Heterostructured poly(3,6-dithien-2-yl-9H-carbazol-9-yl acetic acid)/TiO2 nanoparticles composite redox-active materials as both anode and cathode for high-performance symmetric supercapacitor applications


YİĞİT D. , GÜLLÜ M., Yumak T., SINAĞ A.

Journal of Materials Chemistry A, vol.2, no.18, pp.6512-6524, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 2 Issue: 18
  • Publication Date: 2014
  • Doi Number: 10.1039/c4ta00109e
  • Title of Journal : Journal of Materials Chemistry A
  • Page Numbers: pp.6512-6524

Abstract

Herein, a facile and simple method is reported for preparation of composite electrode materials based on conducting polymer/nano metal oxide combination for supercapacitor applications. The heterostructured composite redox-active electrode materials, having both p- and n-doping ability, were fabricated using poly(3,6-dithien-2-yl-9H-carbazol-9-yl acetic acid) and nano sized TiO 2 particles without any binder and conducting additives. The heterostructured composite electrodes exhibited remarkable a specific capacitance (Cspec = 462.88 F g-1), specific power (SP = 266.96 kW kg-1), specific energy (SE = 89.98 W h kg-1), good cycling performance and excellent reversible capability (81.7% capacitance retention after 8000 charge/discharge cycles) at 2.5 mA cm-2 current density within a 1.2 V potential window with two-electrode symmetric cell configuration. Besides, heterostructured composite electrode materials were fabricated using different particle sized TiO2 (3-5 nm, average 21 nm and bulk), and the effect of the particle size on supercapacitor performances was investigated and compared in detail. Our symmetric pseudo-capacitor device lighted a LED for 4.7 min with 42 s charge time at 2.5 mA cm-2 even after 8000 charge/discharge cycles. This journal is © the Partner Organisations 2014.