Article
Chemistry, Multidisciplinary
Guowei Weng, Kun Ouyang, Xuanhe Lin, Sisi Wen, Yisa Zhou, Song Lei, Jian Xue, Haihui Wang
Summary: In this research, an efficient in-situ exsolution strategy was proposed to enhance the H-2 permeability and CO2 stability of lanthanum tungstate-type membranes. By in-situ generating catalytic Pd nanoparticles, the H-2 permeation flux was increased by 3.5 times and the membrane showed outstanding long-term chemical stability in a CO2-containing atmosphere.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Vishal Sharma, Inderpal Singh, Sunil K. Arora, Florencio Sanchez, Fouran Singh, Shilpa Tripathi, S. N. Jha
Summary: We investigated the impact of Ag15+ (200 MeV) ion irradiation on the surface electronic structure of epitaxial LaNiO3 films on (100) oriented LaAlO3 substrates by analyzing La (4d to 4f) and Ni (3p to 3d) photoemission transitions. Results showed slight enhancement in the spectral features for La (4d to 4f) transitions, but no enhancement for Ni (3p to 3d) transitions in both pristine and irradiated samples. Changes in constant initial state (CIS) spectra for La (4d to 4f) transitions and the presence of surface states near the Fermi level in Ni (3p to 3d) transitions were observed, with different ion doses associated with oxygen vacancies. Interestingly, the density of states (DOS) at the Fermi level in Ni (3p to 3d) transition spectra increased systematically with the irradiation dose, and a correlation between DOS at the Fermi level and surface states was found. The highest dose sample exhibited surface states with the highest DOS at the Fermi level, indicating an upward shift of surface states with increasing irradiation dose.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Jyoti Ahlawat, Suman Pawaria, Preeti Redhu, Sajjan Dahiya, Anil Ohlan, Rajesh Punia, A. S. Maan
Summary: The electrical conductivity of Na2O substituted zinc borate glasses has been investigated, and the conduction mechanism has been determined. Depending on the glass composition, the AC conduction in the glasses varies. Electronic conduction and ionic conduction have been studied through impedance investigations. The calculated activation energy values are similar.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Electrochemistry
A. R. Gilev, E. A. Kiselev, K. S. Sukhanov, D. V. Korona, V. A. Cherepanov
Summary: La2NiO4+delta, LCNF0604, LSNF0604, LSNF0605 and LSNF0504 compounds were synthesized by the citrate-nitrate technique and their phase purity was confirmed by X-ray powder diffraction. Electrochemical impedance spectroscopy studies showed that the polarization resistance decreased in the temperature range of 600-800 degrees C in wet air, with the order of LCNF0604>La2NiO4+delta>LSNF0504>LSNF0604>LSNF0605. The low frequency process was found to contribute significantly to the polarization resistance of the studied cells.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Mehrzad Soleimany, M. H. Paydar, Shaorong Wang
Summary: The study found that NiO doping can improve the flash-sintering performance of the BZCY7 compound, reducing the onset temperature and enhancing sinterability. NiO doping leads to larger grain sizes without segregation or second-phase formation. Additionally, the conductivity and activation energy of NiO-doped samples were higher than undoped samples.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Jiayue Wang, Jing Yang, Alexander Karl Opitz, Dmitri Kalaev, Andreas Nenning, Ethan J. Crumlin, Jerzy T. Sadowski, Iradwikanari Waluyo, Adrian Hunt, Harry L. Tuller, Bilge Yildiz
Summary: Understanding the surface defect chemistry and its strain dependency is crucial in developing next-generation electrochemical devices. This study constructed the strain-dependent surface defect equilibria of mixed ionic-electronic conducting perovskite oxides and investigated the effect of strain on the reducibility of the surfaces. The findings were validated by first principles calculations and thermodynamic analyses, providing a quantitative determination of the surface defect chemistry.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Dmitriy M. Zakharov, Nikolay A. Zhuravlev, Tatiana A. Denisova, Alexander S. Belozerov, Anna Yu. Stroeva, Emma G. Vovkotrub, Andrei S. Farlenkov, Maxim V. Ananyev
