Influence of polyaniline on photoelectrochemical characterization of TiO2-PANI layers*

Thi Tot Pham, The Duyen Nguyen, Thi Mai Xuan, Thi Thanh Thuy Mai, Hai Yen Tran and Thi Binh Phan

Abstract

TiO₂-polyaniline (PANI) composites were prepared by thermal oxidation of titanium substrate combined with chemical polymerization of aniline. Their chemical structures were determined by infrared (IR) spectroscopy and x-ray analysis. Their morphological structures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Their electro- and photoelectrochmical properties were examined by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. The results showed that their photoelectrochemical behavior was better than that of TiO₂ electrode; among them the more PANI existed in composite the higher was the anodic photoelectrochemical current. It was also found that the composite has structure in the range of nanosize