Article
Electrochemistry
Matthaeus Siebenhofer, Ulrich Haselmann, Andreas Nenning, Gernot Friedbacher, Andreas Ewald Bumberger, Stefan Wurster, Werner Artner, Herbert Hutter, Zaoli Zhang, Juergen Fleig, Markus Kubicek
Summary: The surface morphology and chemistry changes of LSC thin films grown on different substrates were studied under SOFC operation conditions for 100 hours. The formation of particles at the LSC surface was monitored using atomic force microscopy. Different particle formation dynamics were observed depending on the thin film structure. Electron microscopy revealed that the particles were rich in Sr and S. Various measurements were performed on degraded LSC thin films, showing the presence of sulfur on the LSC surface and A-site cation enrichment. Impedance spectroscopy demonstrated an increase in polarization resistance and its activation energy for LSC grown on YSZ over the degradation period.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
R. K. Lenka, P. K. Patro, Vivek Patel, L. Muhmood, T. Mahata
Summary: This study extensively investigates the functional properties of Nd2NiO4+delta based materials doped with different alkaline earth metal ions for SOFC applications. Results show that at high temperatures, materials doped with Ca and Sr exhibit higher electrical conductivity compared to undoped materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Matthaeus Siebenhofer, Christoph Riedl, Andreas Nenning, Werner Artner, Christoph Rameshan, Alexander Karl Opitz, Juergen Fleig, Markus Kubicek
Summary: Minimizing the overpotential at the air electrode of solid oxide fuel cells (SOFC) is crucial for its broader application. Surface modification, including Sr decoration, can alter the oxygen exchange kinetics at SOFC cathode surfaces. However, the mechanism behind this effect is still debated. This study used in situ impedance spectroscopy to investigate the effect of Sr decorations under different deposition conditions and found opposing effects of Sr decoration depending on the deposition temperature and gas phase interactions.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Ceramics
Hongpeng Fan, Zhijun Liu, Yang Wu, Qin Wang, Jun Yang, Wanbing Guan, Liang Han, Jianxin Wang
Summary: The performance of solid oxide fuel cells is improved by physically mixing Ce0(.9)Gd0(.1)O(1.95) (GDC) in La0(.6)Sr0(.4)CoO(3-)(& delta;) (LSC) cathode. The grain size and chemical compatibility of the powder were analyzed using X-ray diffraction, and scanning electron microscopy was used to observe the microstructure of powder and cells. The LSC-GDC (5:5) cathode showed the minimal thermal expansion coefficient, smallest cathode polarization resistance, lowest activation energy, highest power density, and long-term stability.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Electrochemistry
B. V. Voloshin, E. Koshevoi, A. S. Ulihin, M. P. Popov, A. P. Nemudry
Summary: The substitution of 5% ferroactive molybdenum cations for iron in the La0.6Sr0.4Co0.2Fe0.8O3 - delta (LSCF) structure significantly increases the electric conductivity. Using powder X-ray diffraction, the researchers identified the solubility limit of molybdenum in rhombohedral perovskite structure. It was found that the transport characteristics of La0.6Sr0.4Co0.2Fe0.75Mo0.05O3 - delta (LSCFM5) make it suitable as a cathode material in intermediate temperature solid oxide fuel cells (IT SOFCs).
