1
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Shabbir B, Jabbour K, Manzoor S, Ashiq MF, Fawy KF, Ashiq MN. Solvothermally designed Pr-MOF/Fe 2O 3 based nanocomposites for efficient electrocatalytic water splitting. Heliyon 2023; 9:e20261. [PMID: 37842581 PMCID: PMC10568344 DOI: 10.1016/j.heliyon.2023.e20261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 08/24/2023] [Accepted: 09/17/2023] [Indexed: 10/17/2023] Open
Abstract
To meet the energy demand of modern civilization, efforts to find renewable, safe, and highly effective fuel generation are still a big challenge. The oxygen evolution reaction (OER) is one of many modern technologies for hydrogen generation, and a number of new electrode materials have been created to increase the effectiveness of O2 evolution. This project utilizes a range of high performance nanomaterials, such as Pr-MOF, Fe2O3, and Pr-MOF/Fe2O3, to carry out the oxygen evolution reaction. This study shows that Pr-MOF/Fe2O3 exhibits exceptional electrocatalytic activity in alkaline solution with 238 mV overpotential at the current density of 10 mA cm-2 and a Tafel slope of 37 mV dec-1 which is much lower when compared to pure Pr-MOF and Fe2O3. The enhanced electrochemical results are due to the higher electrochemical surface area of 237 cm2. This work will lay the foundation for an approach to enhance the crystalline nature of surface-active nanoparticles made from rare earth MOFs for a range of electrochemical energy applications.
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Affiliation(s)
- Bushra Shabbir
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Karam Jabbour
- College of Engineering and Technology, American University of the Middle East, Kuwait
| | - Sumaira Manzoor
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Faheem Ashiq
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Khaled Fahmi Fawy
- Department of Chemistry, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
| | - Muhammad Naeem Ashiq
- Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
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2
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Uecker J, Unachukwu ID, Vibhu V, Vinke IC, Eichel RA, (Bert) de Haart L. Performance, electrochemical process analysis and degradation of gadolinium doped ceria as fuel electrode material for solid oxide electrolysis cells. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
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3
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Ye L, Shang Z, Xie K. Selective Oxidative Coupling of Methane to Ethylene in a Solid Oxide Electrolyser Based on Porous Single‐Crystalline CeO
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Monoliths. Angew Chem Int Ed Engl 2022; 61:e202207211. [DOI: 10.1002/anie.202207211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Lingting Ye
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
- Advanced Energy Science and Technology Guangdong Laboratory 29 Sanxin North Road Huizhou Guangdong 116023 China
| | - Zhibo Shang
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Kui Xie
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
- Advanced Energy Science and Technology Guangdong Laboratory 29 Sanxin North Road Huizhou Guangdong 116023 China
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4
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Tabish A, Patel H, Mani A, Schoonman J, Aravind P. Effect of H2S and HCl contaminants on nickel and ceria pattern anode solid oxide fuel cells. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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5
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Ye L, Shang Z, Xie K. Selective Oxidative Coupling of Methane to Ethylene in a Solid Oxide Electrolyser Based on Porous Single‐Crystalline CeO
2
Monoliths. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Lingting Ye
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
- Advanced Energy Science and Technology Guangdong Laboratory 29 Sanxin North Road Huizhou Guangdong 116023 China
| | - Zhibo Shang
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Kui Xie
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
- Advanced Energy Science and Technology Guangdong Laboratory 29 Sanxin North Road Huizhou Guangdong 116023 China
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6
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Safi NA, Li Y, Yu B, Liu P, Wang J, Ge H, Zhang K. The dependance of high catalytic performance on the tunable oxygen vacancy in the CZ
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S/Zn‐HZSM‐5 bifunctional catalyst for alkylation of benzene and syngas. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Naseer Ahmad Safi
- College of Chemistry & Chemical Engineering Taiyuan University of Technology Taiyuan PR China
| | - Yanchun Li
- College of Chemistry & Chemical Engineering Taiyuan University of Technology Taiyuan PR China
| | - Bo Yu
- College of Chemistry & Chemical Engineering Taiyuan University of Technology Taiyuan PR China
| | - Ping Liu
- Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan PR China
| | - Junwen Wang
- College of Chemistry & Chemical Engineering Taiyuan University of Technology Taiyuan PR China
| | - Hui Ge
- Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan PR China
| | - Kan Zhang
- Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan PR China
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7
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Lee K, Kim S, Sun S, Lee G, Kwon J, Hwang J, Seo J, Paik U, Song T. Hydrogenated ceria nanoparticles for high-efficiency silicate adsorption. NEW J CHEM 2022. [DOI: 10.1039/d2nj04043c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The enriched Ce3+ ions were confirmed on the surface of hydrogenated ceria nanoparticles which play a key role as active sites in various chemical reactions including silicate adsorption.
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Affiliation(s)
- Kangchun Lee
- Foundry Process Development Team, Semiconductor R&D Center, Samsung Electronics, Hwaseong, Korea
| | - Sungmin Kim
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Seho Sun
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Ganggyu Lee
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Jiseok Kwon
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Junha Hwang
- Department of Energy Engineering, Hanyang University, Seoul, Korea
- Material R&D Center, KCTech, Hwaseong, Korea
| | - Jihoon Seo
- Department of Chemical and Biomolecular Engineering, Clarkson University, New York, USA
| | - Ungyu Paik
- Department of Energy Engineering, Hanyang University, Seoul, Korea
| | - Taeseup Song
- Department of Energy Engineering, Hanyang University, Seoul, Korea
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8
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Ioannidou E, Chavani M, Neophytides S, Niakolas D. Effect of the PH2O/PCO2 and PH2 on the intrinsic electro-catalytic interactions and the CO production pathway on Ni/GDC during solid oxide H2O/CO2 co-electrolysis. J Catal 2021. [DOI: 10.1016/j.jcat.2021.09.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Toghan A, Greiner M, Knop-Gericke A, Imbihl R. Identification of the surface species in electrochemical promotion: ethylene oxidation over a Pt/YSZ catalyst. Phys Chem Chem Phys 2021; 23:21591-21598. [PMID: 34557885 DOI: 10.1039/d1cp02757c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) as an in situ method. The electrochemical promoter effect is linked to the presence of a several layers thick graphitic overlayer that forms on the Pt surface in the presence of C2H4. Our NAP-XPS investigation reveals that electrochemical pumping of the Pt/YSZ catalyst, using a positive potential, leads to the spillover of oxygen surface species from the YSZ support onto the surface of the Pt electrode. Based on the XP spectra, the spillover species on Pt is identical to oxygen chemisorbed from the gas-phase.
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Affiliation(s)
- Arafat Toghan
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3A, D-30167 Hannover, Germany. .,Chemistry Department, Faculty of Science, South Valley University, 83523 Qena, Egypt
| | - Mark Greiner
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34 - 36, 445470 Mülheim an der Ruhr, Germany
| | - Axel Knop-Gericke
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Abteilung Anorganische Chemie, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Ronald Imbihl
- Institut für Physikalische Chemie und Elektrochemie, Leibniz-Universität Hannover, Callinstrasse 3A, D-30167 Hannover, Germany.
