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Wang H, Gao C, Wang R, Yuan J, Zhou B, Si W, Li J, Peng Y. Influence of Oxygen Vacancy-Induced Coordination Change on Pd/CeO 2 for NO Reduction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:2133-2143. [PMID: 38237035 DOI: 10.1021/acs.est.3c08582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
The byproduct formation in environmental catalysis is strongly influenced by the chemical state and coordination of catalysts. Herein, two Pd/CeO2 catalysts (PdCe-350 and PdCe-800) with varying oxygen vacancies (Ov) and coordination numbers (CN) of Pd were prepared to investigate the mechanism of N2O and NH3 formation during NO reduction by CO. PdCe-350 exhibits a higher density of Ov and Pd sites with higher CN, leading to an enhanced metal-support interaction by electron transformation from the support to Pd. Consequently, PdCe-350 displayed increased levels of byproduct formation. In situ spectroscopies under dry and wet conditions revealed that at low temperatures, the N2O formation strongly correlated with the Ov density through the decomposition of chelating nitro species on PdCe-350. Conversely, at high temperatures, it was linked to the reactivity of Pd species, primarily facilitated by monodentate nitrates on PdCe-800. In terms of NH3 formation, its occurrence was closely associated with the activation of H2O and C3H6, since a water-gas shift or hydrocarbon reforming could provide hydrogen. Both bridging and monodentate nitrates showed activity in NH3 formation, while hyponitrites were identified as key intermediates for both catalysts. The insights provide a fundamental understanding of the intricate relationship among the local coordination of Pd, surface Ov, and byproduct distribution.
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Affiliation(s)
- Houlin Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Chuan Gao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Rong Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jin Yuan
- College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
| | - Bin Zhou
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Wenzhe Si
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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2
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Sun Y, Xie J, Fu Z, Zhang H, Yao Y, Zhou Y, Wang X, Wang S, Gao X, Tang Z, Li S, Wang X, Nie K, Yang Z, Yan Y. Boosting CO 2 Electroreduction to C 2H 4 via Unconventional Hybridization: High-Order Ce 4+ 4f and O 2p Interaction in Ce-Cu 2O for Stabilizing Cu . ACS NANO 2023. [PMID: 37410800 DOI: 10.1021/acsnano.3c03952] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
Efficient conversion of carbon dioxide (CO2) into value-added materials and feedstocks, powered by renewable electricity, presents a promising strategy to reduce greenhouse gas emissions and close the anthropogenic carbon loop. Recently, there has been intense interest in Cu2O-based catalysts for the CO2 reduction reaction (CO2RR), owing to their capabilities in enhancing C-C coupling. However, the electrochemical instability of Cu+ in Cu2O leads to its inevitable reduction to Cu0, resulting in poor selectivity for C2+ products. Herein, we propose an unconventional and feasible strategy for stabilizing Cu+ through the construction of a Ce4+ 4f-O 2p-Cu+ 3d network structure in Ce-Cu2O. Experimental results and theoretical calculations confirm that the unconventional orbital hybridization near Ef based on the high-order Ce4+ 4f and 2p can more effectively inhibit the leaching of lattice oxygen, thereby stabilizing Cu+ in Ce-Cu2O, compared with traditional d-p hybridization. Compared to pure Cu2O, the Ce-Cu2O catalyst increased the ratio of C2H4/CO by 1.69-fold during the CO2RR at -1.3 V. Furthermore, in situ and ex situ spectroscopic techniques were utilized to track the oxidation valency of copper under CO2RR conditions with time resolution, identifying the well-maintained Cu+ species in the Ce-Cu2O catalyst. This work not only presents an avenue to CO2RR catalyst design involving the high-order 4f and 2p orbital hybridization but also provides deep insights into the metal-oxidation-state-dependent selectivity of catalysts.
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Affiliation(s)
- Yanfei Sun
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Jiangzhou Xie
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Zhenzhen Fu
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Huiying Zhang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yebo Yao
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yixiang Zhou
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Xiaoxuan Wang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Shiyu Wang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Xueying Gao
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Zheng Tang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Shuyuan Li
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Xiaojun Wang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Kaiqi Nie
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Zhiyu Yang
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yiming Yan
- State Key Lab of Organic-Inorganic Composites, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
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3
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Effect of doping of iron on structural, optical and magnetic properties of CeO2 nanoparticles. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.140110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Ko W, Kim JH, Yim GH, Lee SC, Kim S, Kwak M, Choi H, Kim J, Hooch Antink W, Kim J, Lee CW, Bok J, Jung Y, Lee E, Lee KS, Cho SP, Kim DH, Kim YG, Lee BH, Hyeon T, Yoo D. Controlling Multiple Active Sites on Pd‐CeO2 for Sequential C‐C Cross‐coupling and Alcohol Oxidation in One Reaction System. ChemCatChem 2021. [DOI: 10.1002/cctc.202101760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Wonjae Ko
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Ju Hee Kim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Guk Hee Yim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Seong Chan Lee
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Sumin Kim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Minjoon Kwak
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Hyunwoo Choi
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Jongchan Kim
- Seoul National University School of Chemical and Biological Engineering 08826 Seoul KOREA, REPUBLIC OF
| | - Wytse Hooch Antink
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Jiheon Kim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Chan Woo Lee
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Jinsol Bok
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Yoon Jung
- Seoul National University School of Chemical and Biological Engineering 08826 Seoul KOREA, REPUBLIC OF
| | - Eunwon Lee
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Kug-Seung Lee
- Pohang Accelerator Laboratory Beamline Department 80, Jigok-ro 127beon-gil, Nam-gu 37673 Pohang KOREA, REPUBLIC OF
| | - Sung-Pyo Cho
- Seoul National University National Center for Inter-University Research Facilities 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Do Heui Kim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Young Gyu Kim
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Byoung-Hoon Lee
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Taeghwan Hyeon
- Seoul National University School of Chemical and Biological Engineering 599 Gwanangno, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
| | - Dongwon Yoo
- Seoul National University School of Chemical and Biological Engineering 1, Gwanak-ro, Gwanak-gu 08826 Seoul KOREA, REPUBLIC OF
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5
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Cao H, Guo H, Shao YC, Liu Q, Feng X, Lu Q, Wang Z, Zhao A, Fujimori A, Chuang YD, Zhou H, Zhai X. Realization of Electron Antidoping by Modulating the Breathing Distortion in BaBiO 3. NANO LETTERS 2021; 21:3981-3988. [PMID: 33886344 DOI: 10.1021/acs.nanolett.1c00750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The recent proposal of antidoping scheme breaks new ground in conceiving conversely functional materials and devices; yet, the few available examples belong to the correlated electron systems. Here, we demonstrate both theoretically and experimentally that the main group oxide BaBiO3 is a model system for antidoping using oxygen vacancies. The first-principles calculations show that the band gap systematically increases due to the strongly enhanced Bi-O breathing distortions away from the vacancies and the annihilation of Bi 6s/O 2p hybridized conduction bands near the vacancies. Our further spectroscopic experiments confirm that the band gap increases systematically with electron doping, with a maximal gap enhancement of ∼75% when the film's stoichiometry is reduced to BaBiO2.75. These results unambiguously demonstrate the remarkable antidoping effect in a material without strong electron correlations and underscores the importance of bond disproportionation in realizing such an effect.
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Affiliation(s)
- Hui Cao
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hongli Guo
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Yu-Cheng Shao
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | | | - Xuefei Feng
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States
| | | | | | - Aidi Zhao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Atsushi Fujimori
- Department of Applied Physics, Waseda University, Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yi-De Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Xiaofang Zhai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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6
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Yadav AN, Bindra JK, Jakhar N, Singh K. Switching-on superparamagnetism in diluted magnetic Fe( iii) doped CdSe quantum dots. CrystEngComm 2020. [DOI: 10.1039/c9ce01391a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chemically prepared, 0.5% Fe(iii)-doped CdSe QDs exhibit superparamagnetism with weak ferromagnetic exchange interaction.
