1
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Xiong P, Xu Z, Wu TS, Yang T, Lei Q, Li J, Li G, Yang M, Soo YL, Bennett RD, Lau SP, Tsang SCE, Zhu Y, Li MMJ. Synthesis of core@shell catalysts guided by Tammann temperature. Nat Commun 2024; 15:420. [PMID: 38200021 PMCID: PMC10782006 DOI: 10.1038/s41467-024-44705-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 01/02/2024] [Indexed: 01/12/2024] Open
Abstract
Designing high-performance thermal catalysts with stable catalytic sites is an important challenge. Conventional wisdom holds that strong metal-support interactions can benefit the catalyst performance, but there is a knowledge gap in generalizing this effect across different metals. Here, we have successfully developed a generalizable strong metal-support interaction strategy guided by Tammann temperatures of materials, enabling functional oxide encapsulation of transition metal nanocatalysts. As an illustrative example, Co@BaAl2O4 core@shell is synthesized and tracked in real-time through in-situ microscopy and spectroscopy, revealing an unconventional strong metal-support interaction encapsulation mechanism. Notably, Co@BaAl2O4 exhibits exceptional activity relative to previously reported core@shell catalysts, displaying excellent long-term stability during high-temperature chemical reactions and overcoming the durability and reusability limitations of conventional supported catalysts. This pioneering design and widely applicable approach has been validated to guide the encapsulation of various transition metal nanoparticles for environmental tolerance functionalities, offering great potential to advance energy, catalysis, and environmental fields.
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Affiliation(s)
- Pei Xiong
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Zhihang Xu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Tong Yang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Qiong Lei
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Jiangtong Li
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Guangchao Li
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Ming Yang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | | | - Shu Ping Lau
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
| | - Shik Chi Edman Tsang
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK.
| | - Ye Zhu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.
| | - Molly Meng-Jung Li
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.
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2
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Hu Y, Xu Z, Guo X, Xiong P, Xu C, Chen C, Zhang Q, Wang S, Wu TS, Soo YL, Li MMJ, Wang D, Zhu Y. Hollow-Carbon Confinement Annealing: A New Synthetic Approach to Make High-Entropy Solid-Solution and Intermetallic Nanoparticles. Nano Lett 2023. [PMID: 37963268 DOI: 10.1021/acs.nanolett.3c02882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
High-entropy alloy (HEA) nanoparticles (NPs) have been emerging with superior compositional tunability and multielemental synergy, presenting a unique platform for material discovery and performance optimization. Here we report a synthetic approach utilizing hollow-carbon confinement in the ordinary furnace annealing to achieve the nonequilibrium HEA-NPs such as Pt0.45Fe0.18Co0.12Ni0.15Mn0.10 with uniform size ∼5.9 nm. The facile temperature control allows us not only to reveal the detailed reaction pathway through ex situ characterization but also to tailor the HEA-NP structure from the crystalline solid solution to intermetallic. The preconfinement of metal precursors is the key to ensure the uniform distribution of metal nanoparticles with confined volume, which is essential to prevent the thermodynamically favored phase separation even during the ordinary furnace annealing. Besides, the synthesized HEA-NPs exhibit remarkable activity and stability in oxygen reduction catalysis. The demonstrated synthetic approach may significantly expand the scope of HEA-NPs with uncharted composition and performance.
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Affiliation(s)
- Yezhou Hu
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Zhihang Xu
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Xuyun Guo
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Pei Xiong
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Chao Xu
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Changsheng Chen
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Qian Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Shuang Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Molly Meng-Jung Li
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
| | - Deli Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Ye Zhu
- Department of Applied Physics, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, P. R. China
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3
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Chen SF, Wu TS, Soo YL. Highly defective graphene quantum dots-doped 1T/2H-MoS 2 as an efficient composite catalyst for the hydrogen evolution reaction. Sci Rep 2023; 13:15184. [PMID: 37704697 PMCID: PMC10499812 DOI: 10.1038/s41598-023-42410-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 09/10/2023] [Indexed: 09/15/2023] Open
Abstract
We present a new composite catalyst system of highly defective graphene quantum dots (HDGQDs)-doped 1T/2H-MoS2 for efficient hydrogen evolution reactions (HER). The high electrocatalytic activity, represented by an overpotential of 136.9 mV and a Tafel slope of 57.1 mV/decade, is due to improved conductivity, a larger number of active sites in 1T-MoS2 compared to that in 2H-MoS2, and additional defects introduced by HDGQDs. High-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) were used to characterize both the 1T/2H-MoS2 and GQDs components while Fourier-transform infrared spectroscopy (FTIR) was employed to identify the functional groups on the edge and defect sites in the HDGQDs. The morphology of the composite catalyst was also examined by field emission scanning electron microscopy (FESEM). All experimental data demonstrated that each component contributes unique advantages that synergistically lead to the significantly improved electrocatalytic activity for HER in the composite catalyst system.
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Affiliation(s)
- Sheng-Fu Chen
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan.
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan.
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4
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Ng BY, Zhou ZJ, Liu TT, Yoskamtorn T, Li G, Wu TS, Soo YL, Wu XP, Tsang SCE. Photo-Induced Active Lewis Acid-Base Pairs in a Metal-Organic Framework for H 2 Activation. J Am Chem Soc 2023; 145:19312-19320. [PMID: 37611205 PMCID: PMC10485891 DOI: 10.1021/jacs.3c05244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Indexed: 08/25/2023]
Abstract
The establishment of active sites as the frustrated Lewis pair (FLP) has recently attracted much attention ranging from homogeneous to heterogeneous systems in the field of catalysis. Their unquenched reactivity of Lewis acid and base pairs in close proximity that are unable to form stable adducts has been shown to activate small molecules such as dihydrogen heterolytically. Herein, we show that grafted Ru metal-organic framework-based catalysts prepared via N-containing linkers are rather catalytically inactive for H2 activation despite the application of elevated temperatures. However, upon light illumination, charge polarization of the anchored Ru bipyridine complex can form a transient Lewis acid-base pair, Ru+-N- via metal-to-ligand charge transfer, as confirmed by time-dependent density functional theory (TDDFT) calculations to carry out effective H2-D2 exchange. FTIR and 2-D NMR endorse the formation of such reactive intermediate(s) upon light irradiation.
