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  • 51.
    Kasemägi, H
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Klintenberg, M
    Aabloo, A
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Molecular dynamics simulation of temperature and concentration dependence of the2003In: Electrochimica Acta, no 48, p. 2273-2278Article in journal (Refereed)
  • 52.
    Kasemägi, H.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Klintenberg, M.
    Aabloo, A.
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Molecular dynamics simulation of the LiBF4-PEO system containing an A12O3 nanoparticle.2002In: Solid State Ionics, Vol. 147, p. 367-Article in journal (Refereed)
  • 53.
    Kasemägi, Heiki
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Klintenberg, M
    Aabloo, A
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Molecular dynamics simulation of the effect of adding an A12O3 nanoparticle to the PEO-LiCl/LiBr/Lil systems.2001In: J. Mater. Chem., Vol. 11, p. 3191-Article in journal (Refereed)
  • 54. Klintenberg, M
    et al.
    Weber, M.J.
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Gustafsson, Torbjörn
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Derenzo, S.E.
    Lu2SiO5 by single-crystal X-ray and neutron diffraction.2001In: Acta Cryst., Vol. C57, p. 668-Article in journal (Refereed)
  • 55. LAMPE ÖNNERUD, C
    et al.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    MECHANISMS FOR THE THERMAL-DECOMPOSITION OF NH4VO3 INTO V6O13, V3O7 AND V2O51995In: Royal Soc. Chemistry, Vol. 5, no 7, p. 1075-1080Article in journal (Refereed)
    Abstract [en]

    The thermal decomposition of ammonium metavanadate, NH4VO3, has been studied by differential scanning calorimetry (DSC), mass spectrometry (MS) and X-ray diffraction (XRD) in the temperature range 50-500 degrees C. Different experimental conditions (heat

  • 56. LAMPE ÖNNERUD, C
    et al.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    THE SYNTHESIS OF SINGLE-PHASE V6O13 AND VO21995In: EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY, Vol. 32, no 4, p. 293-302Article in journal (Other scientific)
    Abstract [en]

    The synthesis of single-phase V6O13 and VO2 is described. The method involves thermal decomposition of NH4VO3 at 0.5 degrees C/min from 50 to 500 degrees C in a specially designed reaction chamber. The synthesis of V6O13 requires a controlled maximum pre

  • 57. LAMPE ÖNNERUD, C
    et al.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    HARDGRAVE, M
    YDEANDERSEN, S
    THE PERFORMANCE OF SINGLE-PHASE V6O13 IN THE LITHIUM POLYMER ELECTROLYTE BATTERY1995In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol. 142, no 11, p. 3648-3651Article in journal (Refereed)
    Abstract [en]

    Three different V6O13-based cathodes have been incorporated into thin-film polymer electrolyte cells: single-phase V6O13, and V6O13 containing 10 molar percent (m/o) VO2 or V2O5. In situ x-ray diffraction (XRD) reveals four phases, identified as Li0.5V6O

  • 58.
    LAMPE-ÖNNERUD, C
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    NORDBLAD, P
    Technology, Department of Materials Science. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    CHEMICAL INTERCALATION OF LITHIUM INTO A V6O13 HOST1995In: SOLID STATE IONICS, ISSN 0167-2738, Vol. 81, no 3-4, p. 189-199Article in journal (Refereed)
    Abstract [en]

    Chemical lithium insertion into five different types of V6O13-based intercalation hosts have been performed in this study. Four phases were identified: Li-0.56,O-13, Li1.5V6O13, Li1.5V6O13 and Li6V6O13; the latter phase representing the highest degree of

  • 59.
    Liivat, Anti
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Aabloo, Alvo
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Development of a force field for Li2SiF62005In: Journal of Computational Chemistry, Vol. 26, no 7, p. 716-724Article in journal (Refereed)
    Abstract [en]

    A force field has been developed for Li2SiF6 for subsequent use in Molecular Dynamics (MD) simulations involving Li+ and SiF ions in a polymer electrolyte host. Both ab initio calculations and available empirical data have been used. The force field has been verified in simulations of the crystal structure of Li2SiF6 in two different space groups: P321 and Pm1. The use of MD simulation to assess the correct space group for Li2SiF6 shows that it is probably P321.

  • 60.
    Liivat, Anti
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Brandell, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Thomas, Josh
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    A molecular dynamics study of ion-conduction mechanisms in crystalline low-Mw LiPF6·PEO62007In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 17, no 37, p. 3938-3946Article in journal (Refereed)
    Abstract [en]

    Molecular dynamics (MD) simulation has been used to probe ion-conduction mechanisms in crystalline LiPF6.PEO6 for smectic- and nematic-ordered models of methyl-terminated short-chain monodisperse poly(ethylene oxide) chains with the formula CH3-(OCH2CH2)23-OCH3; Mw = 1059. The effect of aliovalent substitution of the PF6- anion by ca. 1% SiF62- has also been studied. External electric fields in the range 3-6 x 106 V m-1 have been imposed along, and perpendicular to, the chain direction in an effort to promote ion transport during the short timespan of the simulation. Ion-migration barriers along the polymer channel are lower for the nematic models than for the smectic, with anions migrating along the channels more readily than Li-ions. Ion mobility within the smectic interface could also be confirmed, but at a higher field-strength threshold than along the chain direction. Li-ion migration within the smectic plane appears to be suppressed by ion pairing, while Li-ion transport across the smectic gap is facilitated by uncoordinated methoxy end-groups. Interstitial Li-ions introduced into the PEO channel through SiF62- doping are also shown to enhance Li-ion conduction.

  • 61.
    Liivat, Anti
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Thomas, John O.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    A DFT study of VO43- polyanion substitution into the Li-ion battery cathode material Li2FeSiO42010In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 50, no 1, p. 191-197Article in journal (Refereed)
    Abstract [en]

    Density Functional Theory (DFT) has here been used to study the substitution of SiO44- for VO43- polyanions in the orthosilicate Li-ion battery cathode material Li2FeSiO4, in order to enhance electron transfer between the TM-ions and thereby achieve a capacity increase from the potential redox activity of the orthovanadate polyanion. Comparison of results for five different model structures for LiFeXO4, X = Si, P and V, reveals that VO43- substitution destabilizes the tetrahedral structures towards olivine- or spinel-type structures. Our modelling of lithiation of the hypothetical 100% substituted system LiFeVO4 to Li2FeVO4 predicts the reduction of V5+ in the VO43- anion to V4+ at a potential of 2.1 V. While complete delithiation of LiFeVO4 to FeVO4 is accompanied by Fe2+/Fe3+ oxidation at similar to 3.1 V. These lithiation and delithiation processes trigger changes in the unit-cell volume: -6% and +10%, respectively. Notably, only minor structural distortions were observed in both VO43- and the more exotic VO44- tetrahedra. Thermodynamically feasible VO43- substitution levels are also shown to be <30%. This is exemplified for a 12.5% VO4-substituted system which exhibits similar to 50% smaller band-gap and increased capacity at an average deintercalation potential of similar to 3.2 V compared to the un-substituted system.

  • 62.
    Liivat, Anti
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Thomas, Josh
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Minerals as a source of novel Li-ion battery electrode materials2015In: Macedonian Journal of Chemistry and Chemical Engineering, ISSN 1857-5552, E-ISSN 1857-5625, Vol. 34, no 1, p. 145-149Article in journal (Refereed)
    Abstract [en]

    As a tribute to the major contribution made by Academician Gligor Jovanovski to the field of Mineralogy in Macedonia, this paper promotes the potential role that minerals can have as a future source of inspiration in identifying novel materials for sustainable energy storage in general, and for advanced Li-ion batteries in particular. We exemplify this by indicating the innovative use of polyanions in novel Li-ion battery cathode materials such as the olivine lithium iron phosphate (LiFePO4), and in an even newer material - the orthosilicate lithium iron silicate (Li2FeSiO4). Both materials have strong intrinsic links to mineralogy and - illustrate well how mineralogy can lead to new material breakthroughs in this and other areas of modern technology.

