Pd species were confirmed. The important role of graphene oxide in the design of atomically dispersed Pd species was further confirmed through comparative experiments with Pd/TiO2. The mixed-valence Pd SACs exhibited excellent catalytic activity for the typical palladium-catalyzed Suzuki and Sonogashira C-C coupling. Theoretical calculations and EXAFS spectra were used to determine the mechanism for tailoring the Pd0/Pd2+ atomic ratios. These studies initiate a broad portfolio of mixed-valence metal-based single-atom catalysts (SACs).