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Christian Berger, Edith Bucher, Judith Lammer, Christina Nader, Werner Sitte
Summary: Compounds in the series La0.8-xNdxCa0.2FeO3-delta (0.1 <= x <= 0.7) were synthesized via a sol-gel route. The materials were found to crystallize as single-phase orthorhombic perovskites for x values between 0 and 0.6, with Nd substitution impacting the unit cell volume and thermal expansion behavior. Additionally, the transition from orthorhombic to trigonal modification observed in La0.8Ca0.2FeO3-delta was suppressed in Nd-substituted compounds.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Chuangang Yao, Jixing Yang, Sigeng Chen, Jian Meng, Kedi Cai, Qingguo Zhang
Summary: The study investigated the effects of Cu doping on SrFe0.9-xCuxW0.1O3-delta samples as SOFC cathode materials. Cu doping decreased the oxygen content, leading to decreased electrical conductivity and increased thermal expansion coefficient. Within a certain range, Cu doping can reduce ASR values and enhance the activation energy for ORR.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jianan Zan, Shenglin Wang, Dingshan Zheng, Fushao Li, Weimin Chen, Qimin Pei, Long Jiang
Summary: By systematically investigating the physicochemical properties of layered perovskite PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF) oxide, it is found that PBSCF exhibits promising application prospects in intermediate temperature solid oxide fuel cells due to its good power density and structural stability in oxygen reduction reactions.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Physical
Jinghe Bai, Zhiying Han, Bu Lv, Xu Chen, Xiaofei Zhu, Defeng Zhou
Summary: BSFC cathode material was prepared using electrospinning and sol-gel methods, and the effect of sintering temperature on its properties was investigated. The results showed that low-temperature calcination improved the structure and performance of the fibers, with BSFC-F800 exhibiting lower resistance and higher power density at 700 degrees Celsius.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Cuicui Sun, Yu Shen, Fang Wang, Qian Duan
Summary: Nano-sized hollow porous network composite cathode LSF-BZCY is prepared by electrostatic spinning and applied to anode-supported proton-conducting solid oxide fuel cell. The LSF-BZCY composite cathode exhibits loose texture and porous nanofiber structure, and shows excellent electrochemical performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Sergej Raznjevic, Matthaeus Siebenhofer, Andreas E. Bumberger, Christin Boehme, Christoph Riedl, Zhuo Chen, Markus Kubicek, Zaoli Zhang
Summary: During high-resolution transmission electron microscopy, the electron beam was used to induce a phase transition in La0.6Sr0.4CoO2.5 (LSC) from a brownmillerite ordering to an oxygen deficient perovskite structure. The phase transition was caused by knock-on processes that affect oxygen vacancies in terms of a transition from structural vacancies toward extremely high concentrations of randomly distributed point defects in the ABO(3) structure.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Zhangfa Huang, Zhijun Liu, Hua Hu, Jianxin Wang, Ming Chen, Baohua Cao, Qin Wang, Jun Yang, Wanbing Guan, Tongxiang Liang
Summary: A Co-containing composite cathode material with low thermal expansion coefficient and good compatibility has been prepared by the solid-liquid method. The cathode exhibits low polarization resistance and high power density, making it a promising material for intermediate temperature solid oxide fuel cells.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Fulan Zhong, Xinmin Wang, Cheng Han, Huihuang Fang, Yunyun Huang, Yu Luo, Chongqi Chen, Li Lin, Chaktong Au, Lilong Jiang
Summary: By adjusting the stoichiometric proportion of Ni and Mn, a series of defective spinel Mg0.4NixMn2.6-xO4+delta was developed, which exhibited optimal electronic conductivity and oxygen-vacancy concentration. The optimized MN(1.4)MO showed remarkably high power density and stability, making it a promising cathode material for intermediate temperature solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Monica Chivite Lacaba, Alex Alveal, Jesus Prado-Gonjal, Jose Antonio Alonso, Maria Teresa Fernandez Diaz, Loreto Troncoso, Vanessa Cascos
Summary: Recent studies have explored the stabilization of perovskite phases in the SrCoO3-delta system at room temperature by partially replacing Co atoms with highly charged cations like Ti4+ in SrCo0.95Ti0.05O3-delta. This material demonstrates excellent performance as a cathode for SOFCs at intermediate temperatures (800-850 degrees C). This study aims to further improve the cathode by reducing its Co content and thermal expansion coefficient, resulting in the successful synthesis of SrCo0.50Fe0.45Ti0.05O3-delta perovskite with promising mechanical and electrical properties.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Electrochemistry
Andreas Nenning, Stefan Reuter, Richard Schlesinger, Harald Summerer, Raffael Ramehsan, Lorenz Lindenthal, Manuel Holzmann, Tobias M. Huber, Christoph Rameshan, Juergen Fleig, Alexander K. Opitz