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10
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Ye L, Duan X, Xie K. Electrochemical Oxidative Dehydrogenation of Ethane to Ethylene in a Solid Oxide Electrolyzer. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109355] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Lingting Ye
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Xiuyun Duan
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Kui Xie
- Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Key Laboratory of Design & Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
- Advanced Energy Science and Technology Guangdong Laboratory 29 Sanxin North Road, Huizhou Guangdong 116023 China
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11
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Ye L, Duan X, Xie K. Electrochemical Oxidative Dehydrogenation of Ethane to Ethylene in a Solid Oxide Electrolyzer. Angew Chem Int Ed Engl 2021; 60:21746-21750. [PMID: 34346541 DOI: 10.1002/anie.202109355] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Indexed: 11/07/2022]
Abstract
Oxidative dehydrogenation of ethane to ethylene is an important process in light olefin industry; however, the over-oxidation of ethane leads to low ethylene selectivity. Here, we report a novel approach to electrochemical oxidative dehydrogenation of ethane in anode in conjunction with CO2 reduction at cathode in a solid oxide electrolyser using a porous single-crystalline CeO2 electrode at 600 °C. We identify and engineer the flux and chemical states of active oxygen species that evolve from the lattice at anode surface to activate and dehydrogenate ethane to ethylene via the reaction of epoxy species. Active oxygen species (O2- , O2 2- and O2 - ) at the anode surface effectively dehydrogenate ethane to ethylene, but O- species tend to induce deep oxidation. We demonstrate exceptionally high ethylene selectivity of 95 % and an ethane conversion of 10 % with a durable operation of 300 h.
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Affiliation(s)
- Lingting Ye
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
| | - Xiuyun Duan
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
| | - Kui Xie
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.,Key Laboratory of Design & Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.,Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, China.,Advanced Energy Science and Technology Guangdong Laboratory, 29 Sanxin North Road, Huizhou, Guangdong, 116023, China
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12
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Zhang J, Lei L, Li H, Chen F, Han M. A practical approach for identifying various polarization behaviors of redox-stable electrodes in symmetrical solid oxide fuel cells. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138340] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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13
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Agarwal RG, Kim HJ, Mayer JM. Nanoparticle O-H Bond Dissociation Free Energies from Equilibrium Measurements of Cerium Oxide Colloids. J Am Chem Soc 2021; 143:2896-2907. [PMID: 33565871 DOI: 10.1021/jacs.0c12799] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A novel equilibrium strategy for measuring the hydrogen atom affinity of colloidal metal oxide nanoparticles is presented. Reactions between oleate-capped cerium oxide nanoparticle colloids (nanoceria) and organic proton-coupled electron transfer (PCET) reagents are used as a model system. Nanoceria redox changes, or hydrogen loadings, and overall reaction stoichiometries were followed by both 1H NMR and X-ray absorption near-edge spectroscopies. These investigations revealed that, in many cases, reactions between nanoceria and PCET reagents reach equilibrium states with good mass balance. Each equilibrium state is a direct measure of the bond strength, or bond dissociation free energy (BDFE), between nanoceria and hydrogen. Further studies, including those with larger nanoceria, indicated that the relevant bond is a surface O-H. Thus, we have measured surface O-H BDFEs for nanoceria-the first experimental BDFEs for any nanoscale metal oxide. Remarkably, the measured CeO-H BDFEs span 13 kcal mol-1 (0.56 eV) with changes in the average redox state of the nanoceria colloid. Possible chemical models for this strong dependence are discussed. We propose that the tunability of ceria BDFEs may be important in explaining its effectiveness in catalysis. More generally, metal oxide BDFEs have been used as predictors of catalyst efficacy that, traditionally, have only been accessible by computational methods. These results provide important experimental benchmarks for metal oxide BDFEs and demonstrate that the concepts of molecular bond strength thermochemistry can be applied to nanoscale materials.
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Affiliation(s)
- Rishi G Agarwal
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - Hyun-Jo Kim
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
| | - James M Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States
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14
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Han Y, Zhang H, Yu Y, Liu Z. In Situ Characterization of Catalysis and Electrocatalysis Using APXPS. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04251] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yong Han
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Hui Zhang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
| | - Yi Yu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
| | - Zhi Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
- Center for Transformative Science, ShanghaiTech University, Shanghai 201210, China
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15
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Williams NJ, Seymour ID, Leah RT, Mukerjee S, Selby M, Skinner SJ. Theory of the electrostatic surface potential and intrinsic dipole moments at the mixed ionic electronic conductor (MIEC)-gas interface. Phys Chem Chem Phys 2021; 23:14569-14579. [PMID: 33988196 DOI: 10.1039/d1cp01639c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The local activation overpotential describes the electrostatic potential shift away from equilibrium at an electrode/electrolyte interface. This electrostatic potential is not entirely satisfactory for describing the reaction kinetics of a mixed ionic-electronic conducting (MIEC) solid-oxide cell (SOC) electrode where charge transfer occurs at the electrode-gas interface. Using the theory of the electrostatic potential at the MIEC-gas interface as an electrochemical driving force, charge transfer at the ceria-gas interface has been modelled based on the intrinsic dipole potential of the adsorbate. This model gives a physically meaningful reason for the enhancement in electrochemical activity of a MIEC electrode as the steam and hydrogen pressure is increased in both fuel cell and electrolysis modes. This model was validated against operando XPS data from previous literature to accurately predict the outer work function shift of thin film Sm0.2Ce0.8O1.9 in a H2/H2O atmosphere as a function of overpotential.
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Affiliation(s)
- Nicholas J Williams
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
| | - Ieuan D Seymour
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
| | - Robert T Leah
- Ceres Power Ltd, Viking House, Foundry Lane, Horsham, RH13 5PX, UK
| | | | - Mark Selby
- Ceres Power Ltd, Viking House, Foundry Lane, Horsham, RH13 5PX, UK
| | - Stephen J Skinner
- Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
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16
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Novel Sample-Stage for Combined Near Ambient Pressure X-ray Photoelectron Spectroscopy, Catalytic Characterization and Electrochemical Impedance Spectroscopy. CRYSTALS 2020. [DOI: 10.3390/cryst10100947] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
For an in-depth characterization of catalytic materials and their properties, spectroscopic in-situ (operando) investigations are indispensable. With the rapid development of advanced commercial spectroscopic equipment, it is possible to combine complementary methods in a single system. This allows for simultaneously gaining insights into surface and bulk properties of functional oxides, such as defect chemistry, catalytic characteristics, electronic structure, etc., enabling a direct correlation of structure and reactivity of catalyst materials, thus facilitating effective catalyst development. Here, we present a novel sample-stage, which was specifically developed to pave the way to a lab–based combination of near ambient pressure X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy with simultaneous catalytic operando measurements. This setup is designed to probe different (model) systems under conditions close to real heterogeneous catalysis, with a focus on solid oxide electrochemical cells. In a proof of concept experiment using an electrochemical model cell with the doped perovskite Nd0.6Ca0.4Fe0.9Co0.1O3-δ as working electrode, the precise control of the surface chemistry that is possible with this setup is demonstrated. The exsolution behavior of the material was studied, showing that at a lower temperature (500 °C) with lower reducing potential of the gas phase, only cobalt was exsolved, forming metallic particles on the surface of the perovskite-type oxide. Only when the temperature was increased to 600 °C and a cathodic potential was applied (−250 mV) Fe also started to be released from the perovskite lattice.