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Affiliation(s)
- Bryan
Kit Yue Ng
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
| | - Zi-Jian Zhou
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Ting-Ting Liu
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | | | - Guangchao Li
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
| | - Tai-Sing Wu
- National
Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
| | - Yun-Liang Soo
- Department
of Physics, National Tsing Hua University, Hsin-chu 30013, Taiwan
| | - Xin-Ping Wu
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
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5
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Jiang Y, Sung Y, Choi C, Bang GJ, Hong S, Tan X, Wu TS, Soo YL, Xiong P, LI MMJ, Hao L, Jung Y, Sun Z. Single‐Atom Molybdenum–N3 Sites for Selective Hydrogenation of CO2 to CO. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yiqiang Jiang
- Beijing University of Chemical Technology College of Chemical Engineering Department of Materials and Chemical Engineering CHINA
| | - Yunjin Sung
- Korea Advanced Institute of Science and Technology Department of Chemical and Biomolecular Engineering KOREA, REPUBLIC OF
| | - Changhyeok Choi
- Korea Advanced Institute of Science and Technology Department of Chemical and Biomolecular Engineering KOREA, REPUBLIC OF
| | - Gi Joo Bang
- Korea Advanced Institute of Science and Technology Department of Chemical and Biomolecular Engineering KOREA, REPUBLIC OF
| | - Song Hong
- Beijing University of Chemical Technology College of Chemical Engineering Department of Materials and Chemical Engineering Beijing Third Ring Road, Chaoyang District, Beijing 100029 Beijing CHINA
| | - Xinyi Tan
- Beijing Institute of Technology School of Chemical Engineering and the Environment CHINA
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center Department of Physics TAIWAN
| | - Yun-Liang Soo
- National Tsing Hua University Department of Physics TAIWAN
| | - Pei Xiong
- The Hong Kong Polytechnic University Department of Applied Physics CHINA
| | - Molly Meng-Jung LI
- The Hong Kong Polytechnic University Department of Applied Physics CHINA
| | - Leiduan Hao
- Beijing University of Chemical Technology College of Chemical Engineering Department of Materials and Chemical Engineering CHINA
| | - Yousung Jung
- Korea Advanced Institute of Science and Technology Department of Chemical and Biomolecular Engineering KOREA, REPUBLIC OF
| | - Zhenyu Sun
- Beijing University of Chemical Technology Department of Chemical Engineering North Third Ring Road 15, Chaoyang District, Beijing, China 100029 Beijing CHINA
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6
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Chang YS, Chou SH, Jhang YJ, Wu TS, Lin LX, Soo YL, Hsiao IL. Extraction method development for nanoplastics from oyster and fish tissues. Sci Total Environ 2022; 814:152675. [PMID: 34968609 DOI: 10.1016/j.scitotenv.2021.152675] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/01/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
Nanoplastics are now found in some environmental media and consumer products. However, very limited data on nanoplastics are available for one of the main human consumption sources of microplastics: seafood. Unlike microplastics, a method for extracting nanoplastics from seafood is still lacking. Herein, a combination of common extraction techniques including enzymatic digestion, sequential membrane filtration, centrifugal concentration, and purification (dialysis and sodium dodecylsulfate (SDS) incubation), was developed to extract nanoplastics from oyster and fish tissues. Corolase with subsequent lipase treatment achieved the highest digestion efficiencies (88- 89%) for non-homogenized tissues compared to other proteases and additional cellulase or H2O2 treatment. With the exception of polyethylene terephthalate (PET), enzymatic digestion did not change the morphology or structure of polyvinyl chloride (PVC), polyethylene (PE), or polystyrene (PS) nanoplastic particles, and the subsequent extraction procedures had good recoveries of 71- 110% for fluorescence-labeled 76-nm PVC and 100- and 750-nm PS, as validated by a Nanoparticle Tracking Analysis (NTA). Few of the 1011 digested residual particles of 150- 300 nm in diameter per oyster or per serving of fish tissue were left in the method blank. Consequently, this efficient approach could be used as a pretreatment protocol for current potential nanoplastic detection methods.
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Affiliation(s)
- Yu-Shan Chang
- Master Program in Food Safety, College of Nutrition, Taipei Medical University, Taipei 10031, Taiwan
| | - Shih-Hsuan Chou
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ya-Jhu Jhang
- Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center (NSRRC), Hsinchu 30013, Taiwan
| | - Li-Xin Lin
- School of Food Safety, College of Nutrition, Taipei Medical University, Taipei 11031, Taiwan
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University 30013, Taiwan
| | - I-Lun Hsiao
- Master Program in Food Safety, College of Nutrition, Taipei Medical University, Taipei 10031, Taiwan; School of Food Safety, College of Nutrition, Taipei Medical University, Taipei 11031, Taiwan.
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7
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Xue Q, Ng BKY, Man HW, Wu TS, Soo YL, Li MM, Kawaguchi S, Wong KY, Tsang SCE, Huang B, Lo TWB. Controlled synthesis of Bi- and tri-nuclear Cu-oxo nanoclusters on metal-organic frameworks and the structure-reactivity correlations. Chem Sci 2021; 13:50-58. [PMID: 35059150 PMCID: PMC8694280 DOI: 10.1039/d1sc05495c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 11/28/2021] [Indexed: 12/16/2022] Open
Abstract
Precisely tuning the nuclearity of supported metal nanoclusters is pivotal for designing more superior catalytic systems, but it remains practically challenging. By utilising the chemical and molecular specificity of UiO-66-NH2 (a Zr-based metal-organic framework), we report the controlled synthesis of supported bi- and trinuclear Cu-oxo nanoclusters on the Zr6O4 nodal centres of UiO-66-NH2. We revealed the interplay between the surface structures of the active sites, adsorption configurations, catalytic reactivities and associated reaction energetics of structurally related Cu-based 'single atoms' and bi- and trinuclear species over our model photocatalytic formic acid reforming reaction. This work will offer practical insight that fills the critical knowledge gap in the design and engineering of new-generation atomic and nanocluster catalysts. The precise control of the structure and surface sensitivities is important as it can effectively lead to more reactive and selective catalytic systems. The supported bi- and trinuclear Cu-oxo nanoclusters exhibit notably different catalytic properties compared with the mononuclear 'Cu1' analogue, which provides critical insight for the engineering of more superior catalytic systems.
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Affiliation(s)
- Qi Xue
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University Hong Kong China
- The Hong Kong Polytechnic University Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen China
| | - Bryan Kit Yue Ng
- Department of Chemistry, Wolfson Catalysis Centre, University of Oxford Oxford OX1 3QR UK
| | - Ho Wing Man
- The Hong Kong Polytechnic University Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen China
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu 30076 Taiwan
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University Hsinchu 30013 Taiwan
| | - Molly Mengjung Li
- Department of Applied Physics, The Hong Kong Polytechnic University Kowloon Hong Kong China
| | - Shogo Kawaguchi
- Japan Synchrotron Radiation Research Institute (JASRI), SPring-8 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo 679-5198 Japan
| | - Kwok Yin Wong
- The Hong Kong Polytechnic University Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen China
| | - Shik Chi Edman Tsang
- Department of Chemistry, Wolfson Catalysis Centre, University of Oxford Oxford OX1 3QR UK
| | - Bolong Huang
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University Hong Kong China
- The Hong Kong Polytechnic University Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen China
| | - Tsz Woon Benedict Lo
- Department of Applied Biology and Chemical Technology, State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University Hong Kong China
- The Hong Kong Polytechnic University Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen China
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8
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Zheng J, Lebedev K, Wu S, Huang C, Ayvalı T, Wu TS, Li Y, Ho PL, Soo YL, Kirkland A, Tsang SCE. Correction to "High Loading of Transition Metal Single Atoms on Chalcogenide Catalysts". J Am Chem Soc 2021; 143:10014. [PMID: 34159789 DOI: 10.1021/jacs.1c05745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Wu S, Tseng KY, Kato R, Wu TS, Large A, Peng YK, Xiang W, Fang H, Mo J, Wilkinson I, Soo YL, Held G, Suenaga K, Li T, Chen HYT, Tsang SCE. Rapid Interchangeable Hydrogen, Hydride, and Proton Species at the Interface of Transition Metal Atom on Oxide Surface. J Am Chem Soc 2021; 143:9105-9112. [PMID: 34047552 DOI: 10.1021/jacs.1c02859] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydrogen spillover is the phenomenon where a hydrogen atom, generated from the dissociative chemisorption of dihydrogen on the surface of a metal species, migrates from the metal to the catalytic support. This phenomenon is regarded as a promising avenue for hydrogen storage, yet the atomic mechanism for how the hydrogen atom can be transferred to the support has remained controversial for decades. As a result, the development of catalytic support for such a purpose is only limited to typical reducible oxide materials. Herein, by using a combination of in situ spectroscopic and imaging technique, we are able to visualize and observe the atomic pathway for which hydrogen travels via a frustrated Lewis pair that has been constructed on a nonreducible metal oxide. The interchangeable status between the hydrogen, proton, and hydride is carefully characterized and demonstrated. It is envisaged that this study has opened up new design criteria for hydrogen storage material.
