The enhanced performance of TiO2 nanoparticle supercapacitor via electrochemical post-processing
HE Min1,2， HUANG Qiuan2， CAI Yuan1,2， YANG Changping1
1.School of Physics and Electronic Science， Hubei University， Wuhan 430062；2.School of Computer Science and Information Engineering， Hubei University， Wuhan 430062
Abstract：In this paper work， TiO2 nanoparticles were prepared by hydrothermal method using titanium sulfate as titanium source， and then the samples were made into electrode simulation supercapacitors. 1) The microstructure of TiO2 nanoparticles was observed by SEM， and the diameter of TiO2 nanoparticles was 30～50 nm. The crystal structure of TiO2 nanoparticles was anatase confirmed by XRD； 2) the supercapacitor is subjected to an electrical cycle process with an increase of specific capacitance from 10 mF / cm2 to a stable value of 103 mF/cm2， which suggests that the conductivity of the sample was significantly improved by the electric cycle treatment； 3) a pair of obvious redox peaks was observed in the CV curve， and the specific capacitance of supercapacitor mainly originate from the corresponding redox reaction. The specific capacitance values are in agreement with each other， calculated by CV curve and the constant current charge/discharge curve， respectively. In addition， the polarization resistance due to Redox reaction was demonstrated by the measured impedance spectra for the fabricated nanoparticle supercapacitor.
2017, Vol. 51 
