We report the synthesis of multiwall carbon nanotubes@metal oxide composites (MWCNT@Sn 1-x Ti x O 2 ) and explore the lithium storage capacity and mechanisms in a broad range of compositions. The composite structures were synthesized by hydrothermal method using SnCl 4 and TiCl 4 as Sn and Ti sources, respectively. Oxide adherence on the carbon surface, as well as an optimum ratio between surface area and porosity, seem to be promoted by Sn content, with MWCNT@Sn 0.75 Ti 0.25 O 2 showing the best performance in terms of Li capacity and structure stability. Cycled in a potential range of 3 to 1 V vs Li/ Li + , the composite shows an insertion mechanism reported for solid solutions with low Sn content, whereas at cut off potential of 0 V vs Li/Li + the alloying mechanism expected for SnO 2 is dominant. Nevertheless, the presence of Ti during the transformation of the solid solution impacts positivily the performance of these electrodes.[a] M. Ramírez-Vargas, Dr. M. S. de la Fuente, Dr.
Electron lifetime and photoelectrochemical performance of carbon-doped TiO 2 electrodes are presented. Thin films of random disposed ribbon-like structures of C-doped TiO 2 were applied onto FTO substrates using spray and dip-coating techniques. The fabricated electrodes show photocurrent enhancement 20 times greater than compact TiO 2 electrode, and electron lifetimes 2 orders of magnitude lower than compact TiO 2 films. Enhancement in photocurrent suggests a beneficial role of C-doping which compensates the transport properties expected to deteriorate in disordered and thicker architectures. Due to its large surface area, C-doped TiO 2 electrodes can be used as matrix for the deposition of QD sensitizers for photovoltaic applications or as photoanode for photocatalytic applications. Still optimization on film thickness and passivation strategies must be implemented to increase the carrier lifetime.
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