  • 63.
    Liivat, Anti
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Thomas, Josh
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Guo, Jianghuai
    Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China..
    Yang, Yong
    Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China..
    Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO42017In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 223, p. 109-114Article in journal (Refereed)
    Abstract [en]

    A highly reactive composite cathode material incorporating nano-particles of the popular Li-ion battery cathode material Li2FeSiO4 (LFS) is here studied to probe the activation of the controversial Fe3+/Fe4+ redox couple in exploiting the second Li-ion in the formula unit - for use in rechargeable Li-ion batteries. A novel form of in situ Mossbauer spectroscopy is used to monitor the oxidation state of the Fe-ions in symmetric LFS LFS cells. This is based on mapping the poorly resolvable Mossbauer spectra from the expected Fe3+/Fe4+ redox couple in the working electrode onto the highly resolvable Fe2+/Fe3+ spectra from the counter electrode. Comparison of such data from half-delithiated Li(1)Fe3+SiO4 parallel to Li(1)Fe3+SiO4 and almost lithium-free "Li(0)Fe4+SiO4 parallel to Li(0)Fe4+SiO4" symmetric cells is demonstrated - to distinguish the electrode reactions from the those involving the electrolyte. Lithium is shown to cycle reversibly in the symmetric cells. However, a large proportion of the cycled lithium (similar to 70%) does not derive from the bulk of the electrodes, but is rather a result of high-V electrolyte degradation, where charge balance is maintained by leaching lithium from the electrolyte and inserting it into the electrodes.

  • 64. NEYERTZ, S
    et al.
    BROWN, D
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    MOLECULAR-DYNAMICS SIMULATION OF THE CRYSTALLINE PHASE OF POLY(ETHYLENE OXIDE)-SODIUM IODIDE, PEO(3)NAI1995In: ELECTROCHIMICA ACTA, Vol. 40, no 13-14, p. 2063-2069Article in journal (Refereed)
    Abstract [en]

    The polymer-polymer interaction potential used in an earlier reported MD simulation of crystalline PEO [Neyertz, Brown and Thomas, J. Chem. Phys., 101, 10064 (1994)] is here transferred to the crystalline phase of poly(ethylene oxide)-sodium iodide, PEO(

  • 65. NEYERTZ, S
    et al.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    BROWN, D
    MOLECULAR-DYNAMICS SIMULATIONS OF THE AMORPHOUS POLYMER ELECTROLYTE PEO(X)NAL1995In: COMPUTATIONAL POLYMER SCIENCE, Vol. 5, no 3, p. 107-120Article in journal (Refereed)
    Abstract [en]

    Poly(ethylene oxide)-based electrolytes are ionically conducting systems formed by dissolving salts in an amorphous PEO matrix. Molecular dynamics (MD) simulations are promising as a source of otherwise elusive information on the local environment and mo

  • 66.
    Nytén, Anton
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Abouimrane, Ali
    Armand, Michel
    Gustafsson, Torbjörn
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Thomas, John O.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Electrochemical performance of Li2FeSiO4 as a new Li-battery cathode material2005In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 7, no 2, p. 156-160Article in journal (Refereed)
    Abstract [en]

    Phase-pure lithium iron silicate (Li2FeSiO4) has been prepared successfully. Its ambient temperature structure has been determined by X-ray diffraction and its electrochemical performance characterised at 60 °C. The resulting cyclic voltammogram suggests a phase transition to a more stable structure after the first cycle. This could involve a structural ordering process from a solid-solution to a long-range-ordered structure. The initial charge capacity of 165 mAh/g (99% of the theoretical value) stabilises after a few cycles to around 140 mAh/g (84% of the theoretical value).

  • 67.
    Nytén, Anton
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Thomas, John
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    A neutron powder diffraction study of LiCoxFe1−xPO4 for x = 0, 0.25, 0.40, 0.60 and 0.752006In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 177, no 15-16, p. 1327-1330Article in journal (Refereed)
    Abstract [en]

    X-ray and neutron powder diffraction studies have been made of the single-phase systems LiCoxFe1−xPO4 (x = 0, 0.25, 0.40, 0.60 and 0.75) to establish how Co2+ substitutes into the LiFePO4 olivine structure. Rietveld refinement shows that all four substituted materials have the same olivine structure (space group: Pnma) with lithium occupying octahedral (4a) sites, and Co2+ replacing Fe2+ at the octahedral (4c) sites. The a and b cell parameters decrease while the c parameter increases on the addition of Co2+. There are certain indications of structural instability for high Co-content compositions.

