Preparação e caracterização de pentóxido de vanádio mesoporoso e reações de intercalação / Synthesis and characterization of mesoporous vanadium pentoxide and intercalation reaction

AUTOR(ES)

Elidia Maria Guerra

DATA DE PUBLICAÇÃO

2007

RESUMO

Synthesis, characterization of vanadium pentoxide mesoporous and studies of properties of hybrids compound based on vanadium oxide xerogel and vanadium pentoxide mesoporous, intercalated with guest species have been the main of this thesis. The interest in those materials, that present a considerable structural and chemical modification, is due to the possibility to tailor specific properties and produce new materials to application in optic, catalysis, electronic displays and sensors. The hybrid compounds were obtained from intercalation reaction utilizing templates agent such cetylpyridinium chloride and polymerics species such polyethylene oxide and poly o-methoxyaniline into the oxide. The synthesis is simple and relatively fast, and those materials are obtained, in a maximum, 10 days, even though it is not necessary the monitoring during the preparation and dry. The experimental results show an increase of interplanar, as well as, electrochemical properties of composites presented a better stability after several cycles as compared to vanadium pentoxide xerogel, indicating an intercalation reaction. Another stage of this work was to obtain the mesoporous vanadium pentoxide. The presence of porous was confirmed by adsorption isothermal method. Afterwards, it was realized the intercalation reaction with the polyethylene oxide and poly o-methoxyaniline into the matrix. The intercalation reaction using polymers into the porous matrix resulted an increase of Li+ ions mobility as well as an increase of total charge during the redox reaction resulting a synergic effect. In this context, it can be state that, the method used showed extremely attractive due to its simple synthesis, as well as it has the possibility of obtain materials with potential application such electrochemical displays, batteries and chemical sensors.

ASSUNTO(S)

lithium batteries reação de intercalação cetylpyridinium chloride intercalation reaction baterias de lítio v2o5 mesoporous hybrid compound óxido de polietileno v2o5 xerogel v2o5 mesoporoso composto híbrido poliethylene oxide o-methoxyaniline cloreto de cetilpirdínio o-metoxianilina v2o5 xerogel

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