Affiliation:
1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
Abstract
AbstractThe extraction of double-layer capacitance (DLC) is proposed using the electrochemical impedance spectroscopy (EIS) technique. By the concept of the frequency-dependent DLC, the DLC of polyaniline (PANI)-coated platinum wire is separated from the total capacitance at different DC potentials. The high conducting oxidized PANI is less frequency dependent. The DLC at the frequency of 1 Hz is the same as that of separation from the faradic current by cyclic voltammetry technology, exhibiting S-shaped curve at different DC potential. The process of the oxidation of PANI during the electrochemical impedance measurement is similar to the diffusion control.
Subject
Mechanical Engineering,Mechanics of Materials,Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials