Fabrication of hybrid supercapacitor based on rod-like HKUST-1@polyaniline as cathode and reduced graphene oxide as anode

• Published in: Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2018-05, Vol.99, p.16-23
• Main Authors: Jafari, Elnaz Abbasi, Moradi, Morteza, Borhani, Saeed, Bigdeli, Hadise, Hajati, Shaaker
• Format: Article
• Language: English
• Subjects: Asymmetric supercapacitor; Composite; MOF; Polyaniline
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2018.01.007

Rod-like HKUST-1 (MOF-199) was hydrothermally synthesized, and the electrochemical capacitance properties of this MOF composited with polyaniline (PANI) were studied. The electrode was characterized by X-ray diffraction technique (XRD), Brunauer, Emmett, and Teller (BET) and scanning electron microscopy (SEM). The electrochemical performance of the HKUST-1 and PANI, as well as HKUST-1/PANI (HP) composite was investigated by cyclic voltammetry and galvanostatic charge-discharge. Pure HKUST-1 showed a low specific capacitance at a current density of 1 A/g, because of its poor conductivity. However, due to the high surface area (190 m2/g) of the rod-like HKUST-1, its composite with PANI led to an improvement in electrochemical performance. The specific capacitance of HP was achieved to be 270 F/g at the current density of 1 A/g, which is much higher than that of HKUST-1 (70 F/g) and PANI (227 F/g). An asymmetric supercapacitor (ASC) was fabricated by using the HP as cathode and rGO nanosheets as anode. This ASC provided a maximum specific power of 7497 W/kg and a specific energy of 6.22 Wh/kg with a wide working potential of 1.5 V and 87% capacity retention after 2000 cycles. Two ASCs connected in series were applied, which without recharging, lightened green and red LEDs up for 3 and 5 min, respectively. •The supercapacitor application of Rod-like HKUST-1/PANI (HP) composite was studied.•Pure HKUST-1 showed a low specific capacitance at a current density of 1 A/g, because of its poor conductivity.•The specific capacitance of HP composite was achieved to be 270 F/g at the current density of 1 A/g.•An asymmetric supercapacitor (ASC) was fabricated by using the HP as cathode and rGO nanosheets as anode.