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Affiliation(s)
- Amar Nath Yadav
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi-110067
- India
| | - Jasleen K. Bindra
- Department of Chemistry and Biochemistry
- Florida State University
- Tallahassee
- USA
- National High Magnetic Field Laboratory
| | - Narendra Jakhar
- Department of Physics
- University of Rajasthan
- Jaipur-302004
- India
| | - Kedar Singh
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi-110067
- India
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7
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Cheng X, Huang L, Yang X, Elzatahry AA, Alghamdi A, Deng Y. Rational design of a stable peroxidase mimic for colorimetric detection of H2O2 and glucose: A synergistic CeO2/Zeolite Y nanocomposite. J Colloid Interface Sci 2019; 535:425-435. [DOI: 10.1016/j.jcis.2018.09.101] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 09/28/2018] [Accepted: 09/28/2018] [Indexed: 01/02/2023]
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8
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Ju TJ, Wang CH, Lin SD. Insights into the CO2 deoxygenation to CO over oxygen vacancies of CeO2. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00111e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The reversibly regenerated oxygen vacancies of CeO2 can catalyze CO2 deoxygenation and the reaction is initially surface reaction limited.
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Affiliation(s)
- Tz-Jie Ju
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei 106
- Taiwan
| | - Chi-Han Wang
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei 106
- Taiwan
| | - Shawn D. Lin
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
- Taipei 106
- Taiwan
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9
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Brackmann R, Toniolo FS, dos Santos Filho E, Alves OC, de Souza Gomes ÂM, Woyames CB, Schmal M. Characterization of CeO2–Fe2O3 Mixed Oxides: Influence of the Dopant on the Structure. Top Catal 2018. [DOI: 10.1007/s11244-018-1031-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Tan S, Li D. Enhancing Oxygen Storage Capability and Catalytic Activity of Lanthanum Oxysulfide (La2
O2
S) Nanocatalysts by Sodium and Iron/Sodium Doping. ChemCatChem 2017. [DOI: 10.1002/cctc.201701117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shuai Tan
- Department of Chemical Engineering; University of Wyoming; 1000 E, University Ave Laramie WY 82071 USA
| | - Dongmei Li
- Department of Chemical Engineering; University of Wyoming; 1000 E, University Ave Laramie WY 82071 USA
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11
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Chubar N, Gerda V, Banerjee D, Yablokova G. Effect of Fe(II)/Ce(III) dosage ratio on the structure and anion adsorptive removal of hydrothermally precipitated composites: Insights from EXAFS/XANES, XRD and FTIR. J Colloid Interface Sci 2017; 487:388-400. [DOI: 10.1016/j.jcis.2016.10.060] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 10/07/2016] [Accepted: 10/22/2016] [Indexed: 11/28/2022]
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12
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Sharma A, Varshney M, Shin HJ, Chae KH, Won SO. Investigation on cation distribution and luminescence in spinel phase γ-Ga3−δO4 : Sm nanostructures using X-ray absorption spectroscopy. RSC Adv 2017. [DOI: 10.1039/c7ra10341g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In this study, spectroscopic investigations are employed to quantify the Ga distribution over the tetrahedral/octahedral sites and to assimilate the luminescence properties in the barely reported γ-Ga2.67O4 : Sm nanoparticles.
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Affiliation(s)
- Aditya Sharma
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Mayora Varshney
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Hyun-Joon Shin
- Pohang Accelerator Laboratory (POSTECH)
- Pohang-37673
- South Korea
| | - Keun Hwa Chae
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Sung Ok Won
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
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13
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Shen L, An Y, Zhang R, Zhang P, Wu Z, Yan H, Liu J. Enhanced room-temperature ferromagnetism on (In0.98−xCoxSn0.02)2O3 films: magnetic mechanism, optical and transport properties. Phys Chem Chem Phys 2017; 19:29472-29482. [DOI: 10.1039/c7cp05764d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The paper provides new insight for understanding the mechanism of the magnetic interactions in Co/Sn codoped In2O3 films.