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17
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Dejoie C, Yu Y, Bernardi F, Tamura N, Kunz M, Marcus MA, Huang YL, Zhang C, Eichhorn BW, Liu Z. Potential Control of Oxygen Non-Stoichiometry in Cerium Oxide and Phase Transition Away from Equilibrium. ACS APPLIED MATERIALS & INTERFACES 2020; 12:31514-31521. [PMID: 32559058 DOI: 10.1021/acsami.0c08284] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cerium oxide (ceria, CeO2) is a technologically important material for energy conversion applications. Its activities strongly depend on redox states and oxygen vacancy concentration. Understanding the functionality of chemical active species and behavior of oxygen vacancy during operation, especially in high-temperature solid-state electrochemical cells, is the key to advance future material design. Herein, the structure evolution of ceria is spatially resolved using bulk-sensitive operando X-ray diffraction and spectroscopy techniques. During water electrolysis, ceria undergoes reduction, and its oxygen non-stoichiometry shows a dependence on the electrochemical current. Cerium local bonding environments vary concurrently to accommodate oxygen vacancy formation, resulting in changes in Ce-O coordination number and Ce3+/Ce4+ redox couple. When reduced enough, a crystallographic phase transition occurs from α to an α' phase with more oxygen vacancies. Nevertheless, the transition behavior is intriguingly different from the one predicted in the standard phase diagram of ceria. This paper demonstrates a feasible means to control oxygen non-stoichiometry in ceria via electrochemical potential. It also sheds light on the mechanism of phase transitions induced by electrochemical potential. For electrochemical systems, effects from a large-scale electrical environment should be taken into consideration, besides effective oxygen partial pressure and temperature.
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Affiliation(s)
- Catherine Dejoie
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, Grenoble Cedex 9 38043, France
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Yi Yu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Fabiano Bernardi
- Programa de Pós-Graduação em Física, Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, Rio Grande do Sul, Brazil
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Nobumichi Tamura
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Martin Kunz
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Matthew A Marcus
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Yi-Lin Huang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Chunjuan Zhang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Bryan W Eichhorn
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Zhi Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
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18
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Xu Z, Hu X, Wan Y, Xue S, Zhang S, Zhang L, Zhang B, Xia C. Electrochemical performance and anode reaction process for Ca doped Sr2Fe1·5Mo0·5O6-δ as electrodes for symmetrical solid oxide fuel cells. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136067] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Ceria-Based Catalysts Studied by Near Ambient Pressure X-ray Photoelectron Spectroscopy: A Review. Catalysts 2020. [DOI: 10.3390/catal10030286] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The development of better catalysts is a passionate topic at the forefront of modern science, where operando techniques are necessary to identify the nature of the active sites. The surface of a solid catalyst is dynamic and dependent on the reaction environment and, therefore, the catalytic active sites may only be formed under specific reaction conditions and may not be stable either in air or under high vacuum conditions. The identification of the active sites and the understanding of their behaviour are essential information towards a rational catalyst design. One of the most powerful operando techniques for the study of active sites is near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), which is particularly sensitive to the surface and sub-surface of solids. Here we review the use of NAP-XPS for the study of ceria-based catalysts, widely used in a large number of industrial processes due to their excellent oxygen storage capacity and well-established redox properties.
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20
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V VM, Nageswaran G. Operando X-Ray Spectroscopic Techniques: A Focus on Hydrogen and Oxygen Evolution Reactions. Front Chem 2020; 8:23. [PMID: 32083053 PMCID: PMC7002430 DOI: 10.3389/fchem.2020.00023] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/09/2020] [Indexed: 11/22/2022] Open
Abstract
The study of structural as well as chemical properties of an electrocatalyst in its reaction environment is a challenge in electrocatalysis. This is very important for the better understanding of the dynamic changes in the reactivity with respect to the structure of catalysts to give insight into the reaction mechanism. The in situ/operando investigation of electrode/electrolyte interface has been increasingly explored in recent days due to the significant developments in technology. The review focus on operando X-ray spectroscopic techniques to understand the behavior of electrocatalysts in hydrogen evolution and oxygen evolution reactions (HER and OER). Some recent studies on the application of operando X-ray spectroscopic methods to study the dynamic nature as well as the evaluation of structural and chemical changes of the electrocatalysts for HER and OER in different reaction environment are discussed.
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Affiliation(s)
- Varsha M V
- Indian Institute of Space Science and Technology, Thiruvananthapuram, India
| | - Gomathi Nageswaran
- Indian Institute of Space Science and Technology, Thiruvananthapuram, India
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21
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Choi Y, Cha SK, Ha H, Lee S, Seo HK, Lee JY, Kim HY, Kim SO, Jung W. Unravelling inherent electrocatalysis of mixed-conducting oxide activated by metal nanoparticle for fuel cell electrodes. NATURE NANOTECHNOLOGY 2019; 14:245-251. [PMID: 30778213 DOI: 10.1038/s41565-019-0367-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 01/04/2019] [Indexed: 05/21/2023]
Abstract
Highly active metal nanoparticles are desired to serve in high-temperature electrocatalysis, for example, in solid oxide electrochemical cells. Unfortunately, the low thermal stability of nanosized particles and the sophisticated interface requirement for electrode structures to support concurrent ionic and electronic transport make it hard to identify the exact catalytic role of nanoparticles embedded within complex electrode architectures. Here we present an accurate analysis of the reactivity of oxide electrodes boosted by metal nanoparticles, where all particles participate in the reaction. Monodisperse particles (Pt, Pd, Au and Co), 10 nm in size and stable at high temperature (more than 600 °C), are uniformly distributed onto mixed-conducting oxide electrodes as a model electrochemical cell via self-assembled nanopatterning. We identify how the metal catalysts activate hydrogen electrooxidation on the ceria-based electrode surface and quantify how rapidly the reaction rate increases with proper choice of metal. These results suggest an ideal electrode design for high-temperature electrochemical applications.
