2D-2D nanohybrids of Ni–Cr-layered double hydroxide and graphene oxide nanosheets: Electrode for hybrid asymmetric supercapacitors

•2D graphene oxide (GO) nanosheets are employed to improve the electrode performance of layer double hydroxide (LDH).•Nanohybrids of Ni–Cr-LDH and GO nanosheets (NCG) are prepared via electrostatic self-assembly method.•NCG nanohybrids enables self-assembly with high surface area, mesoporous morphology, high electrical conductivity, and high charge transfer kinetics.•The aqueous hybrid supercapacitors device displays high energy density (ED) of 51.85 Wh kg–1 and power density (PD) of 1.34 kW kg–1.•All-solid-state hybrid supercapacitor displays exceptional ED of 38.51 Wh kg–1 and PD of 1.33 kW kg–1