title: High-performance ZnCo₂O₄@CeO2₂₄ core@shell microspheres for catalytic CO oxidation.
abstract: In this paper, we report a self-assembly method to synthesize high-quality ZnCo2O4@CeO2 core@shell microspheres with tunable CeO2 thickness. ZnCo2O4 spheres were first synthesized as the core, followed by a controlled CeO2 shell coating process. The thickness of CeO2 shell could be easily tuned by varying the feeding molar ratio of Ce/Co. Transmission electron microscope (TEM) images and scanning transmission electron microscope (STEM) image have identified the core@shell structure of these samples. In CO oxidation tests these ZnCo2O4@CeO2 core@shell microspheres exhibited promising catalytic performance, and the catalytic activity of the best sample is even close to the traditional noble metal-CeO2 system, attaining 100% CO conversion at a relatively low temperature of 200 °C. Cycling tests confirm their good stability of these core@shell microspheres besides activity. Their high catalytic performance should be attributed to the core@shell structure formation, and moreover further H2-temperature-programmed reduction (TPR) results revealed the possible synergistic effects between the two components of ZnCo2O4 and CeO2.
authors.affiliation: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022 Jilin, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Xiao
authors.initials: X
authors.lastname: Wang
authors.forename: Dapeng
authors.initials: D
authors.lastname: Liu
authors.forename: Jiangman
authors.initials: J
authors.lastname: Zhen
authors.forename: Junqi
authors.initials: J
authors.lastname: Li
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Wang
authors.forename: Hongjie
authors.initials: H
authors.lastname: Zhang
keywords: CO oxidation; CeO2; ZnCo2O4; core@shell; microspheres