101
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La0.6Sr0.4Co0.2Fe0.79M0.01O3−δ (M = Ni, Pd) perovskites synthesized by Citrate-EDTA method: Oxygen vacancies effect on electrochemical properties. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.07.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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102
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Yang T, Matthews AH, Xu N, Chen Y, An K, Ma D, Huang K. Understanding Structure-Activity Relationships in Sr 1- xY xCoO 3-δ through in Situ Neutron Diffraction and Electrochemical Measurements. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35984-35993. [PMID: 30251821 DOI: 10.1021/acsami.8b12943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this work, we report a systematic study on temperature-dependent local structural evolution, oxygen stoichiometry, and electrochemical properties of an oxygen-deficient perovskite Sr0.7Y0.3CoO3-δ (SYC30) for oxygen electrocatalysis. The obtained results are then closely compared with its analogue Sr0.9Y0.1CoO3-δ (SYC10) of different crystal structures to establish structure-activity relationships. The comparison shows that both SYC30 and SYC10 consist of alternate layers of oxygen-deficient Co1-polyhedra and oxygen-saturated Co2-octahedra with Co1-polyhedra being responsible for Vo•• migration. It is also found that the distribution and concentration of oxygen vacancies within the Co1-layer are, respectively, less symmetrical and lower in SYC30 than those in SYC10, making the former unfavorable for oxygen transport. A molecular orbital energy analysis reveals that the energy gap between Fermi level and O 2p level in the active Co1-polyhedra is larger in SYC30 than that in SYC10, further suggesting that SYC10 is a better oxide-ion conductor and thus a better electrocatalyst for oxygen reduction reaction, which is unambiguously confirmed by the subsequent electrochemical measurements.
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Affiliation(s)
- Tianrang Yang
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Allison H Matthews
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Nansheng Xu
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Yan Chen
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Ke An
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Dong Ma
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Kevin Huang
- Department of Mechanical Engineering , University of South Carolina , Columbia , South Carolina 29208 , United States
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103
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Rupp GM, Kubicek M, Opitz AK, Fleig J. In Situ Impedance Analysis of Oxygen Exchange on Growing La 0.6Sr 0.4CoO 3-δ Thin Films. ACS APPLIED ENERGY MATERIALS 2018; 1:4522-4535. [PMID: 30272051 PMCID: PMC6158676 DOI: 10.1021/acsaem.8b00586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 08/20/2018] [Indexed: 06/08/2023]
Abstract
The further development of solid oxide fuel and electrolysis cells (SOFC/SOEC) strongly relies on research activities dealing with electrode materials. Recent studies showed that under operating conditions many perovskite-type oxide electrodes are prone to changes of their surface composition, leading to severe changes of their electrochemical performance. This results in a large scatter of data in literature and complicates comparison of materials. Moreover, little information is available on the potentially excellent properties of surfaces immediately after preparation, that is, before any degradation by exposure to other gas compositions or temperature changes. Here, we introduce in situ impedance spectroscopy during pulsed laser deposition (IPLD) as a new method for electrochemical analysis of mixed ionic and electronic conducting (MIEC) thin films during growth. First, this approach can truly reveal the properties of as-prepared MIEC electrode materials, since it avoids any alterations of their surface between preparation and investigation. Second, the measurements during growth give information on the thickness dependence of film properties. This technique is applied to La0.6Sr0.4CoO3-δ (LSC), one of the most promising SOFC/SOEC oxygen electrode material. From the earliest stages of LSC film deposition on yttria-stabilized zirconia (YSZ) to a fully grown thin film of 100 nm thickness, data are gained on the oxygen exchange kinetics and the defect chemistry of LSC. A remarkable reproducibility is found in repeated film growth experiments, not only for the bulk related chemical capacitance but also for the surface related polarization resistance (±10%). Polarization resistances of as-prepared LSC films are extraordinarily low (2.0 Ω cm2 in 40 μbar O2 at 600 °C). LSC films on YSZ and on La0.95Sr0.05Ga0.95Mg0.05O3-δ (LSGM) single crystals exhibit significantly different electrochemical properties, possibly associated with the tensile strain of LSC on LSGM.
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104
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Kısa AE, Demircan O. Transition Metal Doped Solid Oxide Fuel Cell Cathodes. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2018. [DOI: 10.18596/jotcsa.424226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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105
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Huang YL, Hussain AM, Robinson IA, Wachsman ED. Nanointegrated, High-Performing Cobalt-Free Bismuth-Based Composite Cathode for Low-Temperature Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2018; 10:28635-28643. [PMID: 30070825 DOI: 10.1021/acsami.8b08911] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Cost-effective cathodes that actively catalyze the oxygen reduction reaction (ORR) are one of the major challenges for the technological advancement of low-temperature solid oxide fuel cells (LT-SOFCs). In particular, cobalt has been an essential element in electrocatalysts for efficiently catalyzing the ORR; nevertheless, the cost, safety, and stability issues of cobalt in cathode materials remain a severe drawback for SOFC development. Here, we demonstrated that by appropriate nanoengineering, we can overcome the inherent electrocatalytic advantages of cobalt-based cathodes to achieve comparable performance with a cobalt-free electrocatalyst on a bismuth-based fast oxygen ion-conducting scaffold that simultaneously enhances the performance and stability of LT-SOFCs. Consequently, the peak power density of the SOFCs reaches 1.2 W/cm2 at 600 °C, highest performance of a cobalt-free-based cathode that has been ever reported. In addition, by the surface-protecting effect of covered nanoelectrocatalysts, the evaporation of highly volatile bismuth is greatly suppressed, resulting in an 80% improvement in performance durability, the best among all reported bismuth-based fuel cells.