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Affiliation(s)
- Simson Wu
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Kai-Yu Tseng
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Ryuichi Kato
- National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.,Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Alexander Large
- Whiteknights, University of Reading, Reading, Berkshire RG6 6AH, United Kingdom
| | | | - Weikai Xiang
- Institute for Materials, Ruhr-Universität Bochum, 44803 Bochum, Germany
| | - Huihuang Fang
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Jiaying Mo
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Ian Wilkinson
- Siemens plc, CT NTF, Wharf Road, Oxford OX29 4BP, United Kingdom
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.,Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Georg Held
- Whiteknights, University of Reading, Reading, Berkshire RG6 6AH, United Kingdom
| | - Kazu Suenaga
- National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Tong Li
- Institute for Materials, Ruhr-Universität Bochum, 44803 Bochum, Germany
| | - Hsin-Yi Tiffany Chen
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Shik Chi Edman Tsang
- The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
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10
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Zheng J, Lebedev K, Wu S, Huang C, Ayvalı T, Wu TS, Li Y, Ho PL, Soo YL, Kirkland A, Tsang SCE. High Loading of Transition Metal Single Atoms on Chalcogenide Catalysts. J Am Chem Soc 2021; 143:7979-7990. [PMID: 34019424 DOI: 10.1021/jacs.1c01097] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Transition metal doped chalcogenides are one of the most important classes of catalysts that have been attracting increasing attention for petrochemical and energy related chemical transformations due to their unique physiochemical properties. For practical applications, achieving maximum atom utilization by homogeneous dispersion of metals on the surface of chalcogenides is essential. Herein, we report a detailed study of a deposition method using thiourea coordinated transition metal complexes. This method allows the preparation of a library of a wide range of single atoms including both noble and non-noble transition metals (Fe, Co, Ni, Cu, Pt, Pd, Ru) with a metal loading as high as 10 wt % on various ultrathin 2D chalcogenides (MoS2, MoSe2, WS2 and WSe2). As demonstrated by the state-of-the-art characterization, the doped single transition metal atoms interact strongly with surface anions and anion vacancies in the exfoliated 2D materials, leading to high metal dispersion in the absence of agglomeration. Taking Fe on MoS2 as a benchmark, it has been found that Fe is atomically dispersed until 10 wt %, and beyond this loading, formation of coplanar Fe clusters is evident. Atomic Fe, with a high electron density at its conduction band, exhibits a superior intrinsic activity and stability in CO2 hydrogenation to CO per Fe compared to corresponding surface Fe clusters and other Fe catalysts reported for reverse water-gas-shift reactions.
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Affiliation(s)
- Jianwei Zheng
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Konstantin Lebedev
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Simson Wu
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Chen Huang
- Department of Materials, University of Oxford, Oxford OX1 PH, U.K
| | - Tuğçe Ayvalı
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Tai-Sing Wu
- Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Yiyang Li
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Ping-Luen Ho
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Angus Kirkland
- Department of Materials, University of Oxford, Oxford OX1 PH, U.K
| | - Shik Chi Edman Tsang
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
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11
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Wu TS, Syu LY, Lin BH, Weng SC, Jeng HT, Huang YS, Soo YL. Reduction of dopant ions and enhancement of magnetic properties by UV irradiation in Ce-doped TiO 2. Sci Rep 2021; 11:7668. [PMID: 33828150 PMCID: PMC8027894 DOI: 10.1038/s41598-021-87115-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 03/22/2021] [Indexed: 11/09/2022] Open
Abstract
We report the experimental observation of and theoretical explanation for the reduction of dopant ions and enhancement of magnetic properties in Ce-doped TiO2 diluted magnetic semiconductors from UV-light irradiation. Substantial increase in Ce3+ concentration and creation of oxygen vacancy defects in the sample due to UV-light irradiation was observed by X-ray and optical methods. Magnetic measurements demonstrate a combination of paramagnetism and ferromagnetism up to room temperatures in all samples. The magnetization of both paramagnetic and ferromagnetic components was observed to be dramatically enhanced in the irradiated sample. First-principle theoretical calculations show that valence holes created by UV irradiation can substantially lower the formation energy of oxygen vacancies. While the electron spin densities for defect states near oxygen vacancies in pure TiO2 are in antiferromagnetic orientation, they are in ferromagnetic orientations in Ce-doped TiO2. Therefore, the ferromagnetically-oriented spin densities near oxygen vacancies created by UV irradiation are the most probable cause for the experimentally observed enhancement of magnetism in the irradiated Ce-doped TiO2.
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Affiliation(s)
- Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Leng-You Syu
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Bi-Hsuan Lin
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Shih-Chang Weng
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Horng-Tay Jeng
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,Institute of Physics, Academia Sinica, Taipei, Taiwan
| | - Yu-Shan Huang
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan. .,Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.
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12
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Xue Q, Xie Y, Wu S, Wu TS, Soo YL, Day S, Tang CC, Man HW, Yuen ST, Wong KY, Wang Y, Lo BTW, Tsang SCE. A rational study on the geometric and electronic properties of single-atom catalysts for enhanced catalytic performance. Nanoscale 2020; 12:23206-23212. [PMID: 33201980 DOI: 10.1039/d0nr06006b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the geometric and electronic properties of single-atom catalysts (SACs) within metal-organic frameworks (MOFs) with respect to electrocatalytic CO2 reduction as a model reaction. A series of mid-to-late 3d transition metals have been immobilised within the microporous cavity of UiO-66-NH2. By employing Rietveld refinement of new-generation synchrotron diffraction, we not only identified the crystallographic and atomic parameters of the SACs that are stabilised with a robust MN(MOF) bonding of ca. 2.0 Å, but also elucidated the end-on coordination geometry with CO2. A volcano trend in the FEs of CO has been observed. In particular, the confinement effect within the rigid MOF can greatly facilitate redox hopping between the Cu SACs, rendering high FEs of CH4 and C2H4 at a current density of -100 mA cm-2. Although only demonstrated in selected SACs within UiO-66-NH2, this study sheds light on the rational engineering of molecular interactions(s) with SACs for the sustainable provision of fine chemicals.
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Affiliation(s)
- Qi Xue
- The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China.
