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Li G, Wu B, Li L. Surface-structure effect of nano-crystalline CeO 2 support on low temperature CO oxidation. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.08.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tang K, Liu W, Li J, Guo J, Zhang J, Wang S, Niu S, Yang Y. The Effect of Exposed Facets of Ceria to the Nickel Species in Nickel-Ceria Catalysts and Their Performance in a NO + CO Reaction. ACS APPLIED MATERIALS & INTERFACES 2015; 7:26839-26849. [PMID: 26573213 DOI: 10.1021/acsami.5b09110] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
CeO2 rods with {110} facets and cubes with {100} facets were utilized as catalyst supports to probe the effect of crystallographic facets on the nickel species and the structure-dependent catalytic performance. Various analysis methods (ex and in situ XRD, TEM, Raman, XPS, TPR, TPD) were used to investigate the structural forms of the catalysts, and these results indicated that the deposition of nickel species resulted in the formation of two main active types of the catalyst components: NiO strongly or weakly interacted with the surface and Ni-Ce-O solid solution. Notably, the states and distribution ratio of nickel species were related to the shape of CeO2. It was found that CeO2 rods had more active sites to coordinate with nickel species to form a strong interaction with NiO on the surface and a more stable construction when compared to cubes. Furthermore, the nickel-ceria catalysts with rod shape were more active towards NO oxidation with complete conversion below 191 °C, but for cube shape, complete conversion occurred above 229 °C (e.g., for nickel loading of ∼5%, the complete conversion temperature was 154 °C for the rod shape and 229 °C for the cube shape). On the basis of the analysis of the catalysts structure, the superior catalytic activity was due to a combination of surface structures of NiO (mainly strongly interacting with the surface) and nickel ions Ni(2+) in the Ni-Ce-O bulk phase.
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Affiliation(s)
- Ke Tang
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Wei Liu
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Jing Li
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Jinxin Guo
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Jingcai Zhang
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Shuping Wang
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
| | - Shengli Niu
- School of Energy and Power Engineering, Shandong University , Jinan, 250061, P. R. China
| | - Yanzhao Yang
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University , Jinan, 250100, P. R. China
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Lei W, Zhang T, Gu L, Liu P, Rodriguez JA, Liu G, Liu M. Surface-Structure Sensitivity of CeO2 Nanocrystals in Photocatalysis and Enhancing the Reactivity with Nanogold. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00620] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wanying Lei
- National Center
for Nanoscience and Technology, Beijing 100190, China
| | - Tingting Zhang
- National Center
for Nanoscience and Technology, Beijing 100190, China
| | - Lin Gu
- Beijing
National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Ping Liu
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - José A. Rodriguez
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Gang Liu
- National Center
for Nanoscience and Technology, Beijing 100190, China
| | - Minghua Liu
- National Center
for Nanoscience and Technology, Beijing 100190, China
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Zhang T, Lei W, Liu P, Rodriguez JA, Yu J, Qi Y, Liu G, Liu M. Insights into the structure-photoreactivity relationships in well-defined perovskite ferroelectric KNbO 3 nanowires. Chem Sci 2015; 6:4118-4123. [PMID: 29218178 PMCID: PMC5707469 DOI: 10.1039/c5sc00766f] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/23/2015] [Indexed: 11/26/2022] Open
Abstract
1D perovskite-type orthorhombic KNbO3 nanowires display RhB photodegradation about two-fold as large as their monoclinic counterparts and a synergy between ferroelectric polarization and electronic structure in photoreactivity enhancement is uncovered.
Structure–function correlations are a central theme in heterogeneous (photo)catalysis. In this study, the geometric and electronic structure of perovskite ferroelectric KNbO3 nanowires with respective orthorhombic and monoclinic polymorphs have been systematically addressed. By virtue of aberration-corrected scanning transmission electron microscopy, we directly visualize surface photocatalytic active sites, measure local atomic displacements at an accuracy of several picometers, and quantify ferroelectric polarization combined with first-principles calculations. The photoreactivity of the as-prepared KNbO3 nanowires is assessed toward aqueous rhodamine B degradation under UV light. A synergy between the ferroelectric polarization and electronic structure in photoreactivity enhancement is uncovered, which accounts for the prominent reactivity order: orthorhombic > monoclinic. Additionally, by identifying new photocatalytic products, rhodamine B degradation pathways involving N-deethylation and conjugated structure cleavage are proposed. Our findings not only provide new insights into the structure–photoreactivity relationships in perovskite ferroelectric photocatalysts, but also have broad implications in perovskite-based water splitting and photovoltaics, among others.
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Affiliation(s)
- Tingting Zhang
- National Center for Nanoscience and Technology , Beijing 100190 , China . ; .,Institute of Materials Physics and Chemistry , School of Sciences , Northeastern University , Shenyang 110004 , China
| | - Wanying Lei
- National Center for Nanoscience and Technology , Beijing 100190 , China . ;
| | - Ping Liu
- Chemistry Department , Brookhaven National Laboratory , Upton , New York 11973 , USA
| | - José A Rodriguez
- Chemistry Department , Brookhaven National Laboratory , Upton , New York 11973 , USA
| | - Jiaguo Yu
- State Key Laboratory of Advance Technology for Material Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , China
| | - Yang Qi
- Institute of Materials Physics and Chemistry , School of Sciences , Northeastern University , Shenyang 110004 , China
| | - Gang Liu
- National Center for Nanoscience and Technology , Beijing 100190 , China . ;
| | - Minghua Liu
- National Center for Nanoscience and Technology , Beijing 100190 , China . ;
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