Synthesis of ternary NiCo-MnO2 nanocomposite and its application as a novel high energy supercapattery device

Abstract

Highlights •NiCo/NiCoMn-mixed hydroxides, ternary NiCo-MnO 2 nanostructures were successfully synthesised. •The samples were used as electrodes for electrochemical supercapacitor in 1 M KOH. •The electrode materials exhibit good charge storage capability on both regions. •Assembled NiCo-MnO 2 /C-FP hybrid supercapattery displays high electrochemical performance.

Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors

“…In this figure, it can be perceived that as scan rate rises the current response rises as result of a good reversibility of the electrode and also because of the constraint in the ion diffusion speed to gratify electronic deactivation of the redox response [36]. Considering the good capacity of the Co3(PO4)2.4H2O/GF composite and the fast ion-transport property of the carbonized polyaniline grafted with Fe3C (C-FP) material recorded from our earlier work [37], a hybrid device was assembled using these materials as the cathode and anode, respectively as shown in Fig. 6(a).…”

Comprehensive Insight into the Mechanism, Material Selection and Performance Evaluation of Supercapatteries

“… 2D MnCo 2 O 4 nanosheet║AC 5 mA cm −1 6 M KOH 366.4 F g −1 1.5 V 33.8 Wh kg −1 318.9 W kg −1 85% after 10,000 cycles [ 223 ] 23. NiCo–MnO 2 ║C-FP 1 A g −1 1 M KOH 130.67 F g −1 1.5 V 48.83 Wh kg −1 896.88 W kg −1 96.78% after 10,000 cycles [ 224 ] 24. Spongy-like α-Ni(OH) 2 ║AC 2 A g −1 6 M KOH 246 F g −1 1.4 V 49 Wh kg −1 696 W kg −1 87% after 2000 cycles [ 225 ] 25.…”

“…Oyedotun et al [ 224 ] constructed a hybrid asymmetric supercapattery using NiCo–MnO 2 ║C-FP electrodes (Fig. 10 a–e), which yielded a specific capacitance of 130.67 F g −1 with an energy density of 48.83 Wh kg −1 and a power density of 896.88 W kg −1 .…”

NiCoSe2/Ni3Se2 lamella arrays grown on N-doped graphene nanotubes with ultrahigh-rate capability and long-term cycling for asymmetric supercapacitor

“…With the significant increase in the consumption of portable electronic devices, electric vehicles and mobile phones, supercapacitors (SCs) have recently drawn much attention due to their ultrahigh power density, long-span cycle life, lightweight and environment friendliness [1][2][3][4][5]. The currently available SCs, although able to possess versatile features, only have an energy density that is one to two orders of magnitude lower than that of a typical rechargeable ion battery [6,7].…”