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Affiliation(s)
- Luhang Shen
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
| | - Yukai An
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
| | - Rukang Zhang
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
| | - Pan Zhang
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
| | - Zhonghua Wu
- Beijing Synchrotron Radiation Facility (BSRF)
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing 1040049
- China
| | - Hui Yan
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
| | - Jiwen Liu
- Tianjin Key Laboratory for Photoelectric Materials and Devices
- National Demonstration Center for Experimental Function Materials Education
- School of Material Science and Engineering
- Tianjin University of Technology
- Tianjin 300384
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14
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Jampaiah D, Srinivasa Reddy T, Kandjani AE, Selvakannan PR, Sabri YM, Coyle VE, Shukla R, Bhargava SK. Fe-doped CeO2 nanorods for enhanced peroxidase-like activity and their application towards glucose detection. J Mater Chem B 2016; 4:3874-3885. [DOI: 10.1039/c6tb00422a] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Surface defects of Fe-doped CeO2 nanorods were found to be active sites for increasing peroxidase mimetic activity.
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Affiliation(s)
- Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - T. Srinivasa Reddy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - Ahmad Esmaielzadeh Kandjani
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - P. R. Selvakannan
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - Ylias M. Sabri
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - Victoria E. Coyle
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - Ravi Shukla
- Nanobiotechnology Research Laboratory
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
| | - Suresh K. Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC)
- School of Applied Sciences
- RMIT University
- Melbourne-3001
- Australia
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15
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Sarveena S, Vargas JM, Shukla DK, Meneses CT, Mendoza Zélis P, Singh M, Sharma SK. Synthesis, phase composition, Mössbauer and magnetic characterization of iron oxide nanoparticles. Phys Chem Chem Phys 2016; 18:9561-8. [DOI: 10.1039/c5cp07698f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis methods clearly show the effect of argon and vacuum environments on the structure–property relationship of iron oxide nanoparticles. A clear contradiction is observed from the results of static and dynamic magnetization for both samples.
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Affiliation(s)
| | - J. M. Vargas
- Centro Atomico Bariloche (CNEA)
- Instituto Balseiro (U. N. Cuyo) and Conicet
- 8400 San Carlos de Bariloche
- Argentina
| | - D. K. Shukla
- UGC DAE Consortium for Scientific Research
- Indore 452001
- India
| | - C. T. Meneses
- Núcleo de Pós-Graduação em Física, Campus Prof. José Aluísio de Campos
- UFS
- 49100-000 São Cristóvão
- Brazil
| | - P. Mendoza Zélis
- Instituto de Física de La Plata (IFLP-CONICET)
- Universidad Nacional de La Plata (UNLP)
- 1900 La Plata
- Argentina
| | - M. Singh
- Department of Physics
- H. P. University
- Shimla 171005
- India
| | - S. K. Sharma
- Universidade Federal do Maranhão
- Departamento de Física
- São Luis
- Brazil
- Department of Physics
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16
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Sharma A, Varshney M, Park J, Ha TK, Chae KH, Shin HJ. Bifunctional Ce(1-x)Eu(x)O2 (0 ≤x≤ 0.3) nanoparticles for photoluminescence and photocatalyst applications: an X-ray absorption spectroscopy study. Phys Chem Chem Phys 2015; 17:30065-75. [PMID: 26499907 DOI: 10.1039/c5cp05251c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ce1-xEuxO2 (0 ≤x≤ 0.3) nanoparticles (NPs) were synthesized by the chemical precipitation method. The microstructures and morphology were characterized by synchrotron X-ray diffraction and high resolution transmission electron microscopy. X-ray absorption near edge structure (XANES) spectra at the Eu M5,4-edge and atomic-multiplet calculations revealed that Eu(3+) was predominantly present in the CeO2 lattice and Eu(2+) was negligibly present within the entire doping range. The detailed analysis of the Ce M5,4-edge and the O K-edge has shown strong dependence of the