Article
Materials Science, Ceramics
Jinghe Bai, Defeng Zhou, Xiaofei Zhu, Ning Wang, Qingwen Liang, Ruyi Chen, Hongyan Lu, Jinmeng Li, Wenfu Yan
Summary: In this paper, the ORR activity of the Co-free SOFC cathode material is effectively increased by doping low-valence Ln(3+) ions at the B-site of Fe-based perovskite BSF. The doped BSFN shows improved oxygen exchange and diffusion rate, resulting in lower resistance and higher power density compared to BSF. The BSFN-based single cell also exhibits better long-term stability due to its lower thermal expansion coefficient.
CERAMICS INTERNATIONAL
(2023)
Article
Electrochemistry
Juntao Gao, Qiang Li, Zhiping Zhang, Zhe Lu, Bo Wei
Summary: BSFP oxide, as a cathode material for SOFC, shows excellent chemical compatibility and low polarization resistance, suggesting its promising application in SOFC operation at intermediate temperatures.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Bo Liu, Na Li, Liping Sun, Qiang Li, Lihua Huo, Zhao Hui
Summary: Doped rare earth elements significantly influence the properties of Nd(1.9)Ln(0.1)CuO(4), with Nd1.9Ce0.1CuO4 showing the highest performance in terms of surface oxygen adsorption, DC conductivity, and electrocatalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Wendi Yi, Yaopeng Tian, Chunling Lu, Biao Wang, Yaowei Liu, Shoushan Gao, Bingbing Niu
Summary: This study presents the development of a new perovskite oxide, BCZY, as a cathode material for SOFCs. The BCZY cathode demonstrates excellent stability, good ORR activity, and superior CO2 tolerance at intermediate temperatures. The results indicate that BCZY could be a potential cathode material for IT-SOFCs.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
T. Ghorbani-Moghadam, A. Kompany, M. Golmohammad
Summary: The effect of Ni substitution in Co sites of La0.7Sr1.3CoO4 Ruddlesden-Popper oxides was investigated as a cathode for solid oxide fuel cells. Structural and lattice dynamic analyses showed that La0.7Sr1.3Co1-xNixO4 had a tetragonal structure and the lattice volume decreased with Ni substitution due to stabilization of Co3+ in low spin state. X-ray photoelectron spectroscopy indicated a decrease in the Co4+/Co3+ ratio and an increase in oxygen vacancy and adsorption with enhanced Ni dopant. Electrochemical impedance analysis revealed that doping La0.7Sr1.3CoO4 with Ni resulted in a significant decrease in polarization area specific resistance, making these compounds suitable cathode candidates for IT-SOFC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
Chengyi Ai, Tingting Li, Rongzheng Ren, Zhenhua Wang, Wang Sun, Jinsheng Feng, Kening Sun, Jinshuo Qiao
Summary: The novel proton conducting solid oxide fuel cell (H-SOFC) shows good oxygen reduction reaction activity and enhanced electrochemical performance through the investigation of the K2NiF4-type cathode material Pr2-xBaxNi0.6Cu0.4O4+delta, with increased electrical conductivity, oxygen vacancy concentration and proton conductivity, achieving a high peak power density at 750 degrees Celsius.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Zhenwei Wang, Haibin Sun, Jiao Li, Xue Guo, Qiangqiang Hu, Zanzhong Yang, Fangyong Yu, Guochang Li
Summary: By infiltrating ESB, the polarization resistances and activation energy of LSCF cathodes were significantly reduced, improving the oxygen reduction reaction process and enhancing the performance of intermediate-temperature solid oxide fuel cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Zujun Nie, Jingping Wang, Tian Xia, Guixiang Wang
Summary: A family of promising cathode materials Pr(1-x)Ca(x)Ba(0.94)Co(2)O(5+delta) is reported for efficient ORR activity and outstanding stability in intermediate-temperature solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
K. P. Padmasree, Ke-Yu Lai, Arumugam Manthiram
Summary: The calcium cobaltite Ca(3-x)La(x)Co(4-y)CuyO(9+delta) doped with x and y = 0 and 0.1 showed slightly affected electrical and thermal properties, with the undoped sample exhibiting improved symmetrical cell performance in intermediate-temperature solid oxide fuel cells.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Hongxia Gu, Meigui Xu, Yufei Song, Chuan Zhou, Chao Su, Wei Wang, Ran Ran, Wei Zhou, Zongping Shao
Summary: A new perovskite SrCo0.8Ti0.1Ta0.1O3-delta (SCTT) with high electrical conductivities, appropriate oxygen vacancy concentrations, and high bulk diffusion capability has been developed, showing favorable oxygen reduction reaction (ORR) activity at intermediate temperatures. The SCTT material exhibits high peak power density and durability in solid oxide fuel cells and protonic ceramic fuel cells, potentially accelerating the commercialization of IT-SOFC technology.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Ceramics
Xiaowei Liu, Fangjun Jin, Ning Sun, Jiangxin Li, Yu Shen, Fang Wang, Jinhua Li
Summary: The study prepared NBC95+B composite cathode materials by introducing Nd defect with bismuth oxide, which effectively increased conductivity and reduced thermal expansion coefficient, showing good electrochemical performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yuwei Yang, Tian Xia, Shuang Li, Ziwei Dong, Qiang Li, Lihua Huo, Hui Zhao
Summary: This study synthesized and evaluated an A-site gadolinium-doped La0.33Ba0.62Gd0.05Co0.7Fe0.3O3-delta perovskite as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The results showed that this material exhibited outstanding catalytic activity for oxygen reduction reaction (ORR), surpassing the performance of traditional perovskite materials. It also demonstrated improved carbon dioxide tolerance compared to the pristine material.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Leyu Shen, Zhihong Du, Yang Zhang, Xu Dong, Hailei Zhao
Summary: The study shows that medium-entropy perovskites Sr(FeαTiβCoγMnζ)O3-δ (SFTCM) have potential as cathode materials for IT-SOFC, with lower thermal expansion coefficients, suppressed strontium surface segregation, and more stable polarization resistance while slightly reducing catalytic activity towards oxygen reduction reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Hongxia Gu, Chao Su, Chuan Zhou, Yang Liu, Yuan Zhang, Guangming Yang, Wei Zhou, Zongping Shao
Summary: Developing efficient cathode materials with durability and resistance to environmental impurities is crucial for the practical applications of intermediate temperature-solid oxide fuel cells (SOFCs). This study proposes a double perovskite cathode material, LaBa0.8Ca0.2Co2O5+delta (LBCC), which exhibits superior CO2 tolerance and favorable oxygen reduction activity. The LBCC cathode demonstrates low area specific resistance and stability in the presence of CO2, making it a promising candidate for SOFC applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yinghua Niu, Weirong Huo, Yuandong Yu, Wenjun Li, Yulin Chen, Weiqiang Lv
Summary: To lower the operating temperature and increase the durability of solid oxide fuel cells (SOFCs), there is increasing attention on developing cathode materials with good oxygen reduction reaction (ORR) activity in the intermediate temperature range (500-750 degrees C). Infiltrating catalysts on existing backbone materials has been proven to be an efficient method for constructing highly active and durable cathodes.
CHINESE CHEMICAL LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Liang Lu, Chunwen Sun, Jian Hao, Zelin Wang, Sergio F. Mayer, Maria Teresa Fernandez-Diaz, Jose Antonio Alonso, Bingsuo Zou
Summary: This work studies magnesium-doped Na3Zr2Si2PO12 as a solid electrolyte for solid-state Na-CO2 batteries, and utilizes a composite electrolyte composed of highly conductive Na3.2Zr1.9Mg0.1Si2PO12 and high processability PVDF-HFP to assemble a solid-state Na-CO2 battery, demonstrating promising performance.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Physical
Joao E. F. S. Rodrigues, Javier Gainza, Federico Serrano-Sanchez, Romualdo S. Silva Jr, Catherine Dejoie, Norbert M. Nemes, Oscar J. Dura, Jose L. Martinez, Jose Antonio Alonso
Summary: In this study, Gd-filled skutterudite GdxCo4Sb12 was prepared under high pressure and moderate temperature. The structural characterization revealed a filling fraction of x = 0.033(2) and an average bond length of 3.3499(3) angstrom. The lattice thermal expansion and Debye temperature were determined, showing that the application of the harmonic Debye theory underestimates the Debye temperature in skutterudites. The presence of Gd atom contributed to an ultra-low thermal conductivity and high thermoelectric efficiency.
Article
Materials Science, Multidisciplinary
J. E. Rodrigues, A. D. Rosa, J. Lopez-Sanchez, E. Sebastiani-Tofano, N. M. Nemes, J. L. Martinez, J. A. Alonso, O. Mathon
Summary: Understanding the electronic and structural changes in nickelates with a perovskite structure is crucial for their application as industrial devices. This study focuses on PrNiO3 and investigates the structural changes at a local level using X-ray absorption spectroscopy. The results reveal the presence of different phases and the coupling behavior between spin configuration and phonons. This approach provides new opportunities for similar studies in related materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Crystallography
Javier Gainza, Federico Serrano-Sanchez, Joao E. F. S. Rodrigues, Oscar J. J. Dura, Brenda Fragoso, Mateus M. M. Ferrer, Norbert M. M. Nemes, Jose L. Martinez, Maria T. Fernandez-Diaz, Jose A. Alonso
Summary: Among chalcogenide thermoelectric materials, SnTe is a promising alternative to toxic PbTe for intermediate temperature applications. Pure polycrystalline SnTe was obtained by arc melting and its structural evolution was studied using temperature-dependent neutron powder diffraction (NPD) from room temperature up to 973 K. The sample exhibited a cubic crystal structure (space group Fm-3m) with pronounced displacement parameters for Te atoms. The structural analysis allowed the determination of Debye model parameters and provided insights into the Sn-Te chemical bonds. SEM images revealed nanostructuration in layers below 30 nm, contributing to a reduced thermal conductivity of 2.5 W/m center dot K at 800 K. The SPS treatment appeared to reduce Sn vacancies, resulting in decreased carrier density, increased Seebeck coefficient (up to 60 mu V K-1 at 700 K), and nearly doubled weighted mobility compared to the as-grown sample.
Article
Crystallography
Joao Elias F. S. Rodrigues, Javier Gainza, Federico Serrano-Sanchez, Norbert M. Nemes, Oscar J. Dura, Jose Luis Martinez, Jose Antonio Alonso
Summary: A novel Eu-filled skutterudite has been synthesized under high-pressure conditions, and its structure was studied by high-resolution synchrotron X-ray diffraction. The thermal conductivity of this alloy was measured to be 0.82 W m(-1) K-1, lower than that of other filled skutterudites.
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Radjia Belguet, Nabil Mahamdioua, Faiza Meriche, Jose A. Alonso, Jose L. Martinez, Fatih Denbri, Sevgi Polat-Altintas, Cabir Terzioglu
Summary: Hole-doping double-layered manganites with the formula La1:0Gd(0.2-x)PbxCa1.2Sr0.6Mn2O7 (x = 0, 0.1, and 0.2) were prepared and characterized. The samples exhibited a tetragonal structure with an I4/mmm space group. Micrographs obtained using a scanning electron microscope showed a granular and porous structure with spherical grains. Fourier-transform infrared (FTIR) analysis confirmed the presence of characteristic vibrational bands. Electrical resistivity measurements revealed a decrease in resistivity with increasing Pb concentrations. The samples exhibited magnetic phase changes and displayed potential as temperature and magnetic sensors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Dmitry Galyamin, Jorge Torrero, Isabel Rodriguez, Manuel J. Kolb, Pilar Ferrer, Laura Pascual, Mohamed Abdel Salam, Diego Gianolio, Veronica Celorrio, Mohamed Mokhtar, Daniel Garcia Sanchez, Aldo Saul Gago, Kaspar Andreas Friedrich, Miguel A. Pena, Jose Antonio Alonso, Federico Calle-Vallejo, Maria Retuerto, Sergio Rojas
Summary: The study finds that low-ruthenium-content pyrochlores (R2MnRuO7, R = Y, Tb, and Dy) exhibit high activity and durability for the oxygen evolution reaction (OER) in acidic media. Among them, Y2MnRuO7 is the most stable catalyst, showing a voltage of 1.5 V at 10 mA cm(-2) for 40 h, or 5000 cycles up to 1.7 V. Experimental and computational results indicate that the excellent performance is attributed to the Ru sites embedded in RuMnOx surface layers. A water electrolyzer with Y2MnRuO7 and only 0.2 mgRu cm(-2) achieves a current density of 1 A cm(-2) at 1.75 V, remaining stable at 200 mA cm(-2) for over 24 h. These findings suggest further investigation on Ru catalysts with the goal of enhancing OER performance through a partial replacement of Ru with inexpensive cations. Ru-pyrochlores can serve as alternative anodes of PEM water electrolyzers, and their high performance is attributed to the Ru sites embedded in RuMnOx surface layers. The durability of a water electrolyzer with Y2MnRuO7 and only 0.2 mgRu cm(-2) has been successfully demonstrated.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jorge Torrero, Tobias Morawietz, Daniel Garcia Sanchez, Dmitry Galyamin, Maria Retuerto, Vlad Martin-Diaconescu, Sergio Rojas, Jose Antonio Alonso, Aldo Saul Gago, Kaspar Andreas Friedrich
Summary: In this study, an anode with reduced iridium loading (0.2 mg) compared to commercial proton exchange membrane water electrolysis (PEMWE) (2-3 mg) was developed, demonstrating high performance and stability for over 1000 hours. An advanced catalyst based on an Ir mixed oxide (Sr2CaIrO6) was used, which has an unconventional structure that contributes to the reduction of iridium in the catalyst layer. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed the reconfiguration of the ionomer in the catalyst layer, resulting in almost full coverage of the catalytic layer with ionomers.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Crisanto A. Garcia-Ramos, Kiril Krezhov, Maria T. Fernandez-Diaz, Jose A. Alonso
Summary: By using X-ray and neutron powder diffraction, magnetization measurements, and Fe-57 Mossbauer spectroscopy, the structural and magnetic properties of Sr1-xBaxFeO2F were investigated. The results showed the random occupancy of Sr and Ba atoms at the A-cation site and the statistical distribution of O and F at the anionic sublattice. The magnetic structure was determined to be a G-type antiferromagnetic arrangement with Fe3+ moments oriented along the c axis.