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Affiliation(s)
- Yoonseok Choi
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Seung Keun Cha
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon, Republic of Korea
| | - Hyunwoo Ha
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, Republic of Korea
| | - Siwon Lee
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Hyeon Kook Seo
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, Republic of Korea
| | - Jeong Yong Lee
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, Republic of Korea
| | - Hyun You Kim
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, Republic of Korea.
| | - Sang Ouk Kim
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea.
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon, Republic of Korea.
| | - WooChul Jung
- Department of Materials Science and Engineering, KAIST, Daejeon, Republic of Korea.
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22
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Poudyal S, Laursen S. Photocatalytic CO2 reduction by H2O: insights from modeling electronically relaxed mechanisms. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02046a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding of the ground-state surface reaction mechanism for photocatalytic CO2 reduction and new connections between catalyst surface reactivity and experimentally observed activity and selectivity are presented to facilitate the development of catalysts that exhibit improved activity, controlled product distributions, and enhanced quantum yield.
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Affiliation(s)
- Samiksha Poudyal
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
| | - Siris Laursen
- Department of Chemical and Biomolecular Engineering
- University of Tennessee
- Knoxville
- USA
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23
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Jarry A, Ricote S, Geller A, Pellegrinelli C, Zhang X, Stewart D, Takeuchi I, Wachsman E, Crumlin EJ, Eichhorn B. Assessing Substitution Effects on Surface Chemistry by in Situ Ambient Pressure X-ray Photoelectron Spectroscopy on Perovskite Thin Films, BaCe xZr 0.9- xY 0.1O 2.95 ( x = 0; 0.2; 0.9). ACS APPLIED MATERIALS & INTERFACES 2018; 10:37661-37670. [PMID: 30281275 DOI: 10.1021/acsami.8b12546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Performance of proton-solid oxide fuel cells (H+-SOFC) is governed by ion transport through solid/gas interfaces. Major breakthroughs are then intrinsically linked to a detailed understanding of how parameters tailoring bulk proton conductivity affect surface chemistry in situ, at an early stage. In this work, we studied proton and oxygen transport at the interface between H+-SOFC electrolyte BaCe xZr0.9- xY0.1O2.95 ( x = 0; 0.2; 0.9) thin films and the gas (100 mTorr of H2O and O2) by using synchrotron-based ambient pressure X-ray photoelectron spectroscopy at operating temperature (>400 °C). We developed highly textured BaCe xZr0.9- xY0.1O2.95 epitaxial thin films, which exhibit high level of in-plane proton conductivity, that is, up to 0.08 S cm-1 at 500 °C for x = 0.9. Upon applying 100 mTorr water partial pressure above 300 °C, major changes are observed only in the O 1s and Y 3d core level spectra, with a clear Zr/Ce ratio dependency. OH- formation is favored by Ce content while initiated near Y. Hydration is also associated with surface secondary phase growth comprising oxygen-under-coordinated yttrium and/or yttrium hydroxide. With BaCe0.2Zr0.7Y0.1O2.95, high levels of ionic conductivities and chemical stability are obtained as a result of the optimized surface reaction kinetics, with low activation energy barrier for proton transport while restraining formation of OH-/SO42- adsorb species.
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Affiliation(s)
- Angelique Jarry
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Sandrine Ricote
- Mechanical Engineering Department , Colorado School of Mines , Golden , Colorado 80401 , United States
| | | | | | | | | | | | | | - Ethan J Crumlin
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
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24
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Cho WC, Poo KM, Mohamed HO, Kim TN, Kim YS, Hwang MH, Jung DW, Chae KJ. Non-selective rapid electro-oxidation of persistent, refractory VOCs in industrial wastewater using a highly catalytic and dimensionally stable IrPd/Ti composite electrode. CHEMOSPHERE 2018; 206:483-490. [PMID: 29778073 DOI: 10.1016/j.chemosphere.2018.05.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/27/2018] [Accepted: 05/10/2018] [Indexed: 06/08/2023]
Abstract
Volatile organic compounds (VOCs) are highly toxic contaminants commonly dissolved in industrial wastewater. Therefore, treatment of VOC-containing wastewater requires a robust and rapid reaction because liquid VOCs can become volatile secondary pollutants. In this study, electro-oxidation with catalytic composite dimensionally stable anodes (DSAs)-a promising process for degrading organic pollutants-was applied to remove various VOCs (chloroform, benzene, toluene, and trichloroethylene). Excellent treatment efficiency of VOCs was demonstrated. To evaluate the VOC removal rate of each DSA, a titanium plate, a frequently used substratum, was coated with four different highly electrocatalytic composite materials (platinum group metals), Ir, IrPt, IrRu, and IrPd. Ir was used as a base catalyst to maintain the electrochemical stability of the anode. Current density and electrolyte concentration were evaluated over various ranges (20-45 mA/cm2 and 0.01-0.15 mol/L as NaCl, respectively) to determine the optimum operating condition. Results indicated that chloroform was the most refractory VOC tested due to its robust chemical bond strength. Moreover, the optimum current density and electrolyte concentration were 25 mA/cm2 and 0.05 M, respectively, representing the most cost-effective condition. Four DSAs were examined (Ir/Ti, IrPt/Ti, IrRu/Ti, and IrPd/Ti). The IrPd/Ti anode was the most suitable for treatment of VOCs presenting the highest chloroform removal performance of 78.8%, energy consumption of 0.38 kWh per unit mass (g) of oxidized chloroform, and the least volatilized fraction of 4.4%. IrPd/Ti was the most suitable anode material for VOC treatment because of its unique structure, high wettability, and high surface area.
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Affiliation(s)
- Wan-Cheol Cho
- Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, Republic of Korea
| | - Kyung-Min Poo
- Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, Republic of Korea
| | - Hend Omar Mohamed
- Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, Republic of Korea
| | - Tae-Nam Kim
- Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, Republic of Korea
| | - Yul-Seong Kim
- Department of Logistics System Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan 49112, Republic of Korea
| | - Moon Hyun Hwang
- Headquarter of Research Plan, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Do-Won Jung
- Technique Laboratory, Techwin Co., 60 Jikji-daero 474 beon-gil, Heungdeok-gu, Cheongju-city, Chungbuk 28580, Republic of Korea
| | - Kyu-Jung Chae
- Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan, 49112, Republic of Korea.
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25
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Tabish A, Patel H, Schoonman J, Aravind P. A detailed look into hydrogen electrochemical oxidation on ceria anodes. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.05.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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26
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Hegemann C, Heidemann T, Pantenburg I, Mathur S. Influence of Metal Fragment Mobility and Solution Dynamics on Cationic Rearrangements in Multimetallic Alkoxide Frameworks. ChemistrySelect 2018. [DOI: 10.1002/slct.201702252] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Corinna Hegemann
- Institute of Inorganic Chemistry; University of Cologne; Greinstrasse 6 50939 Cologne Germany
| | - Tim Heidemann
- Institute of Inorganic Chemistry; University of Cologne; Greinstrasse 6 50939 Cologne Germany
| | - Ingo Pantenburg
- Institute of Inorganic Chemistry; University of Cologne; Greinstrasse 6 50939 Cologne Germany
| | - Sanjay Mathur
- Institute of Inorganic Chemistry; University of Cologne; Greinstrasse 6 50939 Cologne Germany
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27
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Opitz AK, Nenning A, Rameshan C, Kubicek M, Götsch T, Blume R, Hävecker M, Knop-Gericke A, Rupprechter G, Klötzer B, Fleig J. Surface Chemistry of Perovskite-Type Electrodes During High Temperature CO 2 Electrolysis Investigated by Operando Photoelectron Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35847-35860. [PMID: 28933825 PMCID: PMC5740481 DOI: 10.1021/acsami.7b10673] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 09/21/2017] [Indexed: 05/28/2023]
Abstract
Any substantial move of energy sources from fossil fuels to renewable resources requires large scale storage of excess energy, for example, via power to fuel processes. In this respect electrochemical reduction of CO2 may become very important, since it offers a method of sustainable CO production, which is a crucial prerequisite for synthesis of sustainable fuels. Carbon dioxide reduction in solid oxide electrolysis cells (SOECs) is particularly promising owing to the high operating temperature, which leads to both improved thermodynamics and fast kinetics. Additionally, compared to purely chemical CO formation on oxide catalysts, SOECs have the outstanding advantage that the catalytically active oxygen vacancies are continuously formed at the counter electrode, and move to the working electrode where they reactivate the oxide surface without the need of a preceding chemical (e.g., by H2) or thermal reduction step. In the present work, the surface chemistry of (La,Sr)FeO3-δ and (La,Sr)CrO3-δ based perovskite-type electrodes was studied during electrochemical CO2 reduction by means of near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) at SOEC operating temperatures. These measurements revealed the formation of a carbonate intermediate, which develops on the oxide surface only upon cathodic polarization (i.e., under sufficiently reducing conditions). The amount of this adsorbate increases with increasing oxygen vacancy concentration of the electrode material, thus suggesting vacant oxygen lattice sites as the predominant adsorption sites for carbon dioxide. The correlation of carbonate coverage and cathodic polarization indicates that an electron transfer is required to form the carbonate and thus to activate CO2 on the oxide surface. The results also suggest that acceptor doped oxides with high electron concentration and high oxygen vacancy concentration may be particularly suited for CO2 reduction. In contrast to water splitting, the CO2 electrolysis reaction was not significantly affected by metallic particles, which were exsolved from the perovskite electrodes upon cathodic polarization. Carbon formation on the electrode surface was only observed under very strong cathodic conditions, and the carbon could be easily removed by retracting the applied voltage without damaging the electrode, which is particularly promising from an application point of view.
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Affiliation(s)
- Alexander K. Opitz
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Andreas Nenning
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Christoph Rameshan
- Institute of Materials Chemistry, Vienna
University of Technology, Getreidemarkt 9/165-PC, 1060 Vienna, Austria
| | - Markus Kubicek
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Thomas Götsch
- Institute of Physical
Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Raoul Blume
- Department of Inorganic Chemistry, Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Michael Hävecker
- Department of Inorganic Chemistry, Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Axel Knop-Gericke
- Department of Inorganic Chemistry, Fritz
Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Günther Rupprechter
- Institute of Materials Chemistry, Vienna
University of Technology, Getreidemarkt 9/165-PC, 1060 Vienna, Austria
| | - Bernhard Klötzer
- Institute of Physical
Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Jürgen Fleig
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
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28
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Zurhelle AF, Tong X, Klein A, Mebane DS, De Souza RA. A Space-Charge Treatment of the Increased Concentration of Reactive Species at the Surface of a Ceria Solid Solution. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Xiaorui Tong
- Department of Mechanical and Aerospace Engineering; West Virginia University; Morgantown WV 26506 USA
| | - Andreas Klein
- Institute of Materials Science; TU Darmstadt; 64287 Darmstadt Germany
| | - David S. Mebane
- Department of Mechanical and Aerospace Engineering; West Virginia University; Morgantown WV 26506 USA
| | - Roger A. De Souza
- Institute of Physical Chemistry; RWTH Aachen University; 52074 Aachen Germany
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29
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Zurhelle AF, Tong X, Klein A, Mebane DS, De Souza RA. A Space-Charge Treatment of the Increased Concentration of Reactive Species at the Surface of a Ceria Solid Solution. Angew Chem Int Ed Engl 2017; 56:14516-14520. [DOI: 10.1002/anie.201708118] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 09/14/2017] [Indexed: 11/11/2022]
Affiliation(s)
| | - Xiaorui Tong
- Department of Mechanical and Aerospace Engineering; West Virginia University; Morgantown WV 26506 USA
| | - Andreas Klein
- Institute of Materials Science; TU Darmstadt; 64287 Darmstadt Germany
| | - David S. Mebane
- Department of Mechanical and Aerospace Engineering; West Virginia University; Morgantown WV 26506 USA
| | - Roger A. De Souza
- Institute of Physical Chemistry; RWTH Aachen University; 52074 Aachen Germany
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30
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Papaefthimiou V, Niakolas DK, Paloukis F, Teschner D, Knop-Gericke A, Haevecker M, Zafeiratos S. Operando observation of nickel/ceria electrode surfaces during intermediate temperature steam electrolysis. J Catal 2017. [DOI: 10.1016/j.jcat.2017.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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32
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Jiang W, Yang J, Liu YY, Song SY, Ma JF. A Porphyrin-Based PorousrtlMetal-Organic Framework as an Efficient Catalyst for the Cycloaddition of CO2to Epoxides. Chemistry 2016; 22:16991-16997. [DOI: 10.1002/chem.201603465] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Wei Jiang
- Key Lab of Polyoxometalate Science; Department of Chemistry; Northeast Normal University; Changchun 130024 P. R. China
| | - Jin Yang
- Key Lab of Polyoxometalate Science; Department of Chemistry; Northeast Normal University; Changchun 130024 P. R. China
| | - Ying-Ying Liu
- Key Lab of Polyoxometalate Science; Department of Chemistry; Northeast Normal University; Changchun 130024 P. R. China
| | - Shu-Yan Song
- State Key Laboratory of Rare Earth Resource Utilization; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China
| | - Jian-Fang Ma
- Key Lab of Polyoxometalate Science; Department of Chemistry; Northeast Normal University; Changchun 130024 P. R. China
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33
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Gerstl M, Nenning A, Iskandar R, Rojek-Wöckner V, Bram M, Hutter H, Opitz AK. The Sulphur Poisoning Behaviour of Gadolinia Doped Ceria Model Systems in Reducing Atmospheres. MATERIALS (BASEL, SWITZERLAND) 2016; 9:E649. [PMID: 28773771 PMCID: PMC5509099 DOI: 10.3390/ma9080649] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 07/07/2016] [Accepted: 07/12/2016] [Indexed: 11/18/2022]
Abstract
An array of analytical methods including surface area determination by gas adsorption using the Brunauer, Emmett, Teller (BET) method, combustion analysis, XRD, ToF-SIMS, TEM and impedance spectroscopy has been used to investigate the interaction of gadolinia doped ceria (GDC) with hydrogen sulphide containing reducing atmospheres. It is shown that sulphur is incorporated into the GDC bulk and might lead to phase changes. Additionally, high concentrations of silicon are found on the surface of model composite microelectrodes. Based on these data, a model is proposed to explain the multi-facetted electrochemical degradation behaviour encountered during long term electrochemical measurements. While electrochemical bulk properties of GDC stay largely unaffected, the surface polarisation resistance is dramatically changed, due to silicon segregation and reaction with adsorbed sulphur.
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Affiliation(s)
- Matthias Gerstl
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164-EC, Vienna A-1060, Austria.
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Getreidemarkt 9/164-EC, Vienna 1060, Austria.
| | - Andreas Nenning
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164-EC, Vienna A-1060, Austria.
| | - Riza Iskandar
- Central Facility for Electron Microscopy (GFE), RWTH Aachen University, Ahornstraße 55, Aachen 52074, Germany.
| | - Veronika Rojek-Wöckner
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Getreidemarkt 9/164-EC, Vienna 1060, Austria.
- Plansee SE, Innovation Services, Reutte 6600, Austria.
| | - Martin Bram
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Getreidemarkt 9/164-EC, Vienna 1060, Austria.
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Jülich 52425, Germany.
| | - Herbert Hutter
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164-EC, Vienna A-1060, Austria.
| | - Alexander Karl Opitz
- Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164-EC, Vienna A-1060, Austria.
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Getreidemarkt 9/164-EC, Vienna 1060, Austria.
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34
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Colic V, Pohl MD, Scieszka D, Bandarenka AS. Influence of the electrolyte composition on the activity and selectivity of electrocatalytic centers. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.08.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Nenning A, Opitz AK, Rameshan C, Rameshan R, Blume R, Hävecker M, Knop-Gericke A, Rupprechter G, Klötzer B, Fleig J. Ambient Pressure XPS Study of Mixed Conducting Perovskite-Type SOFC Cathode and Anode Materials under Well-Defined Electrochemical Polarization. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:1461-1471. [PMID: 26877827 PMCID: PMC4735809 DOI: 10.1021/acs.jpcc.5b08596] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 11/19/2015] [Indexed: 05/30/2023]
Abstract
The oxygen exchange activity of mixed conducting oxide surfaces has been widely investigated, but a detailed understanding of the corresponding reaction mechanisms and the rate-limiting steps is largely still missing. Combined in situ investigation of electrochemically polarized model electrode surfaces under realistic temperature and pressure conditions by near-ambient pressure (NAP) XPS and impedance spectroscopy enables very surface-sensitive chemical analysis and may detect species that are involved in the rate-limiting step. In the present study, acceptor-doped perovskite-type La0.6Sr0.4CoO3-δ (LSC), La0.6Sr0.4FeO3-δ (LSF), and SrTi0.7Fe0.3O3-δ (STF) thin film model electrodes were investigated under well-defined electrochemical polarization as cathodes in oxidizing (O2) and as anodes in reducing (H2/H2O) atmospheres. In oxidizing atmosphere all materials exhibit additional surface species of strontium and oxygen. The polaron-type electronic conduction mechanism of LSF and STF and the metal-like mechanism of LSC are reflected by distinct differences in the valence band spectra. Switching between oxidizing and reducing atmosphere as well as electrochemical polarization cause reversible shifts in the measured binding energy. This can be correlated to a Fermi level shift due to variations in the chemical potential of oxygen. Changes of oxidation states were detected on Fe, which appears as FeIII in oxidizing atmosphere and as mixed FeII/III in H2/H2O. Cathodic polarization in reducing atmosphere leads to the reversible formation of a catalytically active Fe0 phase.
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Affiliation(s)
- Andreas Nenning
- Department
of Chemistry, TU Vienna, Getreidemarkt 9, 1060 Vienna, Austria
| | - Alexander K. Opitz
- Department
of Chemistry, TU Vienna, Getreidemarkt 9, 1060 Vienna, Austria
| | - Christoph Rameshan
- Department
of Chemistry, TU Vienna, Getreidemarkt 9, 1060 Vienna, Austria
| | - Raffael Rameshan
- Department
of Inorganic Chemistry, Fritz-Haber Institut
der MPG, Faradayweg 4, 14195 Berlin, Germany
- Department
of Physical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Raoul Blume
- Department
of Inorganic Chemistry, Fritz-Haber Institut
der MPG, Faradayweg 4, 14195 Berlin, Germany
| | - Michael Hävecker
- Department
of Inorganic Chemistry, Fritz-Haber Institut
der MPG, Faradayweg 4, 14195 Berlin, Germany
| | - Axel Knop-Gericke
- Department
of Inorganic Chemistry, Fritz-Haber Institut
der MPG, Faradayweg 4, 14195 Berlin, Germany
| | | | - Bernhard Klötzer
- Department
of Physical Chemistry, University of Innsbruck, Innrain 80-82, 6020 Innsbruck, Austria
| | - Jürgen Fleig
- Department
of Chemistry, TU Vienna, Getreidemarkt 9, 1060 Vienna, Austria
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36
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Zhang X, Ptasinska S. Heterogeneous Oxygen-Containing Species Formed via Oxygen or Water Dissociative Adsorption onto a Gallium Phosphide Surface. Top Catal 2015. [DOI: 10.1007/s11244-015-0526-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Yuan Z, Eden MR, Gani R. Toward the Development and Deployment of Large-Scale Carbon Dioxide Capture and Conversion Processes. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b03277] [Citation(s) in RCA: 157] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhihong Yuan
- Department
of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Mario R. Eden
- Department
of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Rafiqul Gani
- Department of Chemical and
Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs Lyngby, Denmark
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38
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Stoerzinger KA, Hong WT, Crumlin EJ, Bluhm H, Shao-Horn Y. Insights into electrochemical reactions from ambient pressure photoelectron spectroscopy. Acc Chem Res 2015; 48:2976-83. [PMID: 26305627 DOI: 10.1021/acs.accounts.5b00275] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The understanding of fundamental processes in the bulk and at the interfaces of electrochemical devices is a prerequisite for the development of new technologies with higher efficiency and improved performance. One energy storage scheme of great interest is splitting water to form hydrogen and oxygen gas and converting back to electrical energy by their subsequent recombination with only water as a byproduct. However, kinetic limitations to the rate of oxygen-based electrochemical reactions hamper the efficiency in technologies such as solar fuels, fuel cells, and electrolyzers. For these reactions, the use of metal oxides as electrocatalysts is prevalent due to their stability, low cost, and ability to store oxygen within the lattice. However, due to the inherently convoluted nature of electrochemical and chemical processes in electrochemical systems, it is difficult to isolate and study individual electrochemical processes in a complex system. Therefore, in situ characterization tools are required for observing related physical and chemical processes directly at the places where and while they occur and can help elucidate the mechanisms of charge separation and charge transfer at electrochemical interfaces. X-ray photoelectron spectroscopy (XPS), also known as ESCA (electron spectroscopy for chemical analysis), has been used as a quantitative spectroscopic technique that measures the elemental composition, as well as chemical and electronic state of a material. Building from extensive ex situ characterization of electrochemical systems, initial in situ studies were conducted at or near ultrahigh vacuum (UHV) conditions (≤10(-6) Torr) to probe solid-state electrochemical systems. However, through the integration of differential-pumping stages, XPS can now operate at pressures in the torr range, comprising a technique called ambient pressure XPS (AP-XPS). In this Account, we briefly review the working principles and current status of AP-XPS. We use several recent in situ studies on model electrochemical components as well as operando studies performed by our groups at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory to illustrate that AP-XPS is both a chemically and an electrically specific tool since photoelectrons carry information on both the local chemistry and electrical potentials. The applications of AP-XPS to oxygen electrocatalysis shown in this Account span well-defined studies of (1) the oxide/oxygen gas interface, (2) the oxide/water vapor interface, and (3) operando measurements of half and full electrochemical cells. Using specially designed model devices, we can expose and isolate the electrode or interface of interest to the incident X-ray beam and AP-XPS analyzer to relate the electrical potentials to the composition/chemical state of the key components and interfaces. We conclude with an outlook on new developments of AP-XPS end stations, which may provide significant improvement in the observation of dynamics over a wide range of time scales, higher spatial resolution, and improved characterization of boundary or interface layers (solid/solid and liquid/solid).
