Abstract:
p-Chloroaniline modified carbon nanotube film (
pca-CNT) was prepared by diazotization reaction of carbon nanotube (CNT) film. Poly(2, 5-dihydroxy-1, 4-benzoquinonyl sulfide) (PDBS) was grown uniformly on the the surface of
pca-CNT by
in situ polycondensation method. The obtained
pca-CNT@PDBS composite was used as flexible electrode later. The morphology and structure of composite was characterized by field scanning electron microscope (FE-SEM), field transmission electron microscope (TEM), energy dispersive spectrum (EDS), Fourier infrared spectrum (FI-IR) and photoelectron spectroscopy (XPS). The results indicated that PDBS was coated on the
pca-CNT film successfully. The electrochemical testing showed that the
pca-CNT@PDBS flexible electrode exhibited an area specific capacitance (
CA) of 108 mF/cm
2 at the current density of 1 mA/cm
2, higher than pure PDBS (65.6 mF/cm
2) and CNT-supported PDBS (CNT@PDBS, 83.2 mF/cm
2). With the
pca-CNT@PDBS and CNT@PDBS as flexible positive electrode respectively, CNT-supported poly(1, 5-diamino-anthraquinone) (CNT@PDDA) as flexible negative electrode, and crylic rubber cross-linked memberane/tetraethyl tetrafluorate acetonitrile electrolyte (ACM/Et
4NBF
4-AN) as the quasi-solid-state electrolyte, organic asymmetric supercapacitor were assembled at the same time. The electrochemical results showed that area specific capacitance of the as-assembled flexible organic asymmetric supercapacitor was 79.6 mF/cm
2 at the current density of 2 mA/cm
2 and its volumetric energy density was 1.63 mW·h/cm
3 at the power density of 63.5 mW/cm
3. The capacitance retention of CNT@PDBS//ACM/Et
4NBF
4-AN//CNT@PDAA organic asymmetric supercapacitor was about 30.5% after only 7 500 cycles, exhibiting bad cycle performance. After 8 000 charging-discharging cycles, specific capacitance retention of
pca-CNT@PDBS//ACM/Et
4NBF
4-AN//CNT@PDAA was 80.5%, presenting much better cycle performance.