Ce(3+)/Ce(4+) ratio and oxygen vacancy with Eu content. Extended X-ray absorption fine structure (EXAFS) spectra at the Ce K-edge, along with theoretical fitting, have shown systematic variation in the coordination number, bond length and Debye-Waller factor with Eu doping. A blue shift in the absorption edge was observed which implies a net increase in the charge transfer gap between the O 2p and Ce 4f bands due to the increased number of Ce(3+) ions in the Eu doped samples. The excitation and emission spectra of pure CeO2 NPs did not show any photoluminescence (PL) characteristic; however, Ce1-xEuxO2 (x = 0.1-0.3) NPs showed significant improvements in the 4f-4f, (5)D0-(7)F2 and (5)D0-(7)F1 transitions induced luminescence properties. Eu doping has two major effects on the electronic structure and optical properties of CeO2 NPs: the first, at an Eu content of 10 mol%, is the formation of Ce(4+)-O-Eu(3+) networks, i.e., Eu(3+) ions substitute the Ce(4+) ions and introduce oxygen vacancies and Ce(3+) ions in the host lattice, which favors the (5)D0-(7)F2 induced PL properties. The other, at an Eu doping over 10 mol%, is the formation of both Ce(4+)-O-Eu(3+) and Ce(3+)-O-Eu(3+), i.e., Eu(3+) ions not only take substitutional sites of Ce(4+) ions but also replace a fraction of Ce(3+) ions in the CeO2 lattice which favors (5)D0-(7)F1 induced PL properties. As an application of CeO2 NPs towards the degradation of water pollutants, we demonstrated that the Ce1-xEuxO2 (0 ≤x≤ 0.3) NPs can serve as effective photocatalyst materials towards the degradation of the methyl-orange aqueous pollutant dye under UV light irradiation.
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Affiliation(s)
- Aditya Sharma
- Pohang Accelerator Laboratory (POSTECH), Pohang-790784, South Korea.
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17
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Cormack AN, Lamphier S, Wang B, Gubb T, Reed K. Simulations of ceria nanoparticles. Proc Math Phys Eng Sci 2015. [DOI: 10.1098/rspa.2015.0218] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Atomistic computer simulations, using classical potential models, have been used to model ceria nanoparticles (NPs) with diameters of approximately 1 and 2 nm. Lattice expansion is observed in the stoichiometric 1 nm NP, consistent with experiment, indicating that reduction is not the primary driver for such expansion. Furthermore, on reduction, the 1 nm NP is found to distort significantly, offering a possible explanation for its reduced oxygen storage capacity compared to the 2 nm NP. Point defect calculations on the 2 nm NP indicate that while doping with La is energetically favourable, Fe incorporation is not.
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Affiliation(s)
- A. N. Cormack
- Inamori School of Engineering, NY State College of Ceramics at Alfred University, Alfred, NY 14802, USA
| | - S. Lamphier
- Inamori School of Engineering, NY State College of Ceramics at Alfred University, Alfred, NY 14802, USA
| | - Bu Wang
- Inamori School of Engineering, NY State College of Ceramics at Alfred University, Alfred, NY 14802, USA
| | - T. Gubb
- Inamori School of Engineering, NY State College of Ceramics at Alfred University, Alfred, NY 14802, USA
| | - K. Reed
- Cerion Enterprises, Inc, Rochester, NY, USA
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Paidi VK, Ferreira NS, Goltz D, van Lierop J. Magnetism mediated by a majority of [Fe³⁺ + VO²⁻] complexes in Fe-doped CeO₂ nanoparticles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:336001. [PMID: 26235592 DOI: 10.1088/0953-8984/27/33/336001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We examine the role of Fe(3+) and vacancies (V(O)) on the magnetism of Fe-doped CeO2 nanoparticles. Magnetic nanoparticles of Ce(100-x)Fe(x)O2 (x = 0, 0.26, 1.82, 2.64, 5.26, 6.91, and 7.22) were prepared by a co-precipitation method, and their structural, compositional and magnetic properties were investigated. The CeO2 nanoparticles had a mixed valance of Ce(4+) and Ce(3+) ions, and doping introduced Fe(3+) ions. The decrease in Ce(3+) and increase in Fe(3+) concentrations indicated the presence of more [Fe(3+) + V(O)(2-)] complexes with Fe loading in the particles. Charge neutralization, Fe(3+) + V(O)(2-) + 2Ce(4+) ↔ 2Ce(3+) + Fe(3+), identified the impact of V(O) on the magnetism, where our results suggest that the Fe-doped CeO2 nanoparticle magnetism is mediated by a majority of [Fe(3+) + V(O)(2-)]-Ce(3+) -[Fe(3+) + V(O)(2-)] complexes.
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Affiliation(s)
- V K Paidi
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
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Kumar RA, Babu KS, Dasgupta A, Ramaseshan R. Enhancing the dual magnetic and optical properties of co-doped cerium oxide nanostructures. RSC Adv 2015. [DOI: 10.1039/c5ra15336k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Iron and europium co-doped cerium oxide nanoparticles exhibits interesting optical and magnetic properties.
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Affiliation(s)
- R. Avinash Kumar
- Centre for Nano Science and Technology
- Madanjeet School of Green Energy Technologies
- Pondicherry University
- Puducherry-605014
- India
| | - K. Suresh Babu
- Centre for Nano Science and Technology
- Madanjeet School of Green Energy Technologies
- Pondicherry University
- Puducherry-605014
- India
| | - Arup Dasgupta
- Microscopy and Thermophysical Property Division
- Physical Metallurgy Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam – 603102
- India
| | - R. Ramaseshan
- Thin Film and Coating Section
- Materials Science Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam – 603102
- India
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20
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Peng DZ, Chen SY, Chen CL, Gloter A, Huang FT, Dong CL, Chan TS, Chen JM, Lee JF, Lin HJ, Chen CT, Chen YY. Understanding and tuning electronic structure in modified ceria nanocrystals by defect engineering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10430-10439. [PMID: 25105822 DOI: 10.1021/la501576c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This study investigates the effect of Fe(3+) on the electronic structure of nanocrystalline ceria. Systematic synchrotron X-ray absorption spectroscopy coupled with scanning transmission electron microscopy/electron energy loss spectroscopy was utilized. The oxygen vacancies can be engineered and their number varied with the degree of iron doping. Comparing the local electronic structure around Ce sites with that around Fe sites reveals two stages of defect engineering. The concentration of Ce(3+) and the distribution of defects differ between lower and higher degrees of doping. Charge is transferred between Ce and Fe when the doping level is less than 5%, but this effect is not significant at a doping level of over 5%. This transfer of charge is verified by energy loss spectroscopy. These Fe-modified ceria nanoparticles exhibit core-shell-like structures at low doping levels and this finding is consistent with the results of scanning transmission electron microscopy/electron energy loss spectroscopy. More Fe is distributed at the surface for doping levels less than 5%, whereas the homogeneity of Fe in the system increases for doping levels higher than 5%. X-ray magnetic circular dichroism spectroscopy reveals that Ce, rather than Fe, is responsible for the ferromagnetism. Interestingly, Ce(3+) is not essential for producing the ferromagnetism. The oxygen vacancies and the defect structure are suggested to be the main causes of the ferromagnetism. The charge transfer and defect structure Fe(3+)-Vo-Ce(3+) and Fe(3+)-Vo-Fe(3+) are critical for the magnetism, and the change in saturated magnetization can be understood as being caused by the competition between interactions that originate from magnetic polarons and from paired ions.
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Affiliation(s)
- Dong-Ze Peng
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
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Sharma A, Varshney M, Shin HJ, Park YJ, Kim MG, Ha TK, Chae KH, Gautam S. Electronic structure study of Ce1−xAxO2 (A = Zr & Hf) nanoparticles: NEXAFS and EXAFS investigations. Phys Chem Chem Phys 2014; 16:19909-16. [DOI: 10.1039/c4cp02409e] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
4f-occupation, Ce+3/Ce+4 ratio and grain-size effects in Zr- and Hf-substituted CeO2 nanoparticles are investigated by NEAXFS and EXAFS.
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Affiliation(s)
- Aditya Sharma
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Mayora Varshney
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Hyun-Joon Shin
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Yong Jun Park
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Min-Gyu Kim
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Tae-Kyun Ha
- Pohang Accelerator Laboratory
- POSTECH
- Pohang – 790-784, South Korea
| | - Keun Hwa Chae
- Advanced Analysis centre
- Korea Institute of Science and Technology
- Seoul – 136-791, South Korea
| | - Sanjeev Gautam
- Advanced Analysis centre
- Korea Institute of Science and Technology
- Seoul – 136-791, South Korea
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