Filmes automontados de óxidos metálicos: eletrocromismo e armazenamento de energia / Self-Assembled films composed of transition metal oxides for electrochromism and charge storage

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Thin films of titanium dioxide (TiO2), poly(vinyl sulfonic acid) (PVS) and tungsten oxo-hydroxy (WOxHy) were prepared using the Layer-by-Layer (LbL) method, allowing for strict control of its thickness and nanoarchitecture. The properties of these films concerning lithium ion transport and storage were investigated, so that these materials can be applied in secondary batteries and electrochromic devices in the future. The films were characterized by atomic force microscopy (AFM), cyclic voltammetry (CV), chronoamperometry, galvanostatic intermittent titration technique (GITT), electrochemical impedance spectroscopy (EIS), and electronic spectroscopy. The films presented good chemical cyclability and reversibility regarding the Li+ insertion and deinsertion process. TiO2, TiO2/PVS, and TiO2/WOxHy films presented reversible charge about 254 mC.cm-3, 260 mC.cm-3, and 296 mC.cm-3, respectively, and coloration efficiency under 660 nm radiation of 30.9 cm2.C-1, 26.1 cm2.C-1, and 24.9 cm2.C-1, respectively. Finally, lithium ion diffusion coefficients can be determined and related with specific capacities and diffusion of coloring waves using the model proposed in this work.

ASSUNTO(S)

self-assembled films tio2. difusão iônica tio2. electrochromism eletrocromismo filmes automontados ionic diffusion

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