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Affiliation(s)
- Yi-Lin Huang
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering , University of Maryland , College Park , Maryland 20742 , United States
| | - A Mohammed Hussain
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering , University of Maryland , College Park , Maryland 20742 , United States
| | - Ian A Robinson
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering , University of Maryland , College Park , Maryland 20742 , United States
| | - Eric D Wachsman
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering , University of Maryland , College Park , Maryland 20742 , United States
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106
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Park BK, Lee SB, Lim TH, Song RH, Lee JW. High-Performance Solid Oxide Fuel Cell with an Electrochemically Surface-Tailored Oxygen Electrode. CHEMSUSCHEM 2018; 11:2620-2627. [PMID: 29808966 DOI: 10.1002/cssc.201800962] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 05/27/2018] [Indexed: 06/08/2023]
Abstract
State-of-the-art cathodes for solid oxide fuel cells (SOFCs), such as (La,Sr)MnO3 -(Y2 O3 )0.08 (ZrO2 )0.92 (LSM-YSZ), suffer from sluggish oxygen reduction reaction (ORR) kinetics at reduced temperatures, leading to a significant decline in their performance. Herein, we report a tailored SOFC cathode with high ORR activity at intermediate temperatures using a simple but effective approach based on "electrochemical" surface modification. The proposed process involves chemically assisted electrodeposition (CAED) of a metal hydroxide (LaCo(OH)x ) on LSM-YSZ surfaces followed by in situ thermal conversion of LaCo(OH)x to perovskite-type LaCoO3 (LCO) nanoparticles during the SOFC startup. This method facilitates easy loading of the LCO nanoparticles with a precisely controlled morphology without the need for repeated deposition/annealing processes. An anode-supported SOFC with the LCO-tailored LSM-YSZ electrode exhibits a remarkably increased power density, approximately 180 % at 700 °C, compared with an SOFC with the pristine electrode as well as excellent long-term stability, which are attributed to the beneficial role of the CAED-derived LCO nanoparticles in enlarging the active areas for ORR and promoting oxygen adsorption/diffusion. This work demonstrates that controlled surface tailoring of the cathode by CAED could be an effective approach for improving the performance of SOFCs at reduced temperatures.
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Affiliation(s)
- Beom-Kyeong Park
- Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Seung-Bok Lee
- Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Tak-Hyoung Lim
- Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Rak-Hyun Song
- Fuel Cell Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
| | - Jong-Won Lee
- Department of Materials Science and Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju, 61452, Republic of Korea
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107
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Mosiałek M, Michna A, Dziubaniuk M, Bielańska E, Kežionis A, Šalkus T, Kazakevičius E, Bożek B, Krawczyk A, Wyrwa J, Orliukas AF. Composite cathode material LSCF-Ag for solid oxide fuel cells obtained in one step sintering procedure. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.06.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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108
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Wang X, Han Y, Song X, Liu W, Jin Y, Liu W, Cui H. An insight into the effects of transition metals on the thermal expansion of complex perovskite compounds: an experimental and density functional theory investigation. Phys Chem Chem Phys 2018; 20:17781-17789. [PMID: 29922781 DOI: 10.1039/c8cp02451k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABO3 perovskite-type LaCoO3, LaCo0.5Fe0.5O3, LaCo0.5Ni0.5O3, and LaCo0.5Mn0.5O3 complex oxides were synthesized using the sol-gel method. The microstructure and the thermal expansion behavior of the oxides were investigated. Insights into phonon dispersion and the effects of doped transition metals on thermal expansion were obtained by first-principles calculations based on density functional theory. Thermal expansion coefficients (TECs) at finite temperatures were obtained by quasi harmonic approximation. B-site doping was found to reduce the size of the crystalline grains and the TECs of perovskite compounds. The average TECs of LaCoO3, LaCo0.5Fe0.5O3, LaCo0.5Ni0.5O3, and LaCo0.5Mn0.5O3 were 25 × 10-6 K-1, 11 × 10-6 K-1, 12.5 × 10-6 K-1, and 5 × 10-6 K-1, respectively, in the 0-1000 K temperature range. In addition, the TECs of LaCo0.5Fe0.5O3 and LaCo0.5Ni0.5O3 matched well with those of some common electrolytes.
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Affiliation(s)
- Xiao Wang
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, People's Republic of China
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109
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Schmid A, Rupp GM, Fleig J. How To Get Mechanistic Information from Partial Pressure-Dependent Current-Voltage Measurements of Oxygen Exchange on Mixed Conducting Electrodes. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2018; 30:4242-4252. [PMID: 30100672 PMCID: PMC6083415 DOI: 10.1021/acs.chemmater.8b00597] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 06/04/2018] [Indexed: 06/08/2023]
Abstract
The oxygen incorporation and evolution reaction on mixed conducting electrodes of solid oxide fuel or electrolysis cells involves gas molecules as well as ionic and electronic point defects in the electrode. The defect concentrations depend on the gas phase and can be modified by the overpotential. These interrelationships make a mechanistic analysis of partial pressure-dependent current-voltage experiments challenging. In this contribution it is described how to exploit this complex situation to unravel the kinetic roles of surface adsorbates and electrode point defects. Essential is a counterbalancing of oxygen partial pressure and dc electrode polarization such that the point defect concentrations in the electrode remain constant despite varying the oxygen partial pressure. It is exemplarily shown for La0.6Sr0.4FeO3-δ (LSF) thin film electrodes on yttria-stabilized zirconia how mechanistically relevant reaction orders can be obtained from current-voltage curves, measured in a three-electrode setup. This analysis strongly suggests electron holes as the limiting defect species for the oxygen evolution on LSF and reveals the dependence of the oxygen incorporation rate on the oxygen vacancy concentration. A virtual independence of the reaction rate from the oxygen partial pressure was empirically found for moderate oxygen pressures. This effect, however, arises from a counterbalancing of defect and adsorbate concentration changes.
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110
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Rednyk A, Mori T, Yamamoto S, Suzuki A, Yamamoto Y, Tanji T, Isaka N, Kúš P, Ito S, Ye F. Design of Active Sites on Nickel in the Anode of Intermediate-Temperature Solid Oxide Fuel Cells using Trace Amount of Platinum Oxides. Chempluschem 2018; 83:756-768. [PMID: 31950667 DOI: 10.1002/cplu.201800170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/10/2018] [Indexed: 11/12/2022]
Abstract
In recent years, the lowering of the operation temperature of solid oxide fuel cells (SOFCs) has attracted much attention owing to the trade-off between the best performance and the life span of SOFCs. For this challenge, new active sites on the Ni surfaces in a Nickel-Yttria-Stabilized Zirconia (Ni-YSZ) cermet anode of SOFCs have been created by deposition of trace amounts of platinum oxide (PtOx ) followed by an activation step of the anode at 1073 K in a hydrogen flow. The internal resistance (IR) free value (185 mA cm-2 at 0.8 V) observed for the single cell with an anode sputtered with a trace amount of PtOx (Pt content in anode: from 9 to 91 ppm) at 973 K is conspicuously higher than that of a similar single cell with a nonsputtered cermet anode (85 mA cm-2 ) at 0.8 V and 1073 K. Transmission electron microscopy microanalysis shows that the defect structure is formed on a partially oxidized Ni surface by active Pt species. Also, surface atomistic simulation on NiO (111) predicts the formation of Frenkel defect clusters with Pt cations, which partially cover the Ni surface. The formation of Frenkel defect clusters on the partially oxidized Ni surface (i.e., creation of new active sites for formation of water molecules) promotes the anode reaction, resulting in improvements in the anode performance of SOFC single cells at 973 K. Design of the aforementioned new active sites on Ni through sputtering of trace amounts of PtOx provides a great opportunity for "radical innovation" in the design of intermediate-temperature SOFCs.
