Carbon nanofiber/poly(tetrahydro[1,4]dioxino[2,3-b]thieno[3,4-e][1,4]dioxine) binder-free composite redox-active electrode for electrochemical energy storage applications

RSC Advances Pub Date: 2017-08-25 DOI: 10.1039/C7RA05545E

Abstract

We report the preparation and supercapacitive properties of a novel composite electrode material based on carbon nanofiber (CNF) and poly(tetrahydro[1,4]dioxino[2,3-b]thieno[3,4-e][1,4]dioxine) (PTDTD) for electrochemical energy storage applications. The CNF/PTDTD composite electrode was directly prepared by electrodeposition of PTDTD on the CNF coated substrate without any binder or conductive additives. The symmetric solid-state supercapacitor device was assembled by using these CNF/PTDTD composite electrodes. In addition, CNF/CNF and CNF/poly(3,4-ethylenedioxythiophene) (PEDOT) symmetric supercapacitor devices were also fabricated to make a detailed performance comparison. The electrochemical characteristics of all supercapacitor devices were comprehensively evaluated by CV, GCD and EIS measurements. The CNF/PTDTD composite electrodes delivered a maximum specific capacitance of 332 F g?1, energy density of 166 W h kg?1, power density of 4.9 kW kg?1 and an excellent cycling stability with 89% capacitance retention after 12?500 cycles at 2 mA cm?2 current density while CNF/PEDOT electrodes were able to reach a specific capacitance of 254 F g?1, energy density of 128.8 W h kg?1 and power density of 5.45 kW kg?1 in those supercapacitor devices. These results confirmed that PTDTD has significant potential to be a good alternative redox-active material and CNF/PTDTD composite structure is a promising candidate for supercapacitor applications.

Graphical abstract: Carbon nanofiber/poly(tetrahydro[1,4]dioxino[2,3-b]thieno[3,4-e][1,4]dioxine) binder-free composite redox-active electrode for electrochemical energy storage applications
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