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Affiliation(s)
- Kelsey A. Stoerzinger
- Department of Materials Science & Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Advanced Light Source and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, California 94720, United States
| | - Wesley T. Hong
- Department of Materials Science & Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Advanced Light Source and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, California 94720, United States
| | - Ethan J. Crumlin
- Department of Materials Science & Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Advanced Light Source and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, California 94720, United States
| | - Hendrik Bluhm
- Department of Materials Science & Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Advanced Light Source and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, California 94720, United States
| | - Yang Shao-Horn
- Department of Materials Science & Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Advanced Light Source and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, California 94720, United States
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39
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Patel HC, Tabish AN, Aravind PV. Modelling of elementary kinetics of H2 and CO oxidation on ceria pattern cells. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.09.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Geller A, Pomfret M, Steinhurst DA, Yu Y, Liu Z, Owrutsky JC, Eichhorn BW. Operando Tracking of Electrochemical Activity in Solid Oxide Electrochemical Cells by using Near-Infrared Imaging. ChemElectroChem 2015. [DOI: 10.1002/celc.201500150] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Aaron Geller
- Department of Chemistry and Biochemistry; University of Maryland; College Park 20742 MD USA
| | - Michael Pomfret
- Chemistry Division; Naval Research Laboratory; Washington DC 20375 USA
| | | | - Yi Yu
- Department of Chemistry and Biochemistry; University of Maryland; College Park 20742 MD USA
| | - Zhi Liu
- Advanced Light Source; Lawrence Berkeley National Laboratory; Berkeley 94720 CA USA
| | | | - Bryan W. Eichhorn
- Department of Chemistry and Biochemistry; University of Maryland; College Park 20742 MD USA
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41
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Axnanda S, Crumlin EJ, Mao B, Rani S, Chang R, Karlsson PG, Edwards MOM, Lundqvist M, Moberg R, Ross P, Hussain Z, Liu Z. Using "Tender" X-ray Ambient Pressure X-Ray Photoelectron Spectroscopy as A Direct Probe of Solid-Liquid Interface. Sci Rep 2015; 5:9788. [PMID: 25950241 PMCID: PMC4650780 DOI: 10.1038/srep09788] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Accepted: 03/09/2015] [Indexed: 01/16/2023] Open
Abstract
We report a new method to probe the solid-liquid interface through the use of a thin liquid layer on a solid surface. An ambient pressure XPS (AP-XPS) endstation that is capable of detecting high kinetic energy photoelectrons (7 keV) at a pressure up to 110 Torr has been constructed and commissioned. Additionally, we have deployed a "dip &pull" method to create a stable nanometers-thick aqueous electrolyte on platinum working electrode surface. Combining the newly constructed AP-XPS system, "dip &pull" approach, with a "tender" X-ray synchrotron source (2 keV-7 keV), we are able to access the interface between liquid and solid dense phases with photoelectrons and directly probe important phenomena occurring at the narrow solid-liquid interface region in an electrochemical system. Using this approach, we have performed electrochemical oxidation of the Pt electrode at an oxygen evolution reaction (OER) potential. Under this potential, we observe the formation of both Pt(2+) and Pt(4+) interfacial species on the Pt working electrode in situ. We believe this thin-film approach and the use of "tender" AP-XPS highlighted in this study is an innovative new approach to probe this key solid-liquid interface region of electrochemistry.
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Affiliation(s)
- Stephanus Axnanda
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States
| | - Ethan J Crumlin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States
| | - Baohua Mao
- 1] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States [2] State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China
| | - Sana Rani
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States
| | - Rui Chang
- 1] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States [2] State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China
| | | | | | | | | | - Phil Ross
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States
| | - Zahid Hussain
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States
| | - Zhi Liu
- 1] Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States [2] State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China [3] School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
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42
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Opitz AK, Nenning A, Rameshan C, Rameshan R, Blume R, Hävecker M, Knop-Gericke A, Rupprechter G, Fleig J, Klötzer B. Enhancing electrochemical water-splitting kinetics by polarization-driven formation of near-surface iron(0): an in situ XPS study on perovskite-type electrodes. Angew Chem Int Ed Engl 2015; 54:2628-32. [PMID: 25557533 PMCID: PMC4506551 DOI: 10.1002/anie.201409527] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Indexed: 11/12/2022]
Abstract
In the search for optimized cathode materials for high-temperature electrolysis, mixed conducting oxides are highly promising candidates. This study deals with fundamentally novel insights into the relation between surface chemistry and electrocatalytic activity of lanthanum ferrite based electrolysis cathodes. For this means, near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) and impedance spectroscopy experiments were performed simultaneously on electrochemically polarized La0.6 Sr0.4 FeO3-δ (LSF) thin film electrodes. Under cathodic polarization the formation of Fe(0) on the LSF surface could be observed, which was accompanied by a strong improvement of the electrochemical water splitting activity of the electrodes. This correlation suggests a fundamentally different water splitting mechanism in presence of the metallic iron species and may open novel paths in the search for electrodes with increased water splitting activity.
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Affiliation(s)
- Alexander K Opitz
- Vienna University of Technology, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC, 1060 Vienna (Austria).
