caa a22 4500 463228189 CHVBK 20180405153233.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1588-8 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1588-8 Study on the reduction of highly porous TiO2 precursors and thin TiO2 layers by the FFC-Cambridge process [Elektronische Daten] [R. Centeno-Sánchez, Derek Fray, George Chen] Reduction of porous titanium oxide precursors by the FFC-Cambridge process is reported in this paper. Porous TiO2 precursors were prepared by mixing the powder with different concentrations of graphite and polyethylene as fugitive agents and sintered at 1,073K. The maximum porosity achieved before the mixture saturation was approximately 75%. After the electro-deoxidation by the FFC-Cambridge process, shrinkage of approximately 40% in volume and increase in porosity were observed, which might be due to atomic rearrangement, change of density and subsequent grain growth during reduction. The potential applied (below the decomposition potential of CaCl2) had a direct effect on the minimum level of oxygen achieved, which was approximately 3,000ppm for 48h at 3.00V and the same level at half the time (24h) when increasing potential to 3.15V. On the other hand, thin layers (300μm thickness) screen-printed on titanium foils showed shorter reduction time than that observed for thicker porous pellets. This led to the conclusion that cathode geometry (porosity and thickness of the pellet) might have an effect on the rate of reduction by increasing the surface area available and improving the mass diffusion of oxygen ions. Springer Science+Business Media, LLC, 2007 Centeno-Sánchez R. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK aut Fray Derek Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK aut Chen George School of Chemical, Environmental and Mining, University of Nottingham, Nottingham, UK aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7494-7501 0022-2461 42:17<7494 2007 42 10853 https://doi.org/10.1007/s10853-007-1588-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1588-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Centeno-Sánchez R. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK aut NATIONALLICENCE 700 1- Fray Derek Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK aut NATIONALLICENCE 700 1- Chen George School of Chemical, Environmental and Mining, University of Nottingham, Nottingham, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7494-7501 0022-2461 42:17<7494 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer