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Wu K, Fu XP, Yu WZ, Wang WW, Jia CJ, Du PP, Si R, Wang YH, Li LD, Zhou L, Sun LD, Yan CH. Pt-Embedded CuO x-CeO 2 Multicore-Shell Composites: Interfacial Redox Reaction-Directed Synthesis and Composition-Dependent Performance for CO Oxidation. ACS Appl Mater Interfaces 2018; 10:34172-34183. [PMID: 30205674 DOI: 10.1021/acsami.8b10496] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Exploring the state-of-the-art heterogeneous catalysts has been a general concern for sustainable and clean energy. Here, Pt-embedded CuO x-CeO2 multicore-shell (Pt/CuO x-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/CuO x-CeO2 MS composites are derived from an interfacial autoredox process, where Pt nanoparticles (NPs) are in situ encapsulated by self-assembled ceria nanospheres with CuO x clusters adhered through deposition/precipitation-calcination process. Only Cu-O and Pt-Pt coordination structures are determined for CuO x clusters and Pt NPs in Pt/CuO x-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 CuO x 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 Ptδ+-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/CuO x-CeO2 MS composites, respectively, which are both deleterious to catalytic reactivity. As a result, the composition-dependent catalytic activity and superior durability of Pt/CuO x-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.
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Affiliation(s)
- Ke Wu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Xin-Pu Fu
- Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Wen-Zhu Yu
- Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Wei-Wei Wang
- Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Chun-Jiang Jia
- Key Laboratory for Colloid and Interface Chemistry, Key Laboratory of Special Aggregated Materials, School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , China
| | - Pei-Pei Du
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201204 , China
| | - Rui Si
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201204 , China
| | - Yu-Hao Wang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Lin-Dong Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Liang Zhou
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Ling-Dong Sun
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Chun-Hua Yan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, and College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
- College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , China
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