  • 68. Sudworth, J.L.
    et al.
    Barrow, P
    Dong, W
    Dunn, B
    Farrington, G.C.
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Towards commercialization of the beta-alumina family of ionic conductors.2000In: MRS Bulletin, Vol. 25, p. 22-Article in journal (Refereed)
  • 69. Sörby, L
    et al.
    Poulsen, F W
    Friis Poulsen, H
    Garbe, S
    Thomas, J O
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry.
    An in situ diffraction study of a solid oxide fuel cell system1998In: European Powder Diffraction: 5, 1998, p. 408-413Conference paper (Refereed)
  • 70.
    Thackeray, M.M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Whittingham, M.S
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Science and applications of mixed conductors for lithium batteries.2000In: MRS Bulletin, Vol. 25, p. 39-Article in journal (Refereed)
  • 71.
    Thomas, John
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    REFINEMENT STRATEGY IN STRUCTURAL STUDIES OF CRYSTALLINE SOLID PROTON CONDUCTORS1995In: SOLID STATE IONICS, Vol. 77, p. 275-279Article in journal (Refereed)
    Abstract [en]

    The strategy applied in the structure refinement of accurate single-crystal neutron diffraction data for pseudo-centrosymmetric proton conducting systems can often be decisive. The application of a combination of judicious symmetry constraints and symmet

  • 72.
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    A spectacularly reactive cathode2003In: Nature materials, Vol. 2, no November, p. 705-706Article in journal (Refereed)
  • 73.
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Selected Papers from the 12th International Conference on Solid State Proton Conductors (SSPC-12)2005Chapter in book (Refereed)
  • 74.
    Tucker, Michael
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Odgaard, Madeleine
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Lund, Peter
    Yde-Andersen, Steen
    Thomas, John Oswald
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    The Pore Structure of Direct Methanol Fuel Cell Electrodes2005In: Journal of the Electrochemical Society, Vol. 152, no 9, p. A1844-A1850Article in journal (Refereed)
    Abstract [en]

    The pore structure and morphology of direct methanol fuel cell electrodes are characterized using mercury intrusion porosimetry and scanning electron microscopy. It is found that the pore size distributions of printed primer and catalyst layers are largely dictated by the powders used to make the printing ink. The extent to which the pore structure is modified by changing several parameters in the membrane electrode assembly (MEA) manufacturing process is discussed. The pore structure of the printed layers is found to be invariant with respect to changes in powder loading or in choice of printing substrate, and is relatively undisturbed by MEA hot-pressing. Changing the source of the primer powder and adding a pore-forming agent to the catalyst ink are found to be successful methods of creating a more open pore structure in the printed layers.

  • 75. Vullum, Fride
    et al.
    Teeters, Dale
    Nytén, Anton
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Thomas, John Thomas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Characterization of lithium nanobatteries and lithium battery nanoelectrode arrays that benefit from nanostructure and molecular self-assembly2006In: Solid State Ionics, Vol. 177, no 26-32, p. 2833-2838Article in journal (Refereed)
    Abstract [en]

    Arrays of functioning nanobatteries were constructed by using nanoporous aluminum oxide membranes and sol–gel technology. These battery arrays had performance benefits derived from the nanoscale assembly and nanoscale structure of the various components. V2O5 ambigel used to make the nanobatteries was characterized by X-ray diffraction and found to be slightly crystalline in the bulk state, but it was completely amorphous when confined in the pores of aluminum oxide filter membranes. The gel confined in the pores served as cathodes for individual nanobatteries. PEO wax electrolyte was also confined in the pores and then coupled with a lithium metal anode. An a.c. impedance analysis indicated that there was little or no unstable passivation of the lithium anode in contact with the PEO wax electrolyte. This was attributed to a self-assembly process of a hydrocarbon layer at the surface of the wax preventing unwanted chemical reactions of the lithium with the electrolyte. Individual nanobatteries in the arrays were then characterized by charge/discharge tests using the cantilever tip of an atomic force microscope to make electrical contact with the 200 nm cathodes of the nanobatteries. Average volumetric capacities of these cells were found to be in the range of 23–30 μA h/cm2 μm, which is higher than similar systems found in the literature and can be attributed to the nanostructure of these systems.

12 51 - 75 of 75
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