Summary: The influence of strontium on methane activation over La1-xSrxScO3-alpha catalyst was investigated using a combination of methods at temperatures ranging from 673 to 973 K. It was found that methane activation occurs through four parallel channels, with the increase of strontium content significantly increasing catalytic activity. The stability of methane intermediates is closely related to surface defect structure, temperature and strontium content.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
E. Pikalova, N. Bogdanovich, A. Kolchugin, L. Ermakova, A. Khrustov, A. Farlenkov, D. Bronin
Summary: The methods to increase electrochemical activity and stability of air electrodes based on LNF and SDC have been developed. The optimized electrodes exhibit good electrode performance and low degradation rate, maintaining a low polarization resistance level even after long-term testing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Chemistry, Physical
Yue Huang, Ruiming Qiu, Wenchao Lian, Libin Lei, Tong Liu, Jihao Zhang, Yao Wang, Jianping Liu, Jin Huang, Fanglin Chen
Summary: This review summarizes five methods for determining the electrical conduction properties of mixed ionic-electronic conducting (MIEC) oxides and discusses their modifications considering electrode polarization and operation conditions. The application of these methods in assessing the conduction properties of triple ionic-electronic conducting (TIEC) oxides is highlighted, and the reliability and applicability of these methods are elaborated and compared.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Muhammad Bilal Hanif, Sajid Rauf, Michal Mosialek, Kashif Khan, Vilma Kavaliuk, Algimantas Kezionis, Tomas Salkus, Jacek Gurgul, Dmitry Medvedev, Malgorzata Zimowska, Dominika Madej, Martin Motola
Summary: This study prepared single-phase BaCe0.9-xMoxY0.1O3-delta electrolyte via sol-gel method and investigated its structure, composition, electrochemical performance, and thermal stability. The conductivity of the grain interior and boundaries between 127 and 727 degrees C was reported for the first time in SOFC studies.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Physics, Multidisciplinary
Y. Shen, J. Sears, G. Fabbris, J. Li, J. Pelliciari, I Jarrige, Xi He, I Bozovic, M. Mitrano, Junjie Zhang, J. F. Mitchell, A. S. Botana, V Bisogni, M. R. Norman, S. Johnston, M. P. M. Dean
Summary: The essential electronic properties of low valence nickelates have been debated, whether they have appreciable oxygen charge-transfer character or are in a distinct Mott-Hubbard regime. Using O K-edge resonant inelastic x-ray scattering (RIXS), this study resolved the question and found that the low valence nickelate possesses mixed charge-transfer-Mott-Hubbard character. Despite a similar Coulomb repulsion, the transition-metal-oxygen hopping is larger in the nickelate, leading to a significant superexchange interaction and hole occupation of ligand O orbitals.
Article
Chemistry, Applied
Evangeline Jafneel Nixon, Rajalakshmi Sakthivel, Zeid Abdullah ALOthman, Pattan-Siddappa Ganesh, Ren-Jei Chung
Summary: Contemporary food marketing focuses on flavor enhancers rather than the nutritional value of food. An electrochemical sensor was developed using a modified electrode made of La2NiO4 functionalized carbon nanofiber (f-CNF) for detecting vanillin in food samples. The sensor exhibited high sensitivity (0.2899 mu A center dot mu M-1 center dot cm(-2)) and low limit of detection (6 nM) through electrochemical analysis, making it a promising tool for vanillin detection in food.
Article
Materials Science, Multidisciplinary
Jing Zhou, Xin Lin, Chengmei Long, Yunping Li, Zetian Tao
Summary: By applying a triple conducting coating on the cathode, this study successfully enhanced the power density of solid oxide fuel cells and promoted the rates of oxygen adsorption and ion migration.
Article
Engineering, Chemical
Kiryl Zakharchuk, Aleksandr Bamburov, Eugene N. Naumovich, Miguel A. Vieira, Aleksey A. Yaremchenko
Summary: The study investigates the incorporation of silicon into Ruddlesden-Popper La2NiO4+delta mixed conducting ceramics to improve chemical compatibility with lanthanum silicate-based solid electrolytes. Results show that silicon additions lead to segregation of secondary phases and suppress both electrical conductivity and oxygen-ionic transport in the ceramics. The preferential reactivity of silica with lanthanum oxide suggests a potential to enhance compatibility between solid electrolytes and electrodes through surface modifications.
