Achieving wide potential window and high capacitance for supercapacitors using different metal oxides (viz.: ZrO2, WO3 and V2O5) and their PANI/graphene composites with Na2SO4 electrolyte

Advances in pseudocapacitive and battery-like electrode materials for high performance supercapacitors

“…PANI has also been coupled with other polymers in the presence of carbon materials. [587][588][589][590][591][592][593][594] Faraji et al 595 synthesized exible ternary polyvinylchloride (PVC)/MWCNT/PANI thin lms, which exhibited a C a of 837 mF cm À2 and retained 89% of its initial capacitance aer 2000 cycles in 1 M H 2 SO 4 electrolyte. In another study, a 3D PANI/carbon nanosheet composite provided a C sp of 444 F g À1 at 0.1 A g À1 .…”

Scalable Synthesis of ZrO2 Nanoparticles through Imidazolic Precursor and Evaluation of its Energy Storage Performance

“…The mass of active materials was determined from the weight difference between before and after the coating. The cyclic voltammetry was performed with different scan rates (2,5,10,25,50,75, and 100 mV s À 1 ) within the potential range of À 2 to 6 V. The electrochemical impedance spectroscopy (EIS) was carried out in the frequency range 1 Hz to 10 6 Hz, and the applied amplitude was 0.005 V versus the open circuit potential.…”

“…Noteworthy, the forecasted energy and power density values of the ZrO 2 //AC device is comparable with the several transition metal oxides as well as sulfides based binary nanostructured electrodes. For instance, the NiMnO 3 //rGO (8.43 Wh kg À 1 at 675 W kg À 1 ), [46] NiCo 2 S 4 //Ac (28.3 Wh kg À 1 at 245 W kg À 1 ), [47] MgCo 2 O 4 //AC (12.99 Wh kg À 1 at 448.7 W kg À 1 ), [48] MWCNT-ZrO 2 -Co 3 O 4 //AC (8.9 Wh kg À 1 at 837.2 W kg À 1 ), [49] WO 3 -PANI-Graphene (11.58 Wh kg À 1 at 800 W kg À 1 ) and V 2 O 5 -PANI-Graphene (57 Wh kg À 1 at 900 W kg À 1 ), [50] ZrO 2 //C (29 Wh kg À 1 at 1500 W kg À 1 ) [51] and carbon aerogel//ZrO 2 (27 Wh kg À 1 at 140 W kg À 1 ). [52] The better electrochemical performance of the ASC device is due to the superior reversible ion storage mechanism, higher surface area and well-packed nanostructure of ZrO 2 .…”

High-Temperature Supercapacitors Based on MXene with Ultrahigh Volumetric Capacitance

“…By controlling the hydrothermal synthesis process, V 2 O 5 with different shapes and structures can be achieved to increase the specific surface area. 25,26 However, the challenge faced by vanadium pentoxide is still poor electrical conductivity. To solve this problem, V 2 O 5 is usually grown on other substrates such as graphene nanosheets, carbon nanotubes, etc.…”

“…V 2 O 5 is a common transition metal oxide, which is considered as a potential electrode material due to its high theoretical specific capacitance and low cost. − At present, the research on V 2 O 5 has been very in-depth. By controlling the hydrothermal synthesis process, V 2 O 5 with different shapes and structures can be achieved to increase the specific surface area. , However, the challenge faced by vanadium pentoxide is still poor electrical conductivity. To solve this problem, V 2 O 5 is usually grown on other substrates such as graphene nanosheets, carbon nanotubes, etc.…”