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13
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Li MMJ, Zou H, Zheng J, Wu TS, Chan TS, Soo YL, Wu XP, Gong XQ, Chen T, Roy K, Held G, Tsang SCE. Methanol Synthesis at a Wide Range of H 2 /CO 2 Ratios over a Rh-In Bimetallic Catalyst. Angew Chem Int Ed Engl 2020; 59:16039-16046. [PMID: 32458500 DOI: 10.1002/anie.202000841] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Indexed: 01/06/2023]
Abstract
There is increasing interest in capturing H2 generated from renewables with CO2 to produce methanol. However, renewable hydrogen production is expensive and in limited quantity compared to CO2 . Excess CO2 and limited H2 in the feedstock gas is not favorable for CO2 hydrogenation to methanol, causing low activity and poor methanol selectivity. Now, a class of Rh-In catalysts with optimal adsorption properties to the intermediates of methanol production is presented. The Rh-In catalyst can effectively catalyze methanol synthesis but inhibit the reverse water-gas shift reaction under H2 -deficient gas flow and shows the best competitive methanol productivity under industrially applicable conditions in comparison with reported values. This work demonstrates a strong potential of Rh-In bimetallic composition, from which a convenient methanol synthesis based on flexible feedstock compositions (such as H2 /CO2 from biomass derivatives) with lower energy cost can be established.
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Affiliation(s)
- Molly Meng-Jung Li
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK.,Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong, Hong Kong
| | - Hanbo Zou
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK.,Department of Chemistry and Chemical Engineering, Guangzhou University, China
| | - Jianwei Zheng
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan.,Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan.,Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Xin-Ping Wu
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Xue-Qing Gong
- Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Tianyi Chen
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK
| | - Kanak Roy
- Diamond Light Source, Harwell Campus, Chilton, Oxfordshire, OX11 0DE, UK
| | - Georg Held
- Diamond Light Source, Harwell Campus, Chilton, Oxfordshire, OX11 0DE, UK
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14
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Soo YL, Wu TS, Jeng HT, Chang SL. Effects of X-ray irradiation and thermal annealing on the Co dopant location in Co-doped TiO 2 nanocrystals. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319088478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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15
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Lau THM, Wu S, Kato R, Wu TS, Kulhavý J, Mo J, Zheng J, Foord JS, Soo YL, Suenaga K, Darby MT, Tsang SCE. Engineering Monolayer 1T-MoS2 into a Bifunctional Electrocatalyst via Sonochemical Doping of Isolated Transition Metal Atoms. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01503] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas H. M. Lau
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - Simson Wu
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - Ryuichi Kato
- National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tai-Sing Wu
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Jiří Kulhavý
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - Jiaying Mo
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - Jianwei Zheng
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - John S. Foord
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Kazu Suenaga
- National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Matthew T. Darby
- Thomas Young Centre and Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom
| | - S. C. Edman Tsang
- Department of Chemistry, University of Oxford, Oxford, OX1 3QR, United Kingdom
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16
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Zeleke TS, Tsai MC, Weret MA, Huang CJ, Birhanu MK, Liu TC, Huang CP, Soo YL, Yang YW, Su WN, Hwang BJ. Immobilized Single Molecular Molybdenum Disulfide on Carbonized Polyacrylonitrile for Hydrogen Evolution Reaction. ACS Nano 2019; 13:6720-6729. [PMID: 31082197 DOI: 10.1021/acsnano.9b01266] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Designing a MoS2 catalyst having a large number of active sites and high site activity enables the catalytic activity toward the hydrogen evolution reaction to be improved. Herein, we report the synthesis of a low-cost and catalytically active immobilized single molecular molybdenum disulfide on carbonized polyacrylonitrile (MoS2-cPAN) electrocatalyst. From the extended X-ray absorption fine structure spectra analysis, we found that the as-prepared material has no metal-metal scattering and it resembles MoS2 with a molecular state. Meanwhile, the size of the molecular MoS2 has been estimated to be about 1.31 nm by high-angle annular dark-field scanning transmission electron microscopy. A low coordination number and maximum utilization of the single molecular MoS2 surface enable MoS2-cPAN to demonstrate electrochemical performance significantly better than that of bulk MoS2 by two orders of exchange current density ( jo) and turnover frequency to the hydrogen evolution.
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Affiliation(s)
- Tamene Simachew Zeleke
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Meng-Che Tsai
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Misganaw Adigo Weret
- Department of Materials Science and Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Chen-Jui Huang
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Mulatu Kassie Birhanu
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Tzu-Ching Liu
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Chiu-Ping Huang
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
- Material and Chemical Research Laboratories , Industrial Technology Research Institute , Hsin-Chu 31040 , Taiwan
| | - Yun-Liang Soo
- Department of Physics , National Tsing Hua University , Hsin-Chu 300 , Taiwan
| | - Yaw-Wen Yang
- National Synchrotron Radiation Research Center , Hsin-Chu 30076 , Taiwan
| | - Wei-Nien Su
- NanoElectrochemistry Laboratory, Graduate Institute of Applied Science and Technology , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
| | - Bing-Joe Hwang
- NanoElectrochemistry Laboratory, Department of Chemical Engineering , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
- National Synchrotron Radiation Research Center , Hsin-Chu 30076 , Taiwan
- Applied Research Center for Thin-Film Metallic Glass , National Taiwan University of Science and Technology , Taipei 10607 , Taiwan
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17
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Fisher TJ, Zhou Y, Wu TS, Wang M, Soo YL, Cheung CL. Structure-activity relationship of nanostructured ceria for the catalytic generation of hydroxyl radicals. Nanoscale 2019; 11:4552-4561. [PMID: 30806412 DOI: 10.1039/c8nr09393h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Reactive oxygen species (ROS) are powerful oxidants generated in both biological systems and natural environments. Though enzyme-mimic activity and Fenton-like reactions have been postulated to explain how ceria nanoparticles and ROS are involved in the catalytic decomposition of hydrogen peroxide (H2O2), the corresponding reaction kinetics for this reaction have not yet been completely resolved. Here we present our investigation of the structure-activity relationship of ceria nanostructures for the generation of hydroxyl radicals through the catalytic decomposition of H2O2. Different nanostructured ceria including nanorods (NR), nanocubes (NC), and nanooctahedra (NO), together with commercial ceria, were examined to elucidate the relationship between the morphology and reaction kinetics. The initial relative production rates of hydroxyl radicals over different ceria nanostructures were determined using fluorescence measurements and were applied to obtain the apparent activation energy for their intrinsic activity comparisons. The activity trend of the order: ceria NR > ceria NC > ceria NO > commercial ceria was observed. This trend was rationalized and assessed using activity descriptive factors including the intensity ratio of Raman bands of vibration modes due to atomic defects, the percentage of surface Ce3+ content, and the average coordination number of oxygen anions surrounding each cerium cation in the ceria samples.
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Affiliation(s)
- Tamra J Fisher
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
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18
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Abstract
We report the facile synthesis of Sb single atoms for efficient electrocatalytic CO2 reduction to CO.
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Affiliation(s)
- Mingwen Jia
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Song Hong
- Beijing Key Laboratory of Energy Environmental Catalysis
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Tai-Sing Wu
- Department of Physics
- National Tsing Hua University
- Hsinchu
- Taiwan
| | - Xin Li
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Yun-Liang Soo
- Department of Physics
- National Tsing Hua University
- Hsinchu
- Taiwan
| | - Zhenyu Sun
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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19
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Wang X, Liu M, Shen X, Liu Z, Hu Z, Chen K, Ohresser P, Nataf L, Baudelet F, Lin HJ, Chen CT, Soo YL, Yang YF, Jin C, Long Y. High-Temperature Ferrimagnetic Half Metallicity with Wide Spin-up Energy Gap in NaCu3Fe2Os2O12. Inorg Chem 2018; 58:320-326. [DOI: 10.1021/acs.inorgchem.8b02404] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiao Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Min Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xudong Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhehong Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Kai Chen
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, Cedex, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, Cedex, France
| | - Lucie Nataf
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, Cedex, France
| | - François Baudelet
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, Cedex, France
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ROC
| | - Yi-feng Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Changqing Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Youwen Long
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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20
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Jia M, Choi C, Wu TS, Ma C, Kang P, Tao H, Fan Q, Hong S, Liu S, Soo YL, Jung Y, Qiu J, Sun Z. Carbon-supported Ni nanoparticles for efficient CO 2 electroreduction. Chem Sci 2018; 9:8775-8780. [PMID: 30746113 PMCID: PMC6335639 DOI: 10.1039/c8sc03732a] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 11/04/2018] [Indexed: 12/24/2022] Open
Abstract
The development of highly selective, low cost, and energy-efficient electrocatalysts is crucial for CO2 electrocatalysis to mitigate energy shortages and to lower the global carbon footprint. Herein, we first report that carbon-coated Ni nanoparticles supported on N-doped carbon enable efficient electroreduction of CO2 to CO. In contrast to most previously reported Ni metal catalysts that resulted in severe hydrogen evolution during CO2 conversion, the Ni particle catalyst here presents an unprecedented CO faradaic efficiency of approximately 94% at an overpotential of 0.59 V, even comparable to that of the best single Ni sites. The catalyst also affords a high CO partial current density and a large CO turnover frequency, reaching 22.7 mA cm-2 and 697 h-1 at -1.1 V (versus the reversible hydrogen electrode), respectively. Experiments combined with density functional theory calculations showed that the carbon layer coated on Ni and N-dopants in carbon material both play important roles in improving catalytic activity for electrochemical CO2 reduction to CO by stabilizing *COOH without affecting the easy *CO desorption ability of the catalyst.
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Affiliation(s)
- Mingwen Jia
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Changhyeok Choi
- Graduate School of EEWS , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea .
| | - Tai-Sing Wu
- Department of Physics , National Tsing Hua University , Hsinchu , Taiwan 30013
| | - Chen Ma
- Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Peng Kang
- School of Chemical Engineering and Technology , Tianjin University , Tianjin 300072 , P. R. China
| | - Hengcong Tao
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Qun Fan
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Song Hong
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Shizhen Liu
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Yun-Liang Soo
- Department of Physics , National Tsing Hua University , Hsinchu , Taiwan 30013
| | - Yousung Jung
- Graduate School of EEWS , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , Republic of Korea .
| | - Jieshan Qiu
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
| | - Zhenyu Sun
- State Key Laboratory of Organic-Inorganic Composites , College of Chemical Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China .
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21
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Bhalkikar A, Wu TS, Marin CM, Fisher TJ, Wang M, Wells IH, Sarella A, Soo YL, Cheung CL. Ozone-mediated synthesis of ceria nanoparticles. Nanoscale 2018; 10:9822-9829. [PMID: 29770828 DOI: 10.1039/c8nr01971a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report a rapid, room temperature methodology to synthesize fluorite-structured ceria nanoparticles using cerium(iii) salts and ozone in the presence of short chain primary, secondary, and tertiary alcohols. This simple technique produced nanoparticles with higher oxygen vacancy compared to that of bulk ceria.
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Affiliation(s)
- Anuja Bhalkikar
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
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22
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Lau THM, Lu X, Kulhavý J, Wu S, Lu L, Wu TS, Kato R, Foord JS, Soo YL, Suenaga K, Tsang SCE. Transition metal atom doping of the basal plane of MoS 2 monolayer nanosheets for electrochemical hydrogen evolution. Chem Sci 2018; 9:4769-4776. [PMID: 29910927 PMCID: PMC5975547 DOI: 10.1039/c8sc01114a] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 04/29/2018] [Indexed: 12/23/2022] Open
Abstract
Surface sites of extensively exposed basal planes of MoS2 monolayer nanosheets, prepared via BuLi exfoliation of MoS2, have been doped with transition metal atoms for the first time to produce 2D monolayer catalysts used for the electrochemical hydrogen evolution reaction (HER). Their HER activity is significantly higher than the corresponding thin and bulk MoS2 layers. HAADF-STEM images show direct proof that single transition metal atoms reside at the surface basal sites, which subtly modify the electro-catalytic activity of the monolayer MoS2, dependent on their electronic and stereospecific properties. It is found that these dopants play an important role in tuning the hydrogen adsorption enthalpies of the exposed surface S atoms and Mo atoms in HER. We report electrochemical testing, characterization and computational modelling and demonstrate that Co can significantly enhance the HER activity by the dominant Co-S interaction, whereas Ni substantially lowers the HER rate due to the Ni-Mo interaction at the same basal site. The two transition metal dopants show opposite doping behavior despite the fact that they are neighbors in the periodic table.
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Affiliation(s)
- Thomas H M Lau
- Department of Chemistry , University of Oxford , Oxford , OX1 3QR , UK .
| | - XiaoWei Lu
- Department of Chemistry , University of Oxford , Oxford , OX1 3QR , UK .
| | - Jiří Kulhavý
- Department of Chemistry , University of Oxford , Oxford , OX1 3QR , UK .
| | - Simson Wu
- Department of Chemistry , University of Oxford , Oxford , OX1 3QR , UK .
| | - Lilin Lu
- College of Chemistry and Chemical Engineering , Wuhan University of Science and Technology , China
| | - Tai-Sing Wu
- Department of Physics , National Tsing Hua University , Hsinchu , Taiwan
| | - Ryuichi Kato
- National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi , Tsukuba , Ibaraki 305-8565 , Japan
| | - John S Foord
- Department of Chemistry , University of Oxford , Oxford , OX1 3QR , UK .