Article
Chemistry, Physical
Anandha M. Jothi, D. Vanitha, K. Sundaramahalingam, N. Nallamuthu
Summary: Biocompatible solid polymer blend electrolytes were prepared using cornstarch and polyvinylpyrrolidone (PVP) via solution casting technique. Incorporation of ammonium nitrate (NH4NO3) increased the conductivity, and further enhancement was achieved by adding ethylene glycol (EG).
Article
Chemistry, Multidisciplinary
Yao Zhao, John Kilner, Tatsumi Ishihara, Kazunari Yoshizawa, Aleksandar Staykov
Summary: In this study, the impact of the partial covalent character of cations on their ionic diffusivity in La1-xSrxGayMg1-yO3-delta perovskite was computationally determined using density functional theory. The results revealed that cations with stronger covalent character had lower diffusivity compared to cations with more ionic character. The migration pathway of B-site cations was found to be curved to maximize electronic interactions with surrounding oxide ions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Physical
Hany Fathy Heiba, Jay C. Bullen, Andreas Kafizas, Camille Petit, Stephen J. Skinner, Dominik Weiss
Summary: The study critically examined the factors affecting the experimental determination of reaction rates for the photocatalytic oxidation of arsenite (As(III)) using TiO2 under UV radiation. The key findings include the importance of proper handling of adsorption and depletion of As(III), the potential impact of the solution composition and the light source on the oxidation rates, and the low quantum yield of the As(III) oxidation reaction.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jia Guo, Rongsheng Cai, Eleonora Cali, George E. Wilson, Gwilherm Kerherve, Sarah J. Haigh, Stephen J. Skinner
Summary: A-site deficient double perovskite oxides are subjected to low-temperature reduction, resulting in the exsolution of nanoparticles. These nanoparticles exhibit diffusion-limited growth and consist of both nickel and ruthenium, making them rare bimetallic nanoparticles formed at such low temperatures. The reduced electrode layers show a significant decrease in area-specific resistance, indicating promising prospects for catalytic applications.
Article
Chemistry, Physical
Katherine Develos-Bagarinao, Ozden Celikbilek, Riyan A. Budiman, Gwilherm Kerherve, Sarah Fearn, Stephen J. Skinner, Haruo Kishimoto
Summary: Innovative electrode structures are actively researched for solid oxide cells (SOCs) to achieve superior performance and long-term stability. This study investigates the effects of deposition temperature and annealing on nanostructured LSC thin film electrodes, revealing the importance of surface and interface tuning for improved electrochemical performance and stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Editorial Material
Chemistry, Physical
Stephen J. Skinner, Viola Birss, Jennifer Rupp, Roger A. De Souza
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Ceramics
Duke P. C. Shih, Ainara Aguadero, Stephen J. Skinner
Summary: This study investigates the effect of A-site monovalent ions (K+ and Li+) on the electrical conductivity of NBT. The results show that partial replacement of Bi3+ with monovalent ions significantly improves the ionic conductivity, possibly due to an increase in oxygen vacancy concentration. The isotope exchange depth profile method confirms that oxygen ions are the main charge carriers.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Electrochemistry
V Thoreton, M. Niania, J. Druce, H. Tellez, J. A. Kilner
Summary: Measurements of oxygen diffusivity in ceramic samples of the mixed ionic electronic conductor La0.6Sr0.4Co0.2Fe0.8O3_(delta) (LSCF6428) revealed the presence of grain boundary tails in diffusion profiles at temperatures below 600 degrees C. Analysis of these tails provided values for the grain boundary diffusion products (D-gb delta). The activation enthalpies for both grain boundary and lattice diffusion were similar, indicating a common diffusion mechanism. Comparison with literature values showed that the D-gb delta values obtained for LSCF6428 were the highest recorded for any oxide material. The reasons for this high value, including nonstoichiometry of the lattice and the presence of twin boundaries, were discussed.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
George E. Wilson, Ieuan D. Seymour, Andrea Cavallaro, Stephen J. Skinner, Ainara Aguadero
Summary: The use of perovskite materials for thermochemical energy storage and oxygen separation has been gaining momentum due to their large oxygen exchange capacity and flexibility. This study investigates antimony-substituted strontium cobalt oxides as new materials for thermochemical oxygen separation. The results reveal exceptional redox kinetics and cyclability, with higher oxygen evolution and hindered reduction due to the inductive effect of antimony dopants. The identified material, SrCo0.95Sb0.05O3-delta, shows great potential for oxygen production under temperature-swing reaction configurations.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Nicholas J. Williams, Ieuan D. Seymour, Dimitrios Fraggedakis, Stephen J. Skinner
Summary: In this study, the activation losses at solid oxide fuel cell (SOFC) electrodes were investigated by simulating charge transfer using density functional theory (DFT). The electrostatic responses to the electric field were found to correlate with experimental data for different reduction reactions at mixed ionic-electronic conducting (MIEC) electrode surfaces. The study also highlighted the importance of decoupled ion-electron transfer and charged adsorbates on the performance of electrodes under nonequilibrium conditions. The findings have potential implications in energy storage and catalysis.
