Publications
547 results found
Wachsman E, Ishihara T, Kilner J, 2014, Low-temperature solid-oxide fuel cells, MRS BULLETIN, Vol: 39, Pages: 773-782, ISSN: 0883-7694
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- Citations: 109
Druce J, Simrick N, Ishihara T, et al., 2014, "Imaging" LEIS of micro-patterned solid oxide fuel cell electrodes, 21st International Conference on Ion Beam Analysis (IBA), Publisher: ELSEVIER SCIENCE BV, Pages: 261-265, ISSN: 0168-583X
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- Citations: 5
Tellez H, Aguadero A, Druce J, et al., 2014, New perspectives in the surface analysis of energy materials by combined time-of-flight secondary ion mass spectrometry (ToF-SIMS) and high sensitivity low-energy ion scattering (HS-LEIS), Journal of Analytical Atomic Spectrometry, Vol: 29, Pages: 1361-1370, ISSN: 0267-9477
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) and low-energy ion scattering (LEIS) are recently attracting great interest in energy materials research due to their capabilities in terms of surface sensitivity and specificity, spatial resolution and their ability to analyse the isotopic chemical composition. This work shows the synergy provided by this powerful combination to further our understanding of the surface chemistry and structure that ultimately determines the electrochemical performance in advanced electro-ceramic materials for energy storage and energy conversion applications. In particular, this novel approach has been applied to the analysis of (Li3xLa2/3−x□1/3−2x)TiO3 perovskite materials used as the electrolyte in lithium batteries and (La, Sr)2CoO4+δ epitaxial thin films used as oxygen electrodes in solid oxide fuel cells and solid oxide electrolysers. The analysis of these two promising materials requires the development and optimisation of new analytical approaches that take advantage of the recent instrumental developments in order to characterise the outermost and near-surfaces at the atomic scale.
Yang F, Chen Y, Cai Z, et al., 2014, High resolution electron microscopy characterization of (La<inf>0.5</inf>Sr<inf>0.5</inf>)<inf>2</inf>CoC<inf>4</inf> thin film cathode materials, Pages: 1912-1913, ISSN: 1431-9276
Bayliss RD, Cook SN, Kotsantonis S, et al., 2014, Oxygen Ion Diffusion and Surface Exchange Properties of the α- and δ-phases of Bi<sub>2</sub>O<sub>3</sub>, ADVANCED ENERGY MATERIALS, Vol: 4, ISSN: 1614-6832
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- Citations: 38
Cavallaro A, Harrington GF, Skinner SJ, et al., 2014, Controlling the surface termination of NdGaO3 (110): the role of the gas atmosphere, NANOSCALE, Vol: 6, Pages: 7263-7273, ISSN: 2040-3364
Bernuy-Lopez C, Manalastas W, Lopez del Amo JM, et al., 2014, Atmosphere controlled processing of ga-substituted garnets for high Li-Ion conductivity ceramics, Chemistry of Materials, Vol: 26, Pages: 3610-3617, ISSN: 0897-4756
Ga-substituted La3Zr2Li7O12 garnet is shown to be a promising Li-ion conducting electrolyte material. The strategy adopted in this study is the substitution of Li by Ga, thereby creating Li vacancies and enhancing the Li conductivity. Solid State Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) measurements have been used to identify the location of the substituted Ga in the structure and its effect on the Li distribution and mobility. In addition MAS NMR was used to follow the effect of protonation due to atmospheric moisture on the sintering behavior of these materials. In particular, it is shown that the Ga atoms are located in tetrahedral positions promoting the random distribution of lithium over the available sites, hence promoting an increase in the conductivity. Control of the sintering conditions by using a dry O2 atmosphere leads to the formation of dense ceramic materials and avoids the degradation process due to the exchange of Li+ by H+ from atmospheric moisture. Electrochemical Impedance Spectroscopy data show total conductivities as high as 1.3 and 2.2 mS cm–1 at 24 and 42 °C, respectively, which are among the highest Li ion conductivities reported for garnet-structured materials to date.
Reinle-Schmitt ML, Cancellieri C, Cavallaro A, et al., 2014, Chemistry and structure of homoepitaxial SrTiO3 films and their influence on oxide-heterostructure interfaces, Nanoscale, Vol: 6, Pages: 2598-2602, ISSN: 2040-3364
The properties of single-crystal SrTiO3 substrates and homoepitaxial SrTiO3 films grown by pulsed laser deposition have been compared, in order to understand the loss of interfacial conductivity when more than a critical thickness of nominally homoepitaxial SrTiO3 is inserted between a LaAlO3 film and a SrTiO3 substrate. In particular, the chemical composition and the structure of homoepitaxial SrTiO3 investigated by low-energy ion-scattering and surface X-ray diffraction show that for insulating heterointerfaces, a Sr-excess is present between the LaAlO3 and homoepitaxial SrTiO3. Furthermore, an increase in the out-of-plane lattice constant is observed in LaAlO3, indicating that the conductivity both with and without insertion of the SrTiO3 thin film originates from a Zener breakdown associated with the polar catastrophe. When more than a critical thickness of homoepitaxial SrTiO3 is inserted between LaAlO3 and SrTiO3, the electrons transferred by the electronic reconstruction are trapped by the formation of a Sr-rich secondary phase and Sr-vacancies. The migration of Sr towards the surface of homoepitaxial SrTiO3 and accompanying loss of interfacial conductivity can be delayed by reducing the Sr-content in the PLD target.
