A novel electrode material based on a highly homogeneous polyaniline/titanium oxide hybrid for high-rate electrochemical capacitors

Abstract

A highly homogeneous polyaniline/titanium oxide hybrid, which contains approximately 75% polyaniline by mass, has been prepared by the oxidative polymerization of aniline with the simultaneous hydrolysis of Ti(SO₄)₂. As an electrode material for electrochemical capacitors, its initial specific capacitance is about 495 F g⁻¹ within the potential window −0.2 to 0.7 V vs. SCE at a constant current density of 2.5 A g⁻¹, and its capacitance retention ratio reaches circa 70% with the growth of current densities from 0.5 A g⁻¹ to 30 A g⁻¹. It is promising for high-rate electrochemical capacitive energy storage.