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43
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Kato S, Ammann M, Huthwelker T, Paun C, Lampimäki M, Lee MT, Rothensteiner M, van Bokhoven JA. Quantitative depth profiling of Ce3+ in Pt/CeO2 by in situ high-energy XPS in a hydrogen atmosphere. Phys Chem Chem Phys 2015; 17:5078-83. [DOI: 10.1039/c4cp05643d] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Where is the Ce3+? Depth-profiling by in situ high-energy XPS provides an answer.
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Affiliation(s)
- Shunsuke Kato
- Laboratory of Radio- and Environmental Chemistry
- Paul Scherrer Institute
- Switzerland
| | - Markus Ammann
- Laboratory of Radio- and Environmental Chemistry
- Paul Scherrer Institute
- Switzerland
| | - Thomas Huthwelker
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- Switzerland
| | - Cristina Paun
- Institute for Chemical and Bioengineering
- ETH Zürich
- Switzerland
| | - Markus Lampimäki
- Laboratory of Radio- and Environmental Chemistry
- Paul Scherrer Institute
- Switzerland
| | - Ming-Tao Lee
- Laboratory of Radio- and Environmental Chemistry
- Paul Scherrer Institute
- Switzerland
| | - Matthäus Rothensteiner
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- Switzerland
- Institute for Chemical and Bioengineering
- ETH Zürich
| | - Jeroen A. van Bokhoven
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- Switzerland
- Institute for Chemical and Bioengineering
- ETH Zürich
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44
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Feng ZA, Machala ML, Chueh WC. Surface electrochemistry of CO2reduction and CO oxidation on Sm-doped CeO2−x: coupling between Ce3+and carbonate adsorbates. Phys Chem Chem Phys 2015; 17:12273-81. [DOI: 10.1039/c5cp00114e] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Strong coupling between carbonate coverage, surface Ce3+concentration and overpotential reveals rate-limiting step in CO oxidation and CO2reduction.
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Affiliation(s)
- Zhuoluo A. Feng
- Department of Applied Physics
- Stanford University
- Stanford
- USA
- Stanford Institute for Materials and Energy Sciences
| | - Michael L. Machala
- Department of Materials Science and Engineering
- Stanford University
- Stanford, CA 94305
- USA
| | - William C. Chueh
- Stanford Institute for Materials and Energy Sciences
- SLAC National Accelerator Laboratory
- Menlo Park
- USA
- Department of Materials Science and Engineering
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45
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Sun LB, Liu XQ, Zhou HC. Design and fabrication of mesoporous heterogeneous basic catalysts. Chem Soc Rev 2015; 44:5092-147. [DOI: 10.1039/c5cs00090d] [Citation(s) in RCA: 287] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Recent advances in mesoporous solid bases were reviewed, and fundamental principles of how to fabricate efficient basic catalysts were highlighted.
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Affiliation(s)
- Lin-Bing Sun
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xiao-Qin Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Hong-Cai Zhou
- Department of Chemistry
- Texas A&M University
- College Station
- USA
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46
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Efficient Carbon Dioxide Electrolysis Based on Perovskite Cathode Enhanced with Nickel Nanocatalyst. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.11.151] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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47
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Opitz AK, Nenning A, Rameshan C, Rameshan R, Blume R, Hävecker M, Knop-Gericke A, Rupprechter G, Fleig J, Klötzer B. Enhancing Electrochemical Water-Splitting Kinetics by Polarization-Driven Formation of Near-Surface Iron(0): An In Situ XPS Study on Perovskite-Type Electrodes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409527] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Liu X, Yang W, Liu Z. Recent progress on synchrotron-based in-situ soft X-ray spectroscopy for energy materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7710-29. [PMID: 24799004 DOI: 10.1002/adma.201304676] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 01/22/2014] [Indexed: 05/22/2023]
Abstract
Soft X-ray spectroscopy (SXS) techniques such as photoelectron spectroscopy, soft X-ray absorption spectroscopy and X-ray emission spectroscopy are efficient and direct tools to probe electronic structures of materials. Traditionally, these surface sensitive soft X-ray techniques that detect electrons or photons require high vacuum to operate. Many recent in situ instrument developments of these techniques have overcome this vacuum barrier. One can now study many materials and model devices under near ambient, semi-realistic, and operando conditions. Further developments of integrating the realistic sample environments with efficient and high resolution detection methods, particularly at the high brightness synchrotron light sources, are making SXS an important tool for the energy research community. In this progress report, we briefly describe the basic concept of several SXS techniques and discuss recent development of SXS instruments. We then present several recent studies, mostly in situ SXS experiments, on energy materials and devices. Using these studies, we would like to highlight that the integration of SXS and in situ environments can provide in-depth insight of material's functionality and help researchers in new energy material developments. The remaining challenges and critical research directions are discussed at the end.
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Affiliation(s)
- Xiaosong Liu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China; Advanced Light Source Division, Lawrence Berkley National Laboratory, Berkeley, CA, 94720, USA
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49
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Nenning A, Opitz AK, Huber TM, Fleig J. A novel approach for analyzing electrochemical properties of mixed conducting solid oxide fuel cell anode materials by impedance spectroscopy. Phys Chem Chem Phys 2014; 16:22321-36. [PMID: 25219525 DOI: 10.1039/c4cp02467b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For application of acceptor-doped mixed conducting oxides as solid oxide fuel cell (SOFC) anodes, high electrochemical surface activity as well as acceptable electronic and ionic conductivity are crucial. In a reducing atmosphere, particularly the electronic conductivity of acceptor-doped oxides can become rather low and the resulting complex interplay of electrochemical reactions and charge transport processes makes a mechanistic interpretation of impedance measurements very complicated. In order to determine all relevant resistive and capacitive contributions of mixed conducting electrodes in a reducing atmosphere, a novel electrode design and impedance-based analysis technique is therefore introduced. Two interdigitating metallic current collectors are placed in a microelectrode, which allows in-plane measurements within the electrode as well as electrochemical measurements versus a counter electrode. Equivalent circuit models for quantifying the spectra of both measurement modes are developed and applied to simultaneously fit both spectra, using the same parameter set. In this manner, the electronic and ionic conductivity of the material as well as the area-specific resistance of the surface reaction and the chemical capacitance can be determined on a single microelectrode in a H2-H2O atmosphere. The applicability of this new tool was demonstrated in SrTi0.7Fe0.3O(3-δ) (STFO) thin film microelectrodes, deposited on single-crystalline yttria-stabilized zirconia (YSZ) substrates. All materials parameters that contribute to the polarization resistance of STFO electrodes in a reducing atmosphere could thus be quantified.
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Affiliation(s)
- A Nenning
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria.
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50
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Qiu N, Zhang J, Wu Z. Peculiar surface–interface properties of nanocrystalline ceria–cobalt oxides with enhanced oxygen storage capacity. Phys Chem Chem Phys 2014; 16:22659-64. [DOI: 10.1039/c4cp03390f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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