| | - Yun-Liang Soo
- Department of Physics , National Tsing Hua University , Hsinchu , Taiwan
| | - Kazu Suenaga
- National Institute of Advanced Industrial Science and Technology (AIST) , Central 5, 1-1-1 Higashi , Tsukuba , Ibaraki 305-8565 , Japan
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23
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Kreissl HT, Li MMJ, Peng YK, Nakagawa K, Hooper TJN, Hanna JV, Shepherd A, Wu TS, Soo YL, Tsang SCE. Structural Studies of Bulk to Nanosize Niobium Oxides with Correlation to Their Acidity. J Am Chem Soc 2017; 139:12670-12680. [DOI: 10.1021/jacs.7b06856] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Hannah T. Kreissl
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Molly M. J. Li
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Yung-Kang Peng
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Keizo Nakagawa
- Centre
for Membrane and Film Technology, Graduate School of Science, Technology
and Innovation, Kobe University, Kobe 657-8501, Japan
| | - Thomas J. N. Hooper
- Department
of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - John V. Hanna
- Department
of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Ashley Shepherd
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S. C. Edman Tsang
- Department
of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
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24
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Wu TS, Chen YW, Weng SC, Lin CN, Lai CH, Huang YJ, Jeng HT, Chang SL, Soo YL. Dramatic band gap reduction incurred by dopant coordination rearrangement in Co-doped nanocrystals of CeO 2. Sci Rep 2017; 7:4715. [PMID: 28680089 PMCID: PMC5498595 DOI: 10.1038/s41598-017-05046-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 05/24/2017] [Indexed: 11/09/2022] Open
Abstract
A dramatic band gap narrowing of 1.61 eV has been observed in Co-doped nanocrystals of CeO2 (ceria), as a result of thermal annealing, without changing the ceria crystal structure and the Co concentration. As demonstrated by x-ray absorption fine structures, thermal annealing incurs an oxygen coordination rearrangement around Co atoms from an octahedral coordination to a square-planar coordination. First principle calculation using density functional theory reveals two stable oxygen coordination types surrounding Co, consistent with the experimental observation. The band gap values calculated for the two stable coordination types differ dramatically, reproducing the experimentally observed band gap narrowing. These prominent effects due to local structure rearrangement around dopant atoms can lead to unprecedented methods for band gap engineering in doped nanocrystal oxides.
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Affiliation(s)
- T S Wu
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Y W Chen
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - S C Weng
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - C N Lin
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - C H Lai
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Y J Huang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - H T Jeng
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,Institute of Physics, Academia Sinica, Taipei, Taiwan
| | - S L Chang
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Y L Soo
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan. .,National Synchrotron Radiation Research Center, Hsinchu, Taiwan.
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25
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Liu WC, Zheng YZ, Chih YC, Lai YC, Tsai YW, Zheng YZ, Du CH, Chou FC, Soo YL, Chang SL. X-ray multi-beam resonant diffraction analysis of crystal symmetry for layered perovskite YBaCuFeO5. J Appl Crystallogr 2016. [DOI: 10.1107/s1600576716013248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The open question of crystal symmetry for YBaCuFeO5, still under debate, is resolved by using diffraction anomalous fine structure and resonant multi-beam X-ray diffraction at the Fe and Cu K edges. The different asymmetric intensity distributions observed at 7, 7.1305 and 8.9945 keV give direct evidence that the space group of YBaCuFeO5 should be P4/mmm with the distance between Cu and apical O atoms longer than that between Fe and O atoms. This approach provides a direct way to resolve detailed structural symmetry which is indeterminate in conventional Bragg diffraction.
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26
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Wu TS, Zhou Y, Sabirianov RF, Mei WN, Soo YL, Cheung CL. X-ray absorption study of ceria nanorods promoting the disproportionation of hydrogen peroxide. Chem Commun (Camb) 2016; 52:5003-6. [PMID: 26981885 DOI: 10.1039/c5cc10643e] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A quasi in situ X-ray absorption study demonstrated that the disproportionation of hydrogen peroxide (H2O2) promoted by ceria nanorods was associated with a reversible Ce(3+)/Ce(4+) reaction and structural transformations in ceria. The direction of this reversible reaction was postulated to depend on the H2O2 concentration and the fraction of Ce(3+) species in ceria nanorods.
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Affiliation(s)
- Tai-Sing Wu
- Department of Physics, National Tsing-Hua University, Hsinchu, 30013, Taiwan. and National Synchrotron Radiation Research Center, Hsinchu, 30013, Taiwan
| | - Yunyun Zhou
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Renat F Sabirianov
- Department of Physics, University of Nebraska-Omaha, Omaha, NE 68182, USA
| | - Wai-Ning Mei
- Department of Physics, University of Nebraska-Omaha, Omaha, NE 68182, USA
| | - Yun-Liang Soo
- Department of Physics, National Tsing-Hua University, Hsinchu, 30013, Taiwan. and National Synchrotron Radiation Research Center, Hsinchu, 30013, Taiwan
| | - Chin Li Cheung
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
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27
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Zheng YZ, Wu TW, Yu LK, Wei YC, Liu WC, Soo YL, Chang SL. Simultaneous determination of tensile and shear strains of crystalline bilayers using three Bragg reflections of X-rays. J Appl Crystallogr 2016. [DOI: 10.1107/s1600576716009572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
A method for the simultaneous determination of nine strain coefficients, both shear and tensile, of crystalline bilayers is proposed and realized. The X-ray diffraction peak intensities along 2θ (vertical) and β (horizontal) scans relative to the plane of incidence of three Bragg reflections whose atomic planes are not parallel to each other can be used to obtain shear and tensile strain coefficients. The theoretical considerations and experimental examples for single-crystal GeSi/Si overlayers are reported. It is also demonstrated that, for GeSi/Si, the shear and tensile strain coefficients of the Si substrate tend to vanish when the GeSi layer is thicker than 40 nm.
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28
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Zheng YZ, Soo YL, Chang SL. Depth profiles of the interfacial strains of Si0.7Ge0.3/Si using three-beam Bragg-surface diffraction. Sci Rep 2016; 6:25580. [PMID: 27156699 PMCID: PMC4860642 DOI: 10.1038/srep25580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 04/18/2016] [Indexed: 11/30/2022] Open
Abstract
Interfacial strains are important factors affecting the structural and physical properties of crystalline multilayers and heterojunctions, and the performance of the devices made of multilayers used, for example, in nanowires, optoelectronic components, and many other applications. Currently existing strain measurement methods, such as grazing incidence X-ray diffraction (GIXD), cross-section transmission electron microscope, TEM, and coherent diffractive imaging, CDI, are limited by either the nanometer spatial resolution, penetration depth, or a destructive nature. Here we report a new non-destructive method of direct mapping the interfacial strain of [001] Si0.7Ge0.3/Si along the depth up to ~287 nm below the interface using three-beam Bragg-surface X-ray diffraction (BSD), where one wide-angle symmetric Bragg reflection and a surface reflection are simultaneously involved. Our method combining with the dynamical diffraction theory simulation can uniquely provide unit cell dimensions layer by layer, and is applicable to thicker samples.
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Affiliation(s)
- Yan-Zong Zheng
- Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu, Taiwan 30013
| | - Yun-Liang Soo
- Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu, Taiwan 30013.,National Synchrotron Radiation Research Center, 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu, Taiwan 30076
| | - Shih-Lin Chang
- Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu, Taiwan 30013.,National Synchrotron Radiation Research Center, 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu, Taiwan 30076
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29
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Xia Q, Zhuang X, Li MMJ, Peng YK, Liu G, Wu TS, Soo YL, Gong XQ, Wang Y, Tsang SCE. Cooperative catalysis for the direct hydrodeoxygenation of vegetable oils into diesel-range alkanes over Pd/NbOPO4. Chem Commun (Camb) 2016; 52:5160-3. [PMID: 26998532 DOI: 10.1039/c5cc10419j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Near quantitative carbon yields of diesel-range alkanes were achieved from the hydrodeoxygenation of triglycerides over Pd/NbOPO4 under mild conditions with no catalyst deactivation: catalyst characterization and theoretical calculations suggest that the high hydrodeoxygenation activity originated from the synergistic effect of Pd and strong Lewis acidity on the unique structure of NbOPO4.
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Affiliation(s)
- Qineng Xia
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK.