Article
Chemistry, Physical
Jonathan Cavazzani, Andrea Bedon, Giovanni Carollo, Mathilde Rieu, Jean-Paul Viricelle, Antonella Glisenti
Summary: In order to promote the market diffusion of solid oxide fuel cell (SOFC) devices, this study focuses on using fuels other than hydrogen and reducing the working temperature. The main efforts are concentrated on developing a sustainable multifuel anode using LSGF-based nanocomposites. Experiments and measurements were conducted to characterize the performance of the anode in hydrogen and propane. The results show promising power densities and increased open-circuit voltage in both fuels.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Zijie Sha, Gwilherm Kerherve, Matthijs A. van Spronsen, George E. Wilson, John A. Kilner, Georg Held, Stephen J. Skinner
Summary: A study investigated the surface reactions and composition of a mixed ionic and electronic conducting perovskite oxide. The results showed that the surface lattice oxygen is the significant redox active species, rather than the transition metal cations. The study also observed higher concentrations of surface oxygen vacancies and the formation of hydroxyl groups in water vapor. Furthermore, the study found that the concentration of Sr surface species increased over time in dry oxygen, while less Sr contents were observed in water vapor. The findings provide crucial understanding for the design and performance of electrocatalytic electrodes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Matthaeus Siebenhofer, Andreas Nenning, George E. Wilson, John A. Kilner, Christoph Rameshan, Markus Kubicek, Juergen Fleig, Peter Blaha
Summary: This study investigates the effects of sulphur adsorbates and other SOFC poisons on the electronic and ionic properties of an SrO-terminated LSC surface and its oxygen exchange kinetics. Experimental and computational methods were used to analyze the surface modifications caused by the adsorbates. The results show that sulphur adsorbates strongly deactivate the LSC surface and affect oxygen vacancy formation energies. The study also reveals a correlation between work function changes and redistributed charge with the acidity of the adsorbed oxide.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Zijie Sha, Zonghao Shen, Eleonora Cali, John A. A. Kilner, Stephen J. J. Skinner
Summary: The effect of operating conditions on the surface composition and evolution of a perovskite oxide, (La0.8Sr0.2)(0.95)Cr0.5Fe0.5O3-delta (LSCrF8255), was investigated. Different environments were used to analyze the perovskite materials' applications as electrodes in electrochemical energy conversion devices. A variety of surface characterization techniques were employed, and the results showed that the operating conditions had a significant impact on surface segregation and phase separation.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Nicholas J. Williams, Ieuan D. Seymour, Robert T. Leah, Aayan Banerjee, Subhasish Mukerjee, Stephen J. Skinner
Summary: Non-equilibrium thermodynamics describes the current-voltage characteristics of electrochemical devices. In this study, the activation overpotential for the metal/mixed ionic-electronic conducting composite electrodes originates at the interface between the material and gas. The driving force for coupled ion-electron transfer is held at the interface, and the rate of transfer scales with the availability of free sites on the metallic surface.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Juan F. Basbus, Mauricio D. Arce, Jose A. Alonso, Miguel A. Gonzalez, Gabriel J. Cuello, Maria T. Fernandez-Diaz, Zijie Sha, Stephen J. Skinner, Liliana Mogni, Adriana C. Serquis
Summary: Understanding the protonic defect transport mechanism in Ba(Ce,Zr)O-3 perovskite oxides and defining the appropriate temperature range are important for material design and application. Structural features, lattice distortions, and proton diffusion play key roles in protonic conduction.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