Summary: This study presents a novel three-electrode geometry to measure impedance spectra and overpotentials of individual electrodes in solid oxide cells. Using physically justified equivalent circuit models, the study shows that the changes in impedance and XPS spectra due to overpotential are related to oxygen vacancy and electronic point defect concentrations.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Christian Berger, Edith Bucher, Andreas Windischbacher, A. Daniel Boese, Werner Sitte
JOURNAL OF SOLID STATE CHEMISTRY
(2018)
Article
Chemistry, Physical
Christian Berger, Edith Bucher, Christian Gspan, Alexander Menzel, Werner Sitte
SOLID STATE IONICS
(2018)
Article
Materials Science, Multidisciplinary
Gregor Mori, Karl J. Vidic, Edith Bucher, Muhammad Yasir, Daniel Hornauer, Manfred Nachtnebel, Harald Fitzek, Hartmuth Schroettner
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2019)
Article
Electrochemistry
A. Egger, M. Perz, E. Bucher, C. Gspan, W. Sitte
Article
Chemistry, Physical
Christian Berger, Edith Bucher, Andreas Egger, Nina Schroedl, Judith Lammer, Christian Gspan, Rotraut Merkle, Werner Grogger, Joachim Maier, Werner Sitte
SOLID STATE IONICS
(2020)
Article
Chemistry, Physical
Vanja Subotic, Thomas Thaller, Benjamin Koenigshofer, Norbert H. Menzler, Edith Bucher, Andreas Egger, Christoph Hochenauer
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Electrochemistry
Nina Schrodl, Andreas Egger, Judith Lammer, Ferdinand Hofer, Werner Sitte
Summary: Long-term stability tests on Pr2NiO4+delta air electrodes were conducted at 800 degrees C, revealing good stability under dry conditions but decreased performance in a humid environment with chromium introduction. Post-test analyses showed a correlation between Cr-deposition extent and electrode degradation, supporting enhanced resilience of Pr2NiO4+delta against Cr-poisoning in SOEC mode.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Christian Berger, Edith Bucher, Judith Lammer, Christina Nader, Werner Sitte
Summary: Compounds in the series La0.8-xNdxCa0.2FeO3-delta (0.1 <= x <= 0.7) were synthesized via a sol-gel route. The materials were found to crystallize as single-phase orthorhombic perovskites for x values between 0 and 0.6, with Nd substitution impacting the unit cell volume and thermal expansion behavior. Additionally, the transition from orthorhombic to trigonal modification observed in La0.8Ca0.2FeO3-delta was suppressed in Nd-substituted compounds.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Christian Berger, Edith Bucher, Rotraut Merkle, Christina Nader, Judith Lammer, Werner Grogger, Joachim Maier, Werner Sitte
Summary: Self-generated composites of BaCe1-(x+z)FexYzO3-delta series were synthesized by one-pot method, consisting of proton and electron conducting phases, suitable for electrode materials in protonic ceramic fuel cells and electrolyzers. X-ray diffraction and scanning electron microscopy revealed the presence of Fe-rich phases and Ce-rich perovskite phases, with Y substitution influencing mutual solubility. Additional strategies to enhance proton uptake by substituting ions with different basicity are discussed.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Manuela Nimmervoll, Gregor Mori, Edith Bucher, Alexander Schmid, Roland Haubner
Summary: This study investigates the high-temperature corrosion behavior of N10276 steel in an atmosphere containing H2S and HCl, explaining the corrosion behavior at 480°C and 680°C by considering the impact of main alloying elements, thermodynamic considerations, and kinetic effects. The corrosion behavior of N10276 is compared with previously tested Fe-Cr-Ni alloys, revealing differences in their behavior in the same corrosive atmosphere.
Article
Microscopy
Judith Lammer, Christian Berger, Stefan Loeffler, Daniel Knez, Paolo Longo, Gerald Kothleitner, Ferdinand Hofer, Georg Haberfehlner, Edith Bucher, Werner Sitte, Werner Grogger
Summary: In this work, a procedure to determine the concentration of two elements within atomic columns from EELS elemental maps was presented and successfully applied to Ba1.1La1.9Fe2O7.
Article
Materials Science, Multidisciplinary
Manuela Nimmervoll, Gregor Mori, Edith Bucher, Stefan Honig, Roland Haubner
Summary: This paper presents a detailed analysis of high-temperature corrosion mechanisms in reducing atmospheres containing HCl and H2S. The analysis is based on experimental observations and thermodynamic calculations. It also explains the corrosion behavior of a specific alloy and provides correlations between thermodynamic calculations and practical findings.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2022)
Article
Chemistry, Physical
Sarah Eisbacher-Lubensky, Andreas Egger, Werner Sitte, Edith Bucher
Summary: The rare earth nickelate La2Ni0.9Co0.1O4+delta (LNCO) was synthesized via the citrate/EDTA method, and it was confirmed to have a single-phase structure. The substitution of nickel with cobalt in LNCO led to higher values of the surface exchange coefficient and slightly reduced electronic conductivity. The oxygen non-stoichiometry of LNCO was studied, and its thermal expansion coefficients were found to be similar to common solid electrolytes. LNCO shows potential as an air electrode in solid oxide cells.
SOLID STATE IONICS
(2023)
Article
Electrochemistry
Christian Berger, Andreas Egger, Rotraut Merkle, Edith Bucher, Benjamin Stuhlhofer, Nina Schroedl, Judith Lammer, Christian Gspan, Gennady Logvenov, Joachim Maier, Werner Sitte
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2019)
