Self-assembled electrodes formed from TiO₂ nanoparticles and poly(vinyl sulfonic acid) (PVS) were prepared using the Layer-by-Layer (LbL) technique. The thickness of the 5-, 10-, 15-, and 20-bilayer films was 58 nm, 92 nm, 174 nm and 296 nm, respectively. The electrochemical and chromogenic properties of LbL films of TiO₂/PVS have been examined in an electrolytic solution of 0,5 M LiClO₄/propylene carbonate. It is noted the presence of two sites during the positive potential scan, which were attributed to ionic trapping effects. The absorbance change associated to oxidation of trapping TiO₂ sites is attributed to electronic transitions involving energy states in gap band, which are formed due to strong distortion of the Li_0.5TiO₂ sites. Using the Quadratic Logistic Equation (QLE), it was possible to analyze the electronic transfer as a function of the number of lithium ions intercalated into the LbL film. From the parameters obtained from the fitting, it was also possible to determine the amount of trapping sites produced during the insertion of lithium ions. The electrochemical impedance spectroscopy (EIS) data show the presence of diffusion and trapping sites. The diffusion coefficient of lithium ions changed from 1.2x10^-10 cm².s^-1 to 3.1x10^-11­­ cm².s^-1 during the discharge process. Finally, the trapping effects associated to the amount of TiO₂ nanoparticles are discussed.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/7704 must be provided.