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30
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Tseng YT, Chen CH, Lin JY, Li BH, Lu YH, Lin CH, Chen HT, Weng TC, Sokaras D, Chen HY, Soo YL, Lu TT. To Transfer or Not to Transfer? Development of a Dinitrosyl Iron Complex as a Nitroxyl Donor for the Nitroxylation of an Fe(III) -Porphyrin Center. Chemistry 2015; 21:17570-3. [PMID: 26437878 DOI: 10.1002/chem.201503176] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Indexed: 12/16/2022]
Abstract
A positive myocardial inotropic effect achieved using HNO/NO(-) , compared with NO⋅, triggered attempts to explore novel nitroxyl donors for use in clinical applications in vascular and myocardial pharmacology. To develop M-NO complexes for nitroxyl chemistry and biology, modulation of direct nitroxyl-transfer reactivity of dinitrosyl iron complexes (DNICs) is investigated in this study using a Fe(III) -porphyrin complex and proteins as a specific probe. Stable dinuclear {Fe(NO)2 }(9) DNIC [Fe(μ-(Me) Pyr)(NO)2 ]2 was discovered as a potent nitroxyl donor for nitroxylation of Fe(III) -heme centers through an associative mechanism. Beyond the efficient nitroxyl transfer, transformation of DNICs into a chemical biology probe for nitroxyl and for pharmaceutical applications demands further efforts using in vitro/in vivo studies.
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Affiliation(s)
- Yu-Ting Tseng
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Chien-Hong Chen
- School of Medical Applied Chemistry, Chung Shan Medical University, No. 110, Section 1, Jianguo North Rd. Taichung, 40201 (Taiwan)
| | - Jing-Yu Lin
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Bing-Han Li
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Yu-Huan Lu
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Chia-Her Lin
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Hsin-Tsung Chen
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan)
| | - Tsu-Chien Weng
- SLAC National Accelerator Laboratory 2575 Sand Hill Rd. Menlo Park, CA 94025 (USA)
| | - Dimosthenes Sokaras
- SLAC National Accelerator Laboratory 2575 Sand Hill Rd. Menlo Park, CA 94025 (USA)
| | - Huang-Yeh Chen
- National Synchrotron Radiation Research Center No. 101, Xin'an Rd., Hsinchu, 30076 (Taiwan)
| | - Yun-Liang Soo
- National Synchrotron Radiation Research Center No. 101, Xin'an Rd., Hsinchu, 30076 (Taiwan).,Department of Physics, National Tsing Hua University No. 101, Section 2, Guangfu Rd., Hsinchu, 30013 (Taiwan)
| | - Tsai-Te Lu
- Department of Chemistry, Chung Yuan Christian University No. 200, Chung Pei Rd. Taoyuan, 32023 (Taiwan).
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31
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Wu TS, Li HD, Chen YW, Chen SF, Su YS, Chu CH, Pao CW, Lee JF, Lai CH, Jeng HT, Chang SL, Soo YL. Unconventional interplay between heterovalent dopant elements: Switch-and-modulator band-gap engineering in (Y, Co)-Codoped CeO2 nanocrystals. Sci Rep 2015; 5:15415. [PMID: 26486721 PMCID: PMC4613893 DOI: 10.1038/srep15415] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 09/28/2015] [Indexed: 11/13/2022] Open
Abstract
We report the experimental observation and theoretical explanation of an unconventional interplay between divalent Co and trivalent Y dopants, both of which incur oxygen vacancies in the CeO2 host that has predominantly tetravalent Ce cations. The Co dopant atoms were experimentally found to act as a switch that turns on the dormant effect of Y-modulated band-gap reduction. As revealed by density functional theory (DFT) calculations with structures verified by synchrotron-radiation x-ray measurements, a Co 3d band that hybridizes with Ce 4f band was lowered due to reduced O 2p repulsion arising from oxygen vacancies incurred by Y doping and therefore gave rise to the observed band-gap narrowing effect. Such switch-and-modulator scheme for band-gap engineering in nanocrystal materials can lead to important applications in environmental protection and solar energy harvesting technologies.
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Affiliation(s)
- T S Wu
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - H D Li
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Y W Chen
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - S F Chen
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
| | - Y S Su
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - C H Chu
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - C W Pao
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - J F Lee
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - C H Lai
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - H T Jeng
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,Institute of Physics, Academia Sinica, Taipei, Taiwan
| | - S L Chang
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Y L Soo
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.,National Synchrotron Radiation Research Center, Hsinchu, Taiwan
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32
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Zhou Y, Lawrence NJ, Wu TS, Liu J, Kent P, Soo YL, Cheung CL. Pd/CeO2−xNanorod Catalysts for CO Oxidation: Insights into the Origin of Their Regenerative Ability at Room Temperature. ChemCatChem 2014. [DOI: 10.1002/cctc.201402243] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Wu TS, Jeng HT, Chang SL, Soo YL. Effects of Annealing and X-ray Exposure in (Y,Co)-Codoped CeO2 Probed by XAFS. Acta Crystallogr A Found Adv 2014. [DOI: 10.1107/s2053273314082187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Local structures surrounding Co dopoant atoms in (Y,Co) codoped CeO2 nanocrystals prepared by a chemical method followed by a series of thermal annealing and x-ray exposure have been probed using x-ray absorption fine structure (XAFS) techniques. These material systems are of great interest for catalytic applications. Our x-ray results show systematic variation of local structures surrounding Co atoms due to thermal annealing at different temperatures. It was also found that x-ray exposure with sufficient incident photon energy can substantially neutralize the structural effects of annealing. A theoretical model based on calculation using the Vienna ab initio Simulation Package (VASP) was proposed to identify relevant dopant locations that lead to the observed XAFS results and to explain the migration of Co in the CeO2 host due to the x-ray and thermal treatments. Manipulation of dopant atoms using x-ray exposure may provide unprecedented opportunities for tuning the physical properties of these materials for catalytic applications.
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34
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Zhou Y, Lawrence NJ, Wang L, Kong L, Wu TS, Liu J, Gao Y, Brewer JR, Lawrence VK, Sabirianov RF, Soo YL, Zeng XC, Dowben PA, Mei WN, Cheung CL. Resonant Photoemission Observations and DFT Study of s-d Hybridization in Catalytically Active Gold Clusters on Ceria Nanorods. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Zhou Y, Lawrence NJ, Wang L, Kong L, Wu TS, Liu J, Gao Y, Brewer JR, Lawrence VK, Sabirianov RF, Soo YL, Zeng XC, Dowben PA, Mei WN, Cheung CL. Resonant Photoemission Observations and DFT Study of s-d Hybridization in Catalytically Active Gold Clusters on Ceria Nanorods. Angew Chem Int Ed Engl 2013; 52:6936-9. [DOI: 10.1002/anie.201301383] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Indexed: 11/06/2022]
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36
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Weng SC, Lee YR, Chen CG, Chu CH, Soo YL, Chang SL. Direct observation of charge ordering in magnetite using resonant multiwave x-ray diffraction. Phys Rev Lett 2012; 108:146404. [PMID: 22540813 DOI: 10.1103/physrevlett.108.146404] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Indexed: 05/12/2023]
Abstract
Charge disproportion at octahedral Fe sites in magnetite was observed at low temperature using two inversion-symmetry related three-wave resonant x-ray diffraction, 022-311 and 002-̅3̅1, near the iron K edge. Both of the three-wave cases involve the (002) forbidden-weak reflection. The self-normalized three-wave to two-wave (002) diffraction intensity ratio automatically cancels the self-absorption effect and leads to direct determination of charge disproportion for magnetite below 120 K. This approach provides a more direct and effective way for extracting charge-ordering information.
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Affiliation(s)
- Shih-Chang Weng
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, ROC
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37
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Chen TK, Lin YC, Chen YC, Chen YL, Tseng WL, Lee JF, Soo YL, Lee SF, Lin MT, Chang CC. Magnetic and Metal Binding Structural Analysis of Mn,Zn-Metallothionein-Green Fluorescence Fusion Protein. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.1021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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38
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Lawrence NJ, Brewer JR, Wang L, Wu TS, Wells-Kingsbury J, Ihrig MM, Wang G, Soo YL, Mei WN, Cheung CL. Defect engineering in cubic cerium oxide nanostructures for catalytic oxidation. Nano Lett 2011; 11:2666-2671. [PMID: 21627100 DOI: 10.1021/nl200722z] [Citation(s) in RCA: 132] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Traditional nanostructured design of cerium oxide catalysts typically focuses on their shape, size, and elemental composition. We report a different approach to enhance the catalytic activity of cerium oxide nanostructures through engineering high density of oxygen vacancy defects in these catalysts without dopants. The defect engineering was accomplished by a low pressure thermal activation process that exploits the nanosize effect of decreased oxygen storage capacity in nanostructured cerium oxides.
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Affiliation(s)
- Neil J Lawrence
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
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39
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Lou JL, Shiu HW, Chang LY, Wu CP, Soo YL, Chen CH. Preparation and characterization of an ordered 1-dodecanethiol monolayer on bare Si(111) surface. Langmuir 2011; 27:3436-41. [PMID: 21401112 DOI: 10.1021/la103585t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We have grown 1-dodecandthiol (DDT) monolayer on a bare Si(111) surface through ultraviolet-assisted photochemical reaction. The resulting monolayer was investigated by means of water contact angle measurement, synchrotron radiation-based high-resolution X-ray photoelectron spectroscopy, and polarization-dependent near-edge X-ray absorption fine structure spectroscopy. These combined probes for characterization reveal a hydrophobic ambient surface; the DDT was directly attached to Si through a Si-S bond, and the molecules formed an ordered monolayer with an average tilt angle of 57° of the alkyl chains relative to the substrate surface.
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Affiliation(s)
- Jie Ling Lou
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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40
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Lee YR, Stetsko YP, Sun WH, Weng SC, Cheng SY, Lin GG, Soo YL, Chang SL. Multiple wave diffraction anomalous fine structure. Phys Rev Lett 2006; 97:185502. [PMID: 17155552 DOI: 10.1103/physrevlett.97.185502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Indexed: 05/12/2023]
Abstract
A new method, multiple-wave diffraction anomalous fine structure, combining the x-ray multiple-wave diffraction and diffraction anomalous fine structure techniques, is proposed. The real part of dispersion correction Deltaf' and fine structure chi function can be obtained directly by multiple diffraction analysis without using Kramers-Krönig relations and kinematical fitting of diffracted intensity. Better wave vector sensitivity of the fine structure is expected. The multiple-wave diffraction anomalous fine structure experiment for a GaAs single crystal is reported as an example.
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Affiliation(s)
- Yen-Ru Lee
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China 300
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41
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Soo YL, Kioseoglou G, Huang S, Kim S, Kao YH, Takatani Y, Haneda S, Munekata H. Studies of impurities in magnetic semiconductors: an example of important XAFS applications. J Synchrotron Radiat 2001; 8:874-876. [PMID: 11512963 DOI: 10.1107/s0909049500016708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2000] [Accepted: 11/08/2000] [Indexed: 05/23/2023]
Abstract
The x-ray absorption fine structure (XAFS) technique has been employed to investigate the local structure and valency about Mn and Fe ions in the III-V diluted magnetic semiconductors In(1-x)Mn(x)As and Ga(1-x)Fe(x)As, prepared by molecular-beam-epitaxy under various growth conditions. These new systems are promising magnetic materials of considerable current interest and with important technical applications including photo-carrier induced magnetism and spin-polarized current devices. The local structure around the magnetic ions can play a pivotal role in affecting the magnetic properties of these semiconductors. Local structure information obtained from XAFS has provided the first direct evidence that the magnetic impurities can indeed substitute for the cation host atoms in samples prepared under appropriate conditions.
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Affiliation(s)
- Y L Soo
- Department of Physics, State University of New York at Buffalo, Amherst 14260, USA.
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42
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Soo YL, Huang SW, Ming ZH, Kao YH, Munekata H, Chang LL. III-V diluted magnetic semiconductor: Substitutional doping of Mn in InAs. Phys Rev B Condens Matter 1996; 53:4905-4909. [PMID: 9984052 DOI: 10.1103/physrevb.53.4905] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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43
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Soo YL, Ming ZH, Huang SW, Kao YH, Bhargava RN, Gallagher D. Local structures around Mn luminescent centers in Mn-doped nanocrystals of ZnS. Phys Rev B Condens Matter 1994; 50:7602-7607. [PMID: 9974743 DOI: 10.1103/physrevb.50.7602] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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44
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Ming ZH, Krol A, Soo YL, Kao YH, Park JS, Wang KL. Microscopic structure of interfaces in Si1-xGex/Si heterostructures and superlattices studied by x-ray scattering and fluorescence yield. Phys Rev B Condens Matter 1993; 47:16373-16381. [PMID: 10006067 DOI: 10.1103/physrevb.47.16373] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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45
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Krol A, Soo YL, Huang S, Ming ZH, Kao YH, Munekata H, Chang LL. Local structure about Mn atoms in In1-xMnxAs diluted magnetic semiconductors. Phys Rev B Condens Matter 1993; 47:7187-7197. [PMID: 10004716 DOI: 10.1103/physrevb.47.7187] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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46
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Krol A, Soo YL, Ming ZH, Huang S, Kao YH, Smith GC, Lee K, James AC, Murphy DW. Local structure around F in the fluorine-doped Nd2CuO4 superconductor. Phys Rev B Condens Matter 1992; 46:443-447. [PMID: 10002229 DOI: 10.1103/physrevb.46.443] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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47
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Krol A, Lin CS, Soo YL, Ming ZH, Kao YH, Wang JH, Qi M, Smith GC. Soft-x-ray-absorption studies of Tl2Ba2Ca2Cu3O10- delta high-Tc superconductors. Phys Rev B Condens Matter 1992; 45:10051-10056. [PMID: 10000893 DOI: 10.1103/physrevb.45.10051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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48
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Chen CT, Sette F, Ma Y, Hybertsen MS, Stechel EB, Foulkes WM, Schulter M, Cheong SW, Cooper AS, Rupp LW, Batlogg B, Soo YL, Ming ZH, Krol A, Kao YH. Electronic states in La2-xSrxCuO4+ delta probed by soft-x-ray absorption. Phys Rev Lett 1991; 66:104-107. [PMID: 10043153 DOI: 10.1103/physrevlett.66.104] [Citation(s) in RCA: 131] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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