标题：Pt-Embedded CuOx-CeO2 Multicore-Shell Composites: Interfacial Redox Reaction-Directed Synthesis and Composition-Dependent Performance for CO Oxidation
作者：Wu, Ke; Fu, Xin-Pu; Yu, Wen-Zhu; Wang, Wei-Wei; Jia, Chun-Jiang; Du, Pei-Pei; Si, Rui; Wang, Yu-Hao; Li, Lin-Dong; Zhou, Liang; Su 更多 作者机构：[Wu, Ke; Wang, Yu-Hao; Li, Lin-Dong; Zhou, Liang; Sun, Ling-Dong; Yan, Chun-Hua] Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat C 更多
通讯作者：Sun, LD;Yan, CH;Sun, LD;Yan, CH;Jia, CJ;Yan, CH;Jia, ChunJiang
通讯作者地址：[Sun, LD; Yan, CH]Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan C 更多
来源：ACS APPLIED MATERIALS & INTERFACES
关键词：Pt embedded CuOx-CeO2 catalyst; interfacial redox reaction; CO; oxidation; synergistic catalysis mechanism; metal-support interaction
摘要：Exploring the state-of-the-art heterogeneous catalysts has been a general concern for sustainable and clean energy. Here, Pt-embedded CuOx-CeO2 multicore-shell (Pt/CuOx-CeO2 MS) composites are fabricated at room temperature via a one-pot and template free procedure for catalyzing CO oxidation, a classical probe reaction, showing a volcano-shaped relationship between the composition and catalytic activity. We experimentally unravel that the Pt/CuOx-CeO2 MS composites are derived from an interfacial autoredox process, where Pt nanoparticles (NPs) are in situ encapsulated by self-assembled ceria nanospheres with CuOx clusters adhered through deposition/precipitation calcination process. Only Cu-O and Pt-Pt coordination structures are determined for CuOx clusters and Pt NPs in Pt/CuOx-CeO2 MS, respectively. Importantly, the close vicinity between Pt and CeO2 benefits to more oxygen vacancies in CeO2 counterparts and results in thin oxide layers on Pt NPs. Meanwhile, the introduction of CuOx clusters is crucial for triggering synergistic catalysis, which leads to high resistance to aggregation of Pt NPs and improvement of catalytic performance. In CO oxidation reaction, both Pt delta+-CO and Cu+-CO can act as active sites during CO adsorption and activation. Nonetheless, redundant content of Pt or Cu will induce a strongly bound Pt-O-Ce or Cu-[O-x]-Ce structures in air-calcinated Pt/CuOx-CeO2 MS composites, respectively, which are both deleterious to catalytic reactivity. As a result, the composition-dependent catalytic activity and superior durability of Pt/CuOx-CeO2 MS composites toward CO oxidation reaction are achieved. This work should be instructive for fabricating desirable multicomponent catalysts composed of noble metal and bimetallic oxide composites for diverse heterogeneous catalysis.