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Affiliation(s)
- Andrii Rednyk
- Global Research Center for Environmental and Energy Based on Nanomaterials (GREEN), Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki, 305-0044, Japan
| | - Toshiyuki Mori
- Global Research Center for Environmental and Energy Based on Nanomaterials (GREEN), Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki, 305-0044, Japan
| | - Shunya Yamamoto
- Takasaki Advanced Radiation Research Institute, National Institute for Quantum and Radiological Science and Technology (QST), 1233 Watanuki Takasaki, Gunma, 370-1292, Japan
| | - Akira Suzuki
- Global Research Center for Environmental and Energy Based on Nanomaterials (GREEN), Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki, 305-0044, Japan
| | - Yuta Yamamoto
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Takayoshi Tanji
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Noriko Isaka
- Transmission Electron Microscopy (TEM) station, National Institute for Materials Science (NIMS), 1-2-1 Sengen Tsukuba, Ibaraki, 305-0047, Japan
| | - Peter Kúš
- Global Research Center for Environmental and Energy Based on Nanomaterials (GREEN), Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki, 305-0044, Japan.,Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00, Prague 8, Czech Republic
| | - Shigeharu Ito
- Global Research Center for Environmental and Energy Based on Nanomaterials (GREEN), Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba, Ibaraki, 305-0044, Japan.,Department of Creative Engineering, Chemical and Biological course, National Institute of Technology, Tsuruoka College, 104 Sawada, Inooka, Tsuruoka, Yamagata, 997-8511, Japan
| | - Fei Ye
- School of Material Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P. R. China
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111
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Arivukkarasu KR, Venkatesh S, Karthikeyan N, Vishista K. Preparation and characterisation of pure and neodymium doped samarium strontium cobaltites. ACTA ACUST UNITED AC 2018. [DOI: 10.1080/14328917.2018.1471180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
| | - S. Venkatesh
- Department of Physics, Anna University, Chennai, India
| | | | - K. Vishista
- Department of Physics, Anna University, Chennai, India
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112
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Andersen TK, Cook S, Benda E, Hong H, Marks LD, Fong DD. Development of a hybrid molecular beam epitaxy deposition system for in situ surface x-ray studies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:033905. [PMID: 29604768 DOI: 10.1063/1.5008369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A portable metalorganic gas delivery system designed and constructed to interface with an existing molecular beam epitaxy chamber at beamline 33-ID-E of the Advanced Photon Source is described. This system offers the ability to perform in situ X-ray measurements of complex oxide growth via hybrid molecular beam epitaxy. The performance of the hybrid molecular beam epitaxy system while delivering metalorganic source materials is described. The high-energy X-ray scattering capabilities of the hybrid molecular beam epitaxy system are demonstrated both on oxide films grown solely from the metalorganic source and ABO3 oxide perovskites containing elements from both the metalorganic source and a traditional effusion cell.
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Affiliation(s)
- Tassie K Andersen
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | - Seyoung Cook
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | - Erika Benda
- Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | - Hawoong Hong
- Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | - Laurence D Marks
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Dr., Evanston, Illinois 60208, USA
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
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113
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114
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Andersen TK, Cook S, Wan G, Hong H, Marks LD, Fong DD. Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5949-5958. [PMID: 29346722 DOI: 10.1021/acsami.7b16970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Control over structure and composition of (ABO3) perovskite oxides offers exciting opportunities since these materials possess unique, tunable properties. Perovskite oxides with cobalt B-site cations are particularly promising, as the range of the cation's stable oxidation states leads to many possible structural frameworks. Here, we report growth of strontium cobalt oxide thin films by molecular beam epitaxy, and conditions necessary to stabilize different defect concentration phases. In situ X-ray scattering is used to monitor structural evolution during growth, while in situ X-ray absorption near-edge spectroscopy is used to probe oxidation state and measure changes to oxygen vacancy concentration as a function of film thickness. Experimental results are compared to kinetically limited thermodynamic predictions, in particular, solute trapping, with semiquantitative agreement. Agreement between observations of dependence of cobaltite phase on oxidation activity and deposition rate, and predictions indicates that a combined experimental/theoretical approach is key to understanding phase behavior in the strontium cobalt oxide system.
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Affiliation(s)
- Tassie K Andersen
- Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Seyoung Cook
- Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Gang Wan
- Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Hawoong Hong
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Laurence D Marks
- Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
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115
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Das S, Mondal P, Ghosh S, Satpati B, Deka S, Islam SM, Bala T. A facile synthesis strategy to couple porous nanocubes of CeO2 with Ag nanoparticles: an excellent catalyst with enhanced reactivity for the ‘click reaction’ and carboxylation of terminal alkynes. NEW J CHEM 2018. [DOI: 10.1039/c8nj00665b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CeO2–Ag nanocomposite was synthesized by modifying the surface of CeO2 with DMP and its catalytic activity was shown for click reaction and carboxylation of terminal alkynes.
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Affiliation(s)
- Subhasis Das
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | | | | | - Biswarup Satpati
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- HBNI
- Kolkata-700064
- India
| | - Sasanka Deka
- Department of Chemistry
- University of Delhi
- Delhi-110007
- India
| | | | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
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116
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Inoue R, Fujii K, Shiraiwa M, Niwa E, Yashima M. A new structure family of oxide-ion conductors Ca0.8Y2.4Sn0.8O6 discovered by a combined technique of the bond-valence method and experiments. Dalton Trans 2018; 47:7515-7521. [DOI: 10.1039/c8dt01024b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mg3TeO6-type Ca0.8Y2.4Sn0.8O6 was found as a new structure family of oxide-ion conductors by BVE calculations followed by experiments.
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Affiliation(s)
- Ryota Inoue
- Department of Chemistry
- School of Science
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Kotaro Fujii
- Department of Chemistry
- School of Science
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Masahiro Shiraiwa
- Department of Chemistry
- School of Science
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Eiki Niwa
- Department of Chemistry
- School of Science
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Masatomo Yashima
- Department of Chemistry
- School of Science
- Tokyo Institute of Technology
- Tokyo
- Japan
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117
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Du Z, Zhang Z, Niemczyk A, Olszewska A, Chen N, Świerczek K, Zhao H. Unveiling the effects of A-site substitutions on the oxygen ion migration in A2−xA′xNiO4+δ by first principles calculations. Phys Chem Chem Phys 2018; 20:21685-21692. [DOI: 10.1039/c8cp04392b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First principles calculations unveil the effects of A-site substitutions on the interstitial oxygen formation and migration energy in A2−xA′xNiO4+δ.
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Affiliation(s)
- Zhihong Du
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- AGH University of Science and Technology
| | - Zijia Zhang
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- AGH University of Science and Technology
| | - Anna Niemczyk
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
| | - Anna Olszewska
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
| | - Ning Chen
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- Beijing Municiple Key Lab for Advanced Energy Materials and Technologies
| | - Konrad Świerczek
- AGH University of Science and Technology
- Faculty of Energy and Fuels
- 30-059 Krakow
- Poland
- AGH Centre of Energy
| | - Hailei Zhao
- University of Science and Technology Beijing
- School of Materials Science and Engineering
- Beijing 100083
- China
- Beijing Municiple Key Lab for Advanced Energy Materials and Technologies
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118
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Opitz AK, Rameshan C, Kubicek M, Rupp GM, Nenning A, Götsch T, Blume R, Hävecker M, Knop-Gericke A, Rupprechter G, Klötzer B, Fleig J. The Chemical Evolution of the La 0.6Sr 0.4CoO 3-δ Surface Under SOFC Operating Conditions and Its Implications for Electrochemical Oxygen Exchange Activity. Top Catal 2018; 61:2129-2141. [PMID: 30930590 PMCID: PMC6404788 DOI: 10.1007/s11244-018-1068-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Owing to its extraordinary high activity for catalysing the oxygen exchange reaction, strontium doped LaCoO3 (LSC) is one of the most promising materials for solid oxide fuel cell (SOFC) cathodes. However, under SOFC operating conditions this material suffers from performance degradation. This loss of electrochemical activity has been extensively studied in the past and an accumulation of strontium at the LSC surface has been shown to be responsible for most of the degradation effects. The present study sheds further light onto LSC surface changes also occurring under SOFC operating conditions. In-situ near ambient pressure X-ray photoelectron spectroscopy measurements were conducted at temperatures between 400 and 790 °C. Simultaneously, electrochemical impedance measurements were performed to characterise the catalytic activity of the LSC electrode surface for O2 reduction. This combination allowed a correlation of the loss in electro-catalytic activity with the appearance of an additional La-containing Sr-oxide species at the LSC surface. This additional Sr-oxide species preferentially covers electrochemically active Co sites at the surface, and thus very effectively decreases the oxygen exchange performance of LSC. Formation of precipitates, in contrast, was found to play a less important role for the electrochemical degradation of LSC.
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Affiliation(s)
- Alexander K Opitz
- 1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Christoph Rameshan
- 2Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165-PC, 1060 Vienna, Austria
| | - Markus Kubicek
- 1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Ghislain M Rupp
- 1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
| | - Andreas Nenning
- 1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria.,6Present Address: Department of Materials Science and Engineering, MIT, 77 Massachusetts Avenue, 02139 Cambridge, MA USA
| | - Thomas Götsch
- 3Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria
| | - Raoul Blume
- 4Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Michael Hävecker
- 4Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Axel Knop-Gericke
- 4Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany.,5Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45413 Mülheim, Germany
| | - Günther Rupprechter
- 2Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165-PC, 1060 Vienna, Austria
| | - Bernhard Klötzer
- 3Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria
| | - Jürgen Fleig
- 1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164-EC, 1060 Vienna, Austria
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119
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Galin MZ, Ivanov-Schitz AK, Mazo GN. Molecular Dynamics Simulation of the Structure and Ion Transport in the Ce1 – xGd x O2 – δ|YSZ Heterosystem. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518010078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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120
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Das S, Bhattacharjee G, Satpati B, Kumar M, Deka S, Ghosalya MK, S. Gopinath C, Bala T. Deposition of Au nanoparticles inside porous CeO2 nanocubes using Langmuir–Blodgett technique. NEW J CHEM 2018. [DOI: 10.1039/c7nj03948d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
AuCl4-ions are reduced to Au0 inside the pores of CeO2 nanocubes by oleylamine, which has the dual role of capping and reducing agent.
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Affiliation(s)
- Subhasis Das
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | - Gourab Bhattacharjee
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- HBNI
- Kolkata-700064
- India
| | - Biswarup Satpati
- Surface Physics and Material Science Division
- Saha Institute of Nuclear Physics
- HBNI
- Kolkata-700064
- India
| | - Mukesh Kumar
- Department of Chemistry
- University of Delhi
- Delhi-110007
- India
| | - Sasanka Deka
- Department of Chemistry
- University of Delhi
- Delhi-110007
- India
| | - Manoj Kumar Ghosalya
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008
- India
| | - Chinnakonda S. Gopinath
- Catalysis Division and Center of Excellence on Surface Science
- CSIR – National Chemical Laboratory
- Pune-411 008
- India
| | - Tanushree Bala
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
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121
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Pavlovska OB, Vasylechko LO, Lutsyuk IV, Koval NM, Zhydachevskii YA, Pieniążek A. Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La 1-x Sm x FeO 3. NANOSCALE RESEARCH LETTERS 2017; 12:153. [PMID: 28249371 PMCID: PMC5328888 DOI: 10.1186/s11671-017-1946-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 02/22/2017] [Indexed: 06/06/2023]
Abstract
Micro- and nanocrystalline lanthanum-samarium ferrites La1-x Sm x FeO3 with orthorhombic perovskite structure were obtained by using both solid state reactions (x = 0.2, 0.4, 0.6 and 0.8) and sol-gel synthesis (x = 0.5) techniques. Obtained structural parameters of both series of La1-x Sm x FeO3 are in excellent agreement with the "pure" LaFeO3 and SmFeO3 compounds, thus proving formation of continuous solid solution in the LaFeO3-SmFeO3 system. Peculiarity of La1-x Sm x FeO3 solid solution is divergence behaviour of unit cell dimensions with increasing x: systematic decrease of the a and c lattice parameters is accompanied with increasing b parameter. Such behaviour of the unit cell dimensions in La1-x Sm x FeO3 series led to crossover of the a and c perovskite lattice parameters and formation of dimensionally tetragonal structure near x = 0.04. Linear decrease of the unit cell volume of La1-x Sm x FeO3 with decreasing x according with the Vegard's rule indicate absence of short-range ordering of R-cations in the LaFeO3-SmFeO3 system.
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Affiliation(s)
- O. B. Pavlovska
- Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
| | - L. O. Vasylechko
- Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
| | - I. V. Lutsyuk
- Department of Chemical Technology of Silicates of Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
| | - N. M. Koval
- Department of Ecological Safety and Nature Protection Activity of Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
| | - Ya A. Zhydachevskii
- Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013 Lviv, Ukraine
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
| | - A. Pieniążek
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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122
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Han GD, Choi HJ, Bae K, Choi HR, Jang DY, Shim JH. Fabrication of Lanthanum Strontium Cobalt Ferrite-Gadolinium-Doped Ceria Composite Cathodes Using a Low-Price Inkjet Printer. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39347-39356. [PMID: 29039185 DOI: 10.1021/acsami.7b11462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this work, we have successfully fabricated lanthanum strontium cobalt ferrite (LSCF)-gadolinium-doped ceria (GDC) composite cathodes by inkjet printing and demonstrated their functioning in solid oxide fuel cells (SOFCs). The cathodes are printed using a low-cost HP inkjet printer, and the LSCF and GDC source inks are synthesized with fluidic properties optimum for inkjet printing. The composition and microstructure of the LSCF and GDC layers are successfully controlled by controlling the color level in the printed images and the number of printing cycles, respectively. Anode-support type SOFCs with optimized LSCF-GDC composite cathodes synthesized by our inkjet printing method have achieved a power output of over 570 mW cm-2 at 650 °C, which is comparable to the performance of a commercial SOFC stack. Electrochemical impedance analysis is carried out to establish a relationship between the cell performance and the compositional and structural characteristics of the printed LSCF-GDC composite cathodes.
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Affiliation(s)
- Gwon Deok Han
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
| | - Hyung Jong Choi
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
| | - Kiho Bae
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
- High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology (KIST) , 14-5 Hwarang-ro, Seongbuk-gu, Seoul 02792, South Korea
| | - Hyeon Rak Choi
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
| | - Dong Young Jang
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
| | - Joon Hyung Shim
- School of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea
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123
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Yang T, Wang J, Chen Y, An K, Ma D, Vogt T, Huang K. A Combined Variable-Temperature Neutron Diffraction and Thermogravimetric Analysis Study on a Promising Oxygen Electrode, SrCo 0.9Nb 0.1O 3-δ, for Reversible Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:34855-34864. [PMID: 28885009 DOI: 10.1021/acsami.7b08697] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The present study investigates the temperature-structure-stoichiometry relationship of a promising oxygen electrode SrCo0.9Nb0.1O3-δ over a temperature (T) range from room temperature (RT) to 900 °C. The techniques employed are variable-temperature neutron diffraction (VTND) and thermogravimetric analysis (TGA). At T < 75 °C, VTND reveals a tetragonal (P4/mmm) structure with a G-type magnetic ordering. Above 75 °C, the nucleus structure remains the same, while the magnetic ordering disappears. A phase transition from tetragonal (P4/mmm) to cubic (Pm3̅m) is observed at 412 °C, where the two Co sites and three O sites in the P4/mmm phase converge to one equivalent site, respectively. The phase transition temperature coincides with the peak temperature of oxygen uptake obtained by TGA. It is also observed that the Nb dopant has no preferred Co site to occupy. The oxygen vacancies are mostly located at the O3 site surrounding the Co2 site in the P4/mmm structure. The intermediate-spin state of Co3+ at the Co2 site is responsible for the observed distortions of CoO6 octahedra, i.e., elongation of Co2O6 octahedra and shortening of Co1O6 octahedra along the c-axis, which is a phenomenon known as Jahn-Teller distortion. At high temperatures, large thermal displacement factor for O2- is observed with high concentration of oxygen vacancies, providing a structural environment favorable to high O2- conductivity in Nb-doped SrCoO3-based oxygen electrode materials.
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Affiliation(s)
- Tianrang Yang
- Department of Mechanical Engineering, University of South Carolina , Columbia, South Carolina 29201, United States
| | - Jie Wang
- Department of Mechanical Engineering, University of South Carolina , Columbia, South Carolina 29201, United States
| | - Yan Chen
- Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Ke An
- Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Dong Ma
- Chemical and Engineering Materials Division, Neutron Sciences Directorate, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Thomas Vogt
- Nano Center & Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29201, United States
| | - Kevin Huang
- Department of Mechanical Engineering, University of South Carolina , Columbia, South Carolina 29201, United States
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124
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Zhu Z, Wei Z, Zhao Y, Chen M, Wang S. Properties characterization of tungsten doped strontium ferrites as cathode materials for intermediate temperature solid oxide fuel cells. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.08.059] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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125
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Sun Z, Fan W, Liu P. Synthesis and characterization of Sr0.75Y0.25Co0.9Ru0.1O3−δ
perovskite as a solid oxide fuel cell cathode material. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3753-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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126
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127
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Kurnia F, Cheung J, Cheng X, Sullaphen J, Kalinin SV, Valanoor N, Vasudevan RK. Nanoscale Probing of Elastic-Electronic Response to Vacancy Motion in NiO Nanocrystals. ACS NANO 2017; 11:8387-8394. [PMID: 28742320 DOI: 10.1021/acsnano.7b03826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Measuring the diffusion of ions and vacancies at nanometer length scales is crucial to understanding fundamental mechanisms driving technologies as diverse as batteries, fuel cells, and memristors; yet such measurements remain extremely challenging. Here, we employ a multimodal scanning probe microscopy (SPM) technique to explore the interplay between electronic, elastic, and ionic processes via first-order reversal curve I-V measurements in conjunction with electrochemical strain microscopy (ESM). The technique is employed to investigate the diffusion of oxygen vacancies in model epitaxial nickel oxide (NiO) nanocrystals with resistive switching characteristics. Results indicate that opening of the ESM hysteresis loop is strongly correlated with changes to the resonant frequency, hinting that elastic changes stem from the motion of oxygen (or cation) vacancies in the probed volume of the SPM tip. These changes are further correlated to the current measured on each nanostructure, which shows a hysteresis loop opening at larger (∼2.5 V) voltage windows, suggesting the threshold field for vacancy migration. This study highlights the utility of local multimodal SPM in determining functional and chemical changes in nanoscale volumes in nanostructured NiO, with potential use to explore a wide variety of materials including phase-change memories and memristive devices in combination with site-correlated chemical imaging tools.
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Affiliation(s)
- Fran Kurnia
- School of Materials Science and Engineering, University of New South Wales , Sydney 2052, Australia
| | - Jeffrey Cheung
- School of Materials Science and Engineering, University of New South Wales , Sydney 2052, Australia
| | - Xuan Cheng
- School of Materials Science and Engineering, University of New South Wales , Sydney 2052, Australia
| | - Jivika Sullaphen
- School of Materials Science and Engineering, University of New South Wales , Sydney 2052, Australia
| | - Sergei V Kalinin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Nagarajan Valanoor
- School of Materials Science and Engineering, University of New South Wales , Sydney 2052, Australia
| | - Rama K Vasudevan
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
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128
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Huang YL, Pellegrinelli C, Wachsman ED. Oxygen Dissociation Kinetics of Concurrent Heterogeneous Reactions on Metal Oxides. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01096] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi-Lin Huang
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Christopher Pellegrinelli
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Eric D. Wachsman
- Maryland Energy Innovation Institute and Department of Materials Science & Engineering, University of Maryland, College Park, Maryland 20742, United States
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129
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Kang YS, Heo Y, Kim P, Yoo SJ. Preparation and characterization of Cu–N–C electrocatalysts for oxygen reduction reaction in alkaline anion exchange membrane fuel cells. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.03.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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130
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Chen X, Guan C, Xiao G, Peng C, Wang JQ. A perspective on hydrogen production via high temperature steam electrolysis. Sci China Chem 2017. [DOI: 10.1007/s11426-017-9038-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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131
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Twenty years of the Journal of Solid State Electrochemistry. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3648-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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132
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Huang YL, Hussain AM, Pellegrinelli C, Xiong C, Wachsman ED. Chromium Poisoning Effects on Surface Exchange Kinetics of La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ. ACS APPLIED MATERIALS & INTERFACES 2017; 9:16660-16668. [PMID: 28445026 DOI: 10.1021/acsami.7b02762] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The presence of Cr has already been reported in literature to cause severe degradation to La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF). However, fundamental understanding of Cr effects on the surface exchange kinetics is still lacking. For the first time, in situ gas phase isotopic oxygen exchange was utilized to quantitatively determine Cr effect on oxygen exchange kinetics of LSCF powder as a function of temperature and water vapor. Our investigations revealed that the formation of secondary phases such as SrCrO4, Cr2O3, Cr-Co-Fe-O, and La-Co-Fe-O can affect both the oxygen dissociation step and overall surface exchange. Specifically, Cr-containing secondary phases on the surface not only decrease the active sites for surface reactions but also alter the nearby stoichiometry of the LSCF matrix, thereby limiting surface oxygen transport. In addition, water molecules actively participate in the surface reactions and can further block the active sites.
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Affiliation(s)
- Yi-Lin Huang
- University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States
| | - A Mohammed Hussain
- University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States
| | - Christopher Pellegrinelli
- University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States
| | - Chunyan Xiong
- University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States
- Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China
- Wuhan Institute of Technology , Wuhan, Hubei 430205, China
| | - Eric D Wachsman
- University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States
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133
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Omotayo Akande S, Chroneos A, Schwingenschlögl U. O vacancy formation in (Pr/Gd)BaCo 2O 5.5 and the role of antisite defects. Phys Chem Chem Phys 2017; 19:11455-11459. [PMID: 28425534 DOI: 10.1039/c7cp01942d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In search for materials for intermediate temperature solid oxide fuel cells, (Pr/Gd)BaCo2O5.5 is investigated by first principles calculations. Antisite defects are considered as they may modify the electronic and O diffusion properties but are rarely studied in double perovskite oxides. Octahedrally coordinated Co atoms are shown to realize intermediate and high spin states for PrBaCo2O5.5 and GdBaCo2O5.5, respectively, while pyramidally coordinated Co atoms always have high spin. It turns out that O vacancy formation is significantly easier in PrBaCo2O5.5 than in GdBaCo2O5.5, the difference in formation energy being hardly modified by antisite defects. While pyramidally coordinated Co atoms are not affected, we show that the presence of antisite defects causes parts of the octahedrally coordinated Co atoms to switch from intermediate to high spin.
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Affiliation(s)
- Salawu Omotayo Akande
- King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia.
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134
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Influence of the electrode/electrolyte interface structure on the performance of Pr 0.8 Sr 0.2 Fe 0.7 Ni 0.3 O 3-δ as Solid Oxide Fuel Cell cathode. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.03.179] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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135
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Almar L, Morata A, Torrell M, Gong M, Andreu T, Liu M, Tarancón A. A Durable Electrode for Solid Oxide Cells: Mesoporous Ce0.8Sm0.2O1.9 Scaffolds Infiltrated with a Sm0.5Sr0.5CoO3-δ Catalyst. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.03.149] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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136
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Controlling Oxygen Mobility in Ruddlesden-Popper Oxides. MATERIALS 2017; 10:ma10040368. [PMID: 28772732 PMCID: PMC5506909 DOI: 10.3390/ma10040368] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 01/08/2023]
Abstract
Discovering new energy materials is a key step toward satisfying the needs for next-generation energy conversion and storage devices. Among the various types of oxides, Ruddlesden–Popper (RP) oxides (A2BO4) are promising candidates for electrochemical energy devices, such as solid oxide fuel cells, owing to their attractive physicochemical properties, including the anisotropic nature of oxygen migration and controllable stoichiometry from oxygen excess to oxygen deficiency. Thus, understanding and controlling the kinetics of oxygen transport are essential for designing optimized materials to use in electrochemical energy devices. In this review, we first discuss the basic mechanisms of oxygen migration in RP oxides depending on oxygen nonstoichiometry. We then focus on the effect of changes in the defect concentration, crystallographic orientation, and strain on the oxygen migration in RP oxides. We also briefly review their thermal and chemical stability. Finally, we conclude with a perspective on potential research directions for future investigation to facilitate controlling oxygen ion migration in RP oxides.
