Abstract
A novel poly(3,4-ethylenedioxythiophene)-reduced graphene oxide/copper-based metal–organic framework (PrGO/HKUST-1) has been successfully fabricated by incorporating electrochemically synthesized poly(3,4-ethylenedioxythiophene)-reduced graphene oxide (PrGO) and hydrothermally synthesized copper-based metal–organic framework (HKUST-1). The field emission scanning microscopy (FESEM) and elemental mapping analysis revealed an even distribution of poly(3,4-ethylenedioxythiophene) (PEDOT), reduced graphene oxide (rGO) and HKUST-1. The crystalline structure and vibration modes of PrGO/HKUST-1 were validated utilizing X-ray diffraction (XRD) as well as Raman spectroscopy, respectively. A remarkable specific capacitance (360.5 F/g) was obtained for PrGO/HKUST-1 compared to HKUST-1 (103.1 F/g), PrGO (98.5 F/g) and PEDOT (50.8 F/g) using KCl/PVA as a gel electrolyte. Moreover, PrGO/HKUST-1 composite with the longest charge/discharge time displayed excellent specific energy (21.0 Wh/kg), specific power (479.7 W/kg) and an outstanding cycle life (95.5%) over 4000 cycles. Thus, the PrGO/HKUST-1 can be recognized as a promising energy storage material.
Highlights
Supercapacitors are electrical devices which have an excellent energy storage system compared to the conventional capacitors as it possesses high specific energy, long-term cycling life as well as rapid charging/discharging time[1,2,3,4]
The HKUST-1 (Fig. 1(a)(v)) displays a typical octahedral shape morphology, whereas the PrGO/HKUST-1 demonstrates the presence of HKUST-1 and PrGO as both the octahedral morphology as well as wrinkle-like reduced graphene oxide (rGO) sheet covered with PEDOT grains are observed in Fig. 1 (a)(vi)
The results demonstrate that the framework of HKUST-1 is retained during the synthesis process which is well supported by the FESEM images (Fig. 1(a)(v-vi)
Summary
Supercapacitors are electrical devices which have an excellent energy storage system compared to the conventional capacitors as it possesses high specific energy, long-term cycling life as well as rapid charging/discharging time[1,2,3,4]. PrGO (Fig. 2(a)(iv)) composite reveals a diffraction peak (2θ = 25.6°), representing the (020) and (002) lattice planes of PEDOT and rGO, respectively.
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