Article
Nanoscience & Nanotechnology
Carmen Abia, Carlos A. Lopez, Javier Gainza, Joao Elias F. S. Rodrigues, Brenda Fragoso, Mateus M. Ferrer, Maria Teresa Fernandez-Diaz, Francois Fauth, Jose Luis Martinez, Jose Antonio Alonso
Summary: This study focuses on the instability issue of hybrid CH3NH3PbI3 perovskite in photovoltaics. Cs4PbBr6-x I (x) crystals with excellent crystallinity were synthesized by mechanochemical procedures, and their crystal structure was investigated in detail using synchrotron X-ray powder diffraction. The vacancies of Cs and X ions were found to maintain the stability of the crystal structure through ion migration. Density functional theory simulations showed that the band gap of the material can be reduced by replacing Br with I within a certain range.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Carmen Abia, Carlos A. Lopez, Javier Gainza, Joao Elias F. S. Rodrigues, Brenda Fragoso, Mateus M. Ferrer, Norbert M. Nemes, Oscar J. Dura, Jose Luis Martinez, Maria Teresa Fernandez-Diaz, Jose Antonio Alonso
Summary: Rubidium di-tin pentabromide (RbSn2Br5) is a lead-free alternative material with high crystallinity that can be easily synthesized using a ball milling procedure. It has the potential to be used as a photovoltaic and optoelectronic material due to its improved stability and tolerance to ambient conditions. Experimental studies have shown that it has high electronic conductivity and Seebeck coefficient, as well as low thermal conductivity.
Article
Chemistry, Physical
Kaiyong Tuo, Chunwen Sun, C. A. Lopez, Maria Teresa Fernandez-Diaz, Jose Antonio Alonso
Summary: We report a new mixed-metal halide superionic conductor Li3-xY1-xHfxCl6 (0≤x<1) with high ionic conductivity up to 1.49 mS cm(-1) at room temperature. By using experimental characterization techniques and calculations, we investigate the influence of aliovalent substitution of Hf for Y on the local structural environment and lithium-ion transport in Li3YCl6. The presence of prevalent cation site disorder and defect structure as well as the synthetically optimized (Y/Hf)Cl-6 framework strongly enhances the transport properties.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Carmen Abia, Carlos A. Lopez, Javier Gainza, Joao Elias F. S. Rodrigues, Maria T. Fernandez-Diaz, Eva Cespedes, Jose Luis Martinez, Jose Antonio Alonso
Summary: The search for lead-free materials for optoelectronic applications is a current research focus in the field of environment-friendly energy transition. In this study, we investigated the substitution of toxic Pb2+ with Cu2+ in all-inorganic CsPbBr3 perovskite, and explored the CsCuBr3 halide with little previous research. A mechanically-synthesized CsCuBr3 specimen was obtained and characterized by calorimetric and structural analysis techniques. The results revealed a structural phase transition and the presence of magnetic coupling between Cu2+ spins.
Article
Chemistry, Physical
Javier Gainza, Orlando N. Guinazu, Eva Cespedes, Horacio Falcon, Jose Luis Martinez, Jose Antonio Alonso
Summary: In this study, MnIn2S4 polycrystalline samples with tunable degree of inversion were prepared using a rapid high-pressure synthetic method. The crystal structure refinement showed a positive correlation between the inversion degree and properties such as band gap and magnetic behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Nestor E. Massa, Leire del Campo, Vinh Ta Phuoc, Paula Kayser, Jose Antonio Alonso
Summary: This study investigates the zone center terahertz excitations of non-Jahn Teller distorted perovskites LaFeO3, PrFeO3, ErFeO3, and LuFeO3 under external magnetic fields. The results show that the low-energy excitations strongly depend on the size of the lanthanide ions and are affected by minute lattice displacements. This study provides insights into the mechanism and manipulation of magnetic states using phonons in these perovskites.