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137
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Shkerin SN, Kyz’min AV, Gyrdasova OI, Stroeva AY, Nikonov AV. Electrical conductivity and thermal expansion of La1 – x Sr x Fe1 – y Ga y O3 – δ (x = 0.2–0.5; y = 0–0.4). RUSS J ELECTROCHEM+ 2017. [DOI: 10.1134/s1023193517020124] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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138
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A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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139
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Li M, Zheng M, Hu B, Zhang Y, Xia C. Improving electrochemical performance of lanthanum strontium ferrite by decorating instead of doping cobaltite. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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140
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Wang Y, Gao H. Influence of a ZrO2 Support and Its Surface Structures on the Stability and Nucleation of Ptn (n = 1–5) Clusters: A Density Functional Theory Study. J Phys Chem B 2017; 121:2132-2141. [DOI: 10.1021/acs.jpcb.7b00017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yanxin Wang
- Key Laboratory of Plant Resources
and Chemistry in Arid Regions, Xinjiang Technical Institute of Physics
and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Hongwei Gao
- Key Laboratory of Plant Resources
and Chemistry in Arid Regions, Xinjiang Technical Institute of Physics
and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
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141
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Lee D, Tan J, Chae KH, Jeong B, Soon A, Ahn SJ, Kim J, Moon J. Chemically Driven Enhancement of Oxygen Reduction Electrocatalysis in Supported Perovskite Oxides. J Phys Chem Lett 2017; 8:235-242. [PMID: 27981844 DOI: 10.1021/acs.jpclett.6b02503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Perovskite oxides have the capacity to efficiently catalyze the oxygen reduction reaction (ORR), which is of fundamental importance for electrochemical energy conversion. While the perovskite catalysts have been generally utilized with a support, the role of the supports, regarded as inert toward the ORR, has been emphasized mostly in terms of the thermal stability of the catalyst system and as an ancillary transport channel for oxygen ions during the ORR. We demonstrate a novel approach to improving the catalytic activity of perovskite oxides for solid oxide fuel cells by controlling the oxygen-ion conducting oxide supports. Catalytic activities of (La0.8Sr0.2)0.95MnO3 perovskite thin-film placed on different oxide supports are characterized by electrochemical impedance spectroscopy and X-ray absorption spectroscopy. These analyses confirm that the strong atomic orbital interactions between the support and the perovskite catalyst enhance the surface exchange kinetics by ∼2.4 times, in turn, improving the overall ORR activity.
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Affiliation(s)
- Daehee Lee
- Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea
| | - Jeiwan Tan
- Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea
| | - Keun Hwa Chae
- Advanced Analysis Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea
| | - Beomgyun Jeong
- Division of Material Science, Korea Basic Science Institute , Daejeon 34133, Republic of Korea
| | - Aloysius Soon
- Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea
| | - Sung-Jin Ahn
- Samsung Advanced Institute of Technology , Gyeonggi-do 16678, Republic of Korea
| | - Joosun Kim
- High Temperature Energy Materials Research Center, Korea Institute of Science and Technology , Seoul 02792, Republic of Korea
| | - Jooho Moon
- Department of Materials Science and Engineering, Yonsei University , Seoul 03722, Republic of Korea
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142
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Pavlovska O, Vasylechko L, Buryy O. Thermal Behaviour of Sm0.5 R 0.5FeO3 (R = Pr, Nd) Probed by High-Resolution X-ray Synchrotron Powder Diffraction. NANOSCALE RESEARCH LETTERS 2016; 11:107. [PMID: 26920152 PMCID: PMC4769243 DOI: 10.1186/s11671-016-1328-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 02/22/2016] [Indexed: 06/05/2023]
Abstract
Mixed ferrites Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 with orthorhombic perovskite structure isotypic with GdFeO3 were synthesized by solid-state reaction technique in air at 1473 K. Structural parameters obtained at room temperature prove a formation of continuous solid solutions in the SmFeO3-PrFeO3 and SmFeO3-NdFeO3 pseudo-binary systems. Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 show strongly anisotropic nonlinear thermal expansion: thermal expansion in the b direction is twice lower than in the a and c directions. The average linear thermal expansion coefficients of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 in the temperature range of 298-1173 K are in the limits of (9.0-11.1) × 10(-6) K(-1), which is close to the values reported for the parent RFeO3 compounds. Subtle anomalies in the lattice expansion of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 detected at 650-750 K reflect magnetoelastic coupling at the magnetic ordering temperature T N.
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Affiliation(s)
- Olena Pavlovska
- Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
| | - Leonid Vasylechko
- Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
| | - Oleh Buryy
- Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
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143
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Chen K, Li N, Ai N, Cheng Y, Rickard WDA, Jiang SP. Polarization-Induced Interface and Sr Segregation of in Situ Assembled La 0.6Sr 0.4Co 0.2Fe 0.8O 3-δ Electrodes on Y 2O 3-ZrO 2 Electrolyte of Solid Oxide Fuel Cells. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31729-31737. [PMID: 27808496 DOI: 10.1021/acsami.6b11665] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Application of cobaltite-based electrodes such as La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) on Y2O3-ZrO2 (YSZ) electrolyte in solid oxide fuel cells (SOFCs) generally requires the use of a doped ceria barrier layer to prevent the interaction between LSCF and YSZ during sintering at high temperatures. In this paper, we report for the first time an in situ assembly approach to directly incorporate LSCF cathode to YSZ electrolyte without the use of a doped ceria barrier layer and without presintering at high temperatures. A Ni-YSZ anode-supported YSZ electrolyte cell with an in situ assembled LSCF electrode exhibits a peak power density of 1.72 W cm-2 at 750 °C. However, the cell performance degrades significantly at 500 mAcm-2 and 750 °C. The results indicate that cathodic polarization not only induces the formation of the interface but also accelerates the Sr segregation. The segregated Sr migrates to the LSCF electrode/YSZ electrolyte surface and forms an SrO layer. Using a Sr-free LaCoO3-δ composite cathode overcomes the Sr segregation problem, showing an excellent peak power density of 1.2 Wcm-2 and good stability at 750 °C for over 100 h. The present study shows that cobaltite-based perovskites can be directly used on YSZ-based electrolyte via the in situ assembly providing an effective means to advance the application of highly active mixed ionic/electronic conducting cathodes to YSZ electrolyte-based SOFCs.
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Affiliation(s)
- Kongfa Chen
- College of Materials Science and Engineering, Fuzhou University , Fuzhou, Fujian350108, China
| | - Na Li
- College of Science, Heilongjiang University of Science and Technology , Harbin 150022, China
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144
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McSloy AJ, Kelly PF, Slater PR, Panchmatia PM. A computational study of doped olivine structured Cd 2GeO 4: local defect trapping of interstitial oxide ions. Phys Chem Chem Phys 2016; 18:26284-26290. [PMID: 27711759 DOI: 10.1039/c6cp05436f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Computational modelling techniques have been employed to investigate defects and ionic conductivity in Cd2GeO4. We show due to highly unfavourable intrinsic defect formation energies the ionic conducting ability of pristine Cd2GeO4 is extremely limited. The modelling results suggest trivalent doping on the Cd site as a viable means of promoting the formation of the oxygen interstitial defects. However, the defect cluster calculations for the first time explicitly suggest a strong association of the oxide defects to the dopant cations and tetrahedral units. Defect clustering is a complicated phenomenon and therefore not trivial to assess. In this study the trapping energies are explicitly quantified. The trends are further confirmed by molecular dynamic simulations. Despite this, the calculated diffusion coefficients do suggest an enhanced oxide ion mobility in the doped system compared to the pristine Cd2GeO4.
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Affiliation(s)
- Adam J McSloy
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, UK.
| | - Paul F Kelly
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, UK.
| | - Peter R Slater
- School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Pooja M Panchmatia
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, UK.
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145
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Vasudevan RK, Ziatdinov M, Jesse S, Kalinin SV. Phases and Interfaces from Real Space Atomically Resolved Data: Physics-Based Deep Data Image Analysis. NANO LETTERS 2016; 16:5574-5581. [PMID: 27517608 DOI: 10.1021/acs.nanolett.6b02130] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Advances in electron and scanning probe microscopies have led to a wealth of atomically resolved structural and electronic data, often with ∼1-10 pm precision. However, knowledge generation from such data requires the development of a physics-based robust framework to link the observed structures to macroscopic chemical and physical descriptors, including single phase regions, order parameter fields, interfaces, and structural and topological defects. Here, we develop an approach based on a synergy of sliding window Fourier transform to capture the local analog of traditional structure factors combined with blind linear unmixing of the resultant 4D data set. This deep data analysis is ideally matched to the underlying physics of the problem and allows reconstruction of the a priori unknown structure factors of individual components and their spatial localization. We demonstrate the principles of this approach using a synthetic data set and further apply it for extracting chemical and physically relevant information from electron and scanning tunneling microscopy data. This method promises to dramatically speed up crystallographic analysis in atomically resolved data, paving the road toward automatic local structure-property determinations in crystalline and quasi-ordered systems, as well as systems with competing structural and electronic order parameters.
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Affiliation(s)
- Rama K Vasudevan
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge Tennessee 37831, United States
| | - Maxim Ziatdinov
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge Tennessee 37831, United States
| | - Stephen Jesse
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge Tennessee 37831, United States
| | - Sergei V Kalinin
- Institute for Functional Imaging of Materials and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge Tennessee 37831, United States
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146
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Roehrens D, Packbier U, Fang Q, Blum L, Sebold D, Bram M, Menzler N. Operation of Thin-Film Electrolyte Metal-Supported Solid Oxide Fuel Cells in Lightweight and Stationary Stacks: Material and Microstructural Aspects. MATERIALS 2016; 9:ma9090762. [PMID: 28773883 PMCID: PMC5457052 DOI: 10.3390/ma9090762] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 08/26/2016] [Accepted: 09/02/2016] [Indexed: 11/16/2022]
Abstract
In this study we report on the development and operational data of a metal-supported solid oxide fuel cell with a thin film electrolyte under varying conditions. The metal-ceramic structure was developed for a mobile auxiliary power unit and offers power densities of 1 W/cm2 at 800 °C, as well as robustness under mechanical, thermal and chemical stresses. A dense and thin yttria-doped zirconia layer was applied to a nanoporous nickel/zirconia anode using a scalable adapted gas-flow sputter process, which allowed the homogeneous coating of areas up to 100 cm2. The cell performance is presented for single cells and for stack operation, both in lightweight and stationary stack designs. The results from short-term operation indicate that this cell technology may be a very suitable alternative for mobile applications.
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Affiliation(s)
- Daniel Roehrens
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Jülich 52425, Germany.
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Jülich 52425, Germany.
| | - Ute Packbier
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-3: Electrochemical Process Engineering, Jülich 52425, Germany.
| | - Qingping Fang
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-3: Electrochemical Process Engineering, Jülich 52425, Germany.
| | - Ludger Blum
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-3: Electrochemical Process Engineering, Jülich 52425, Germany.
| | - Doris Sebold
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Jülich 52425, Germany.
| | - Martin Bram
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Jülich 52425, Germany.
- Christian Doppler Laboratory for Interfaces in Metal-Supported Electrochemical Energy Converters, Jülich 52425, Germany.
| | - Norbert Menzler
- Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-1: Materials Synthesis and Processing, Jülich 52425, Germany.
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147
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New Rhenium-Doped SrCo 1-xRe xO 3-δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells. MATERIALS 2016; 9:ma9090717. [PMID: 28773844 PMCID: PMC5457058 DOI: 10.3390/ma9090717] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 08/12/2016] [Accepted: 08/18/2016] [Indexed: 12/02/2022]
Abstract
In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO3−δ, we have designed and prepared SrCo1−xRexO3−δ phases (x = 0.05 and 0.10), successfully avoiding the competitive hexagonal 2H polytypes. Their performance as cathode materials in intermediate-temperature solid oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and in situ temperature-dependent neutron powder diffraction (NPD) experiments for x = 0.10. At room temperature, SrCo1−xRexO3−δ perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ ao, c = 2ao (ao = 3.861 and 3.868 Å, for x = 0.05 and 0.10, respectively). The crystal structure evolves above 380 °C to a simple cubic perovskite unit cell, as observed from in-situ NPD data. The electrical conductivity gave maximum values of 43.5 S·cm−1 and 51.6 S·cm−1 for x = 0.05 and x = 0.10, respectively, at 850 °C. The area specific resistance (ASR) polarization resistance determined in symmetrical cells is as low as 0.087 Ω·cm2 and 0.065 Ω·cm2 for x = 0.05 and x = 0.10, respectively, at 850 °C. In single test cells these materials generated a maximum power of around 0.6 W/cm2 at 850 °C with pure H2 as a fuel, in an electrolyte-supported configuration with La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) as the electrolyte. Therefore, we propose the SrCo1−xRexO3−δ (x = 0.10 and 0.05) perovskite oxides as promising candidates for cathodes in IT-SOFC.
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148
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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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149
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Ma Z, Sun C, Ma C, Wu H, Zhan Z, Chen L. Ni doped La 0.6 Sr 0.4 FeO 3- δ symmetrical electrode for solid oxide fuel cells. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(15)61116-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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150
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Popov MP, Bychkov SF, Nemudry AP. Modification of mixed conducting Ba0.5Sr0.5Co0.8Fe0.2O3–δ by partial substitution of cobalt with tungsten. RUSS J ELECTROCHEM+ 2016. [DOI: 10.1134/s1023193516070156] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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