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Wu H, Zhang J, Zhu H, Li X, Liu H, Tang Z, Yao G, Yu J. Experimental and Density Functional Theory Simulation Research on PdO-SnO 2 Nanosheet Ethanol Gas Sensors. SENSORS (BASEL, SWITZERLAND) 2024; 24:4970. [PMID: 39124017 PMCID: PMC11314670 DOI: 10.3390/s24154970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2024] [Revised: 07/25/2024] [Accepted: 07/28/2024] [Indexed: 08/12/2024]
Abstract
Pure SnO2 and 1 at.% PdO-SnO2 materials were prepared using a simple hydrothermal method. The micromorphology and element valence state of the material were characterized using XRD, SEM, TEM, and XPS methods. The SEM results showed that the prepared material had a two-dimensional nanosheet morphology, and the formation of PdO and SnO2 heterostructures was validated through TEM. Due to the influence of the heterojunction, in the XPS test, the energy spectrum peaks of Sn and O in PdO-SnO2 were shifted by 0.2 eV compared with SnO2. The PdO-SnO2 sensor showed improved ethanol sensing performance compared to the pure SnO2 sensor, since it benefited from the large specific surface area of the nanosheet structure, the modulation effect of the PdO-SnO2 heterojunction on resistance, and the catalyst effect of PdO on the adsorption of oxygen. A DFT calculation study of the ethanol adsorption characteristics of the PdO-SnO2 surface was conducted to provide a detailed explanation of the gas-sensing mechanism. PdO was found to improve the reducibility of ethanol, enhance the adsorption of ethanol's methyl group, and increase the number of adsorption sites. A synergistic effect based on the continuous adsorption sites was also deduced.
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Affiliation(s)
- Hao Wu
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
| | - Jianwei Zhang
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
| | - Huichao Zhu
- School of Control Science and Engineering, Dalian University of Technology, Dalian 116024, China
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
| | - Xiaogan Li
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
- School of Microelectronics, Dalian University of Technology, Dalian 116024, China
| | - Hongxu Liu
- Cancer Hospital of Dalian University of Technology, Liaoning Cancer Hospital & Institute, Shenyang 110801, China
| | - Zhenan Tang
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Guanyu Yao
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Jun Yu
- Key Lab of Liaoning for Integrated Circuits and Medical Electronic Systems, Dalian University of Technology, Dalian 116024, China
- School of Biomedical Engineering, Dalian University of Technology, Dalian 116024, China
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Song Y, Shin MJ, Kwon BC, So J, Kim YJ, Kang D, Park NK, Kim M. Synergistic effects of copper and oxygen vacancies in enhancing the efficacy of partially crystalline CuMnxOy catalyst for ozone decomposition. J Chem Phys 2024; 160:234706. [PMID: 38888374 DOI: 10.1063/5.0212226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Accepted: 06/03/2024] [Indexed: 06/20/2024] Open
Abstract
To tackle the challenge of ground-level ozone pollution, this study proposed a potential catalytic design approach for ozone decomposition using Cu-Mn bimetallic oxide. This approach is grounded in an understanding of the intrinsic reactivity for catalyst and incorporates a novel potassium-driven low-temperature oxidation process for catalyst synthesis. The research highlights the creation of a highly reactive Cu-Mn oxide phase with extensive defect coverage, leading to significantly increased reaction rates. It also identifies the MnO2(100) facet as a crucial active phase, where oxygen vacancies simultaneously enhance O3 adsorption and decomposition, albeit with a concurrent risk of O2 poisoning due to the stabilization of adsorbed O2. Crucially, the incorporation of Cu offsets the effects of oxygen vacancies, influencing conversion rates and lessening O2 poisoning. The synergistic interplay between Cu and oxygen vacancies elevates the performance of the defect-rich Cu-Mn oxide catalyst. By combining computational and experimental methods, this study not only advances the understanding of the Cu-Mn oxide system for ozone decomposition but also contributes valuable insights into developing more efficient catalysts to mitigate ozone pollution.
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Affiliation(s)
- Yuna Song
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Min Jae Shin
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Byung Chan Kwon
- Institute of Clean Technology, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Jungseob So
- Environment and Sustainable Resources Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
| | - Young Jin Kim
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Daegu 41566, Republic of Korea
| | - Dohyung Kang
- Department of Future Energy Convergence, Seoul National University of Science and Technology, 232 Gongneung-Ro, Nowon-Gu, Seoul 01811, Republic of Korea
| | - No-Kuk Park
- Institute of Clean Technology, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Minkyu Kim
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
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Wu YW, Zhou XY, Mi TG, Hu Z, Xu MX, Zhang B, Zhao L, Lu Q. First-principles insights into the adsorption and interaction mechanism of selenium on selective catalytic reduction catalyst. CHEMOSPHERE 2021; 275:130057. [PMID: 33667766 DOI: 10.1016/j.chemosphere.2021.130057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/14/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
Selenium (Se) species can deposit in selective catalytic reduction (SCR) system during the denitrification process, which is harmful to the catalyst. To improve the Se-poisoning resistance of SCR catalysts, the influence mechanism of Se species on vanadium-titanium-based catalysts should be elucidated from an atomic scale. In this paper, theoretical calculations were conducted to reveal the adsorption and interaction mechanism of Se species on V2O5-WO3(MoO3)/TiO2 surface based on the first-principles. The impact of Se species on the electronic structure of the catalyst was investigated from electron transfer, bond formation, and VO site activity. The results show that the adsorption of elementary Se (Se0) belongs to chemisorption, while SeO2 can undergo both physisorption and chemisorption. For the chemisorption of Se species, obvious charge transfer with the catalyst is observed and Se-O bond is formed, which enhances the oxidation activity of the catalyst, triggers the reaction of Se0 and SeO2 with the catalyst components to generate SeVOx and SeW(Mo)Ox. The active sites are thereby damaged and the SCR performance is reduced. The above conclusions are mutually confirmed with the previous experimental research. By studying the correlation with the adsorption energies of Se species, descriptors manifesting the Se species adsorption were initially investigated to unveil the relationship between the electronic structure and the adsorption energy. Finally, the influence of temperature on Se adsorption was investigated. The adsorption can only proceed spontaneously below 500 K and is inhibited at high temperatures.
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Affiliation(s)
- Yang-Wen Wu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Xin-Yue Zhou
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Teng-Ge Mi
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Zhuang Hu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Ming-Xin Xu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Bing Zhang
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Li Zhao
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China
| | - Qiang Lu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, 102206, China.
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Mehar V, Kim M, Shipilin M, Van den Bossche M, Gustafson J, Merte LR, Hejral U, Grönbeck H, Lundgren E, Asthagiri A, Weaver JF. Understanding the Intrinsic Surface Reactivity of Single-Layer and Multilayer PdO(101) on Pd(100). ACS Catal 2018. [DOI: 10.1021/acscatal.8b02191] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vikram Mehar
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Minkyu Kim
- William G. Lowrie Chemical & Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Mikhail Shipilin
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - Maxime Van den Bossche
- Department of Physics and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Johan Gustafson
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - Lindsay R. Merte
- Materials Science and Applied Mathematics, Malmö University, SE-205 06 Malmö, Sweden
| | - Uta Hejral
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - Henrik Grönbeck
- Department of Physics and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Edvin Lundgren
- Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
| | - Aravind Asthagiri
- William G. Lowrie Chemical & Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jason F. Weaver
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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