Burriel M, Wilkins S, Hill JP, et al., 2014, Absence of Ni on the outer surface of Sr doped La2NiO4 single crystals, Energy and Environmental Science, Vol: 7, Pages: 311-316, ISSN: 1754-5692
A combination of surface sensitive techniques was used to determine the surface structure and chemistry of La2−xSrxNiO4+δ. These measurements unequivocally showed that Ni is not present in the outermost atomic layer, suggesting that the accepted model with the B-site cations exposed to the environment is incorrect.
Kilner JA, Burriel M, 2014, Materials for Intermediate-Temperature Solid-Oxide Fuel Cells, ANNUAL REVIEW OF MATERIALS RESEARCH, VOL 44, Editors: Clarke, Publisher: ANNUAL REVIEWS, Pages: 365-393
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- Citations: 297
Druce J, Kilner JA, 2014, Improvement of Oxygen Surface Exchange Kinetics for CGO with Surface Treatment, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 161, Pages: F99-F104, ISSN: 0013-4651
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- Citations: 17
Bassat J-M, Burriel M, Wahyudi O, et al., 2013, Anisotropic Oxygen Diffusion Properties in Pr<sub>2</sub>NiO<sub>4+δ</sub> and Nd<sub>2</sub>NiO<sub>4+δ</sub> Single Crystals, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 117, Pages: 26466-26472, ISSN: 1932-7447
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- Citations: 75
Li M, Pietrowski MJ, De Souza RA, et al., 2013, A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3, NATURE MATERIALS, Vol: 13, Pages: 31-35, ISSN: 1476-1122
Ortiz-Vitoriano N, Ruiz de Larramendi I, Cook SN, et al., 2013, The Formation of Performance Enhancing Pseudo-Composites in the Highly Active La<sub>1-x</sub>Ca<sub>x</sub>Fe<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> System for IT-SOFC Application, ADVANCED FUNCTIONAL MATERIALS, Vol: 23, Pages: 5131-5139, ISSN: 1616-301X
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- Citations: 38
Stender D, Cook S, Kilner JA, et al., 2013, SIMS of thin films grown by pulsed laser deposition on isotopically labeled substrates, SOLID STATE IONICS, Vol: 249, Pages: 56-62, ISSN: 0167-2738
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- Citations: 8
Slodczyk A, Zaafrani O, Sharp MD, et al., 2013, Testing the Chemical/Structural Stability of Proton Conducting Perovskite Ceramic Membranes by in Situ/ex Situ Autoclave Raman Microscopy., Membranes (Basel), Vol: 3, Pages: 311-330, ISSN: 2077-0375
Ceramics, which exhibit high proton conductivity at moderate temperatures, are studied as electrolyte membranes or electrode components of fuel cells, electrolysers or CO2 converters. In severe operating conditions (high gas pressure/high temperature), the chemical activity towards potentially reactive atmospheres (water, CO2, etc.) is enhanced. This can lead to mechanical, chemical, and structural instability of the membranes and premature efficiency loss. Since the lifetime duration of a device determines its economical interest, stability/aging tests are essential. Consequently, we have developed autoclaves equipped with a sapphire window, allowing in situ Raman study in the 25-620 °C temperature region under 1-50 bar of water vapor/gas pressure, both with and without the application of an electric field. Taking examples of four widely investigated perovskites (BaZr0.9Yb0.1O3-δ, SrZr0.9Yb0.1O3-δ, BaZr0.25In0.75O3-δ, BaCe0.5Zr0.3Y0.16Zn0.04O3-δ), we demonstrate the high potential of our unique set-up to discriminate between good/stable and instable electrolytes as well as the ability to detect and monitor in situ: (i) the sample surface reaction with surrounding atmospheres and the formation of crystalline or amorphous secondary phases (carbonates, hydroxides, hydrates, etc.); and (ii) the structural modifications as a function of operating conditions. The results of these studies allow us to compare quantitatively the chemical stability versus water (corrosion rate from ~150 µm/day to less than 0.25 µm/day under 200-500 °C/15-80 bar PH2O) and to go further in comprehension of the aging mechanism of the membrane.
Cooper SJ, Kishimoto M, Tariq F, et al., 2013, Microstructural Analysis of an LSCF Cathode Using In Situ Tomography and Simulation, ECS Transactions, Vol: 57, Pages: 2671-2678, ISSN: 1938-6737
Electrode tortuosity factor is a key input parameter in many fuel cell simulations. Three-dimensional microstructural data obtained from in-situ synchrotron X-ray nano-computed tomography is used as the basis for comparing five approaches to quantify the tortuosity factor. Three of these techniques are based on diffusivity simulations and showed strong correlation, but had consistently different absolute values. A random walk method showed a good degree of correlation to the diffusive approaches, but had the largest values overall. Lastly, a calculation that used a mean pore centroid approach showed little correlation to any of the other three methods, but compared well with the conventional Bruggeman correlation. Due to the diffusive nature of the ionic transport in electrodes, the authors would recommend calculating tortuosity factors using a diffusive approach based on the voxels rather than a remeshed volume.
Sayers R, Schiffman F, Fearn S, et al., 2013, Internal activation strain and oxygen mobility in a thermally stable layered Fe3+ oxide, Chemistry of Materials
Chen Y-C, Yashima M, Pena-Martinez J, et al., 2013, Experimental Visualization of the Diffusional Pathway of Oxide Ions in a Layered Perovskite-type Cobaltite PrBaCo<sub>2</sub>O<sub>5+δ</sub>, CHEMISTRY OF MATERIALS, Vol: 25, Pages: 2638-2641, ISSN: 0897-4756
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- Citations: 58
Rushton MJD, Chroneos A, Skinner SJ, et al., 2013, Effect of strain on the oxygen diffusion in yttria and gadolinia co-doped ceria, SOLID STATE IONICS, Vol: 230, Pages: 37-42, ISSN: 0167-2738
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- Citations: 104
Hyodo J, Ida S, Kilner JA, et al., 2013, Electronic and oxide ion conductivity in Pr<sub>2</sub>Ni<sub>0.71</sub>Cu<sub>0.24</sub>Ga<sub>0.05</sub>O<sub>4</sub>/Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>2</sub> laminated film, SOLID STATE IONICS, Vol: 230, Pages: 16-20, ISSN: 0167-2738
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- Citations: 15
Skinner SJ, Cook S, Kilner JA, 2013, Materials for next generation SOFCs, Green Energy and Technology, Vol: 55, Pages: 181-201, ISSN: 1865-3529
New materials are constantly identified as potential components of next generation energy technologies. Significantly, new engineering solutions have also been proposed that will enhance the performance of both these new and also existing materials. Here the latest developments in both materials and device engineering are summarised focusing on the potential for enhanced ionic mobility achieved through engineered structures utilising thin film deposition technologies. In the second section of this work the promise of new materials will be discussed, considering the layered and double perovskite structure types as next generation electrodes. © Springer-Verlag London 2013.
Kreller CR, McDonald TJ, Adler SB, et al., 2013, Origin of Enhanced Chemical Capacitance in La<sub>0.8</sub>Sr<sub>0.2</sub>CoO<sub>3-δ</sub> Thin Film Electrodes, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 160, Pages: F931-F942, ISSN: 0013-4651
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- Citations: 18
Lomberg M, Ruiz-Trejo E, Offer G, et al., 2013, Characterization of a Novel Ni-impregnated GDC Electrode for Solid Oxide Fuel Cell and Electrolysis Cell Applications, SOLID OXIDE FUEL CELLS 13 (SOFC-XIII), Vol: 57, Pages: 1349-1357, ISSN: 1938-5862
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- Citations: 6
Shiiba H, Bishop CL, Rushton MJD, et al., 2013, Effect of A-site cation disorder on oxygen diffusion in perovskite-type Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>1-<i>x</i></sub>Fe<i><sub>x</sub></i>O<sub>2.5</sub>, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 10345-10352, ISSN: 2050-7488
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- Citations: 22
Lee S-N, Atkinson A, Kilner JA, 2013, Effect of Chromium on La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> Solid Oxide Fuel Cell Cathodes, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 160, Pages: F629-F635, ISSN: 0013-4651
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- Citations: 34
Zapata J, Burriel M, Garcia P, et al., 2013, Anisotropic <SUP>18</SUP>O tracer diffusion in epitaxial films of GdBaCo<sub>2</sub>O<sub>5+δ</sub> cathode material with different orientations, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 7408-7414, ISSN: 2050-7488
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- Citations: 29
Shiiba H, Nakayama M, Kasuga T, et al., 2013, Calculation of arrangement of oxygen ions and vacancies in double perovskite GdBaCo<sub>2</sub>O<sub>5+δ</sub> by first-principles DFT with Monte Carlo simulations, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 15, Pages: 10494-10499, ISSN: 1463-9076
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- Citations: 18
Marrocchelli D, Bishop SR, Kilner J, 2013, Chemical expansion and its dependence on the host cation radius, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 1, Pages: 7673-7680, ISSN: 2050-7488
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- Citations: 45
Bishop SR, Druce J, Kilner J, et al., 2013, Compensation for Oxygen Exchange Rate Limiting Impurities on a Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2-δ</sub> SOFC Electrode Material, SOLID OXIDE FUEL CELLS 13 (SOFC-XIII), Vol: 57, Pages: 2003-2007, ISSN: 1938-5862
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- Citations: 4
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