Multifunctional Porous Nanohybrid Based On Graphene-Like Tungsten Disulfide On Poly(3,4-Ethoxylenedioxythiophene) For Supercapacitor And Electrochemical Nanosensing Of Quercetin

A multifunctional porous nanohybrid was designed for supercapacitor and nanosensor for voltammetric detection of Chinese traditional herbal drug quercetin (Qu) extracted from lotus leaves using graphene-like tungsten disulfide (WS2) nanosheet onto a porous and conductive poly(3,4-ethoxylenedioxythiophene) (PEDOT). Conducting PEDOT with a rough, porous, irregular surface was synthesized by one-step electropolymerization of commercially available monomer in acetonitrile solution, then WS2/PEDOT was facilely obtained by drop-coating WS2 nanosheet dispersion onto the synthesized PEDOT. WS2/PEDOT porous nanohybrid displayed a high capacitance characteristic with specific capacitance of 70.64 F-g(-1) at a current density of 0.2 A-g(-1), good cycling stability with capacitance retention of 90.74% after 5000 cycles and excellent voltammetric responses for Qu in linear ranges from 1.5 x 10(-7) to 1 x 10(-4) mol l(-1) with a limit of detection (LOD) of 50 nM and sensitivity of 1.76 mu A mu m(-1) cm(-2) under the optimum operation conditions. The developed nanohybrid sensor was employed for the electrochemical detection of Qu in real sample with acceptable recoveries in comparison with high-performance liquid chromatography. This work will provide an experimental basis for nanosensing platform integrated with supercapacitor as self-powered electrochemical energy storage system in the near future. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.