Metal organic framework derived NiCo layered double hydroxide anode aggregated with biomass derived reduced graphene oxide cathode: A hybrid device configuration for supercapattery applications

• Published in: Journal of energy storage Vol. 73; p. 109264
• Main Authors: Prajapati, Megha, Ravi Kant, Chhaya, Allende, Scarlett, Jacob, Mohan V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.12.2023
• Subjects: Energy density; Metal-organic frameworks; Power density; Supercapattery; Power density; Supercapattery; Energy density; Metal-organic frameworks
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2023.109264

Metal-organic frameworks (MOFs), due to its exceptional characteristics like high specific surface area and design diversity, serve as an outstanding sacrificial template in forming layered double hydroxides (LDHs) for highly efficient electrodes in supercapattery devices. In this work, we have prepared bimetallic layered Nickel Cobalt LDH via in-situ etching of Co-ZIF, in different Nickel concentrations directly on Ni foam that enhances the interfacial contact between substrate and the material. The optimised NiCo LDH-2 sample exhibited remarkable electrochemical behaviour with fast electrolyte ion diffusion kinetics ideal for supercapattery device and delivered a high specific capacitance of 2567 Fg−1 at 1 Ag−1. Further, the supercapattery device assembled with Ni-Co LDH as anode and rGO derived from a sustainable source as cathode demonstrated an energy density of 21 Whkg−1, power density of 0.307 kWkg−1 and good cyclic stability with capacitance retention of 88.89 % along with coulombic efficiency of 90.58 % over 1500 cycles. This work proposes an effective approach for designing layered NiCo-LDH that can be further extended to the synthesis of other transition metal-derived LDH for supercapattery devices. [Display omitted] •Co-ZIF is converted into NiCo LDH using in situ etching method directly on Ni foam and used as anode in supercapattery device.•Eco-friendly approach was used to synthesize rGO from coffee grounds using microwave pyrolysis technique and used as cathode for the hybrid device.•The supercapattery device delivers high specific capacitance, energy and power density.•The results portrayed by the fabricated device offer great potential in efficient energy storage applications.