Structural, morphological and electrochemical properties of long alkoxy-functionalized polythiophene and TiO2 nanocomposites
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High performance alkoxy-functionalized polythiophene (PM4EOT) and TiO2 nanocomposites were prepared via a facile in situ oxidative chemical polymerization of thiophene monomer. The morphology studied demonstrated that nanocomposites were of the core–shell structure with a particle size of approximately 30 nm and PM4EOT shell was of about 2–10 nm thickness. X-ray photoelectron spectroscopy (XPS) spectra proved that there was a new Ti–S interaction between the polymer and TiO2 surface. The supercapacitive behaviors of the nanocomposites investigated by cyclic voltammetry galvanostatic charge–discharge and AC impedance measurements demonstrated that the prepared PM4EOT/TiO2 nanocomposite [1:1 (weight ratio)] exhibits enhanced specific capacitance and cycling stability as compared to the two pristine components and various ratio contents. The specific capacitance of PM4EOT/TiO2 nanocomposite (1:1) was obtained up to 111 F/g at a current density of 0.5 A/g, which is much higher than that of the pure PM4EOT (45 F/g) and TiO2 (1.6 F/g). In addition, the energy density of 15.4 Wh kg−1 and the power density of 308 W kg−1 delivered by composite (1:1) capacitor were achieved at a current density of 0.5 A/g.
This work was supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 18KJB150021), the National Natural Science Foundation of China (Grant No. 51303084) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). The authors gratefully acknowledge the facilities from Jiangsu Key Lab for the Chemistry and Utilization of Agricultural and Forest Biomass.
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Conflict of interest
The authors declare that they have no conflict of interest.
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