One Pot Solvothermal Synthesis of Sandwich-like Mg Al Layered Double Hydroxide anchored Reduced Graphene Oxide: An excellent electrode material for Supercapacitor

•The paper first time reported facile synthesis of RGO@MgAlLDHcomposite.•The RGO@Mg Al LDH showed specific capacitance 1334 F g−1 at 1 A g−1.•Electrochemical study is performed in both three and two electrode system.•The two-electrode system shows a high energy density 388.26 W h Kg−1 at 2 A g−1.•87% retention of specific capacitance also exhibited even after 1000 cycles of GCD.

This work coined a one pot synthesis method for the preparation of sandwiched like Mg/Al layered double hydroxide anchored reduced graphene oxide (RGO@MgAl LDH) nanocomposite for supercapacitor electrode. XRD, FTIR and XPS analysis along with FESEM, AFM and TEM confirmed the sandwiched like structure. Morphological analysis revealed that Mg2+/Al 3+ LDH plates are uniformly grown on the surface of reduced graphene oxide nanosheet. Electrochemical characterization of developed nanocomposites, in 1 M aqueous KOH, gives rise to a specific capacitance of 1334 F g−1 at a current density of 1 A g−1 in three electrode cell set up. However, in two electrode configuration, a specific capacitance of 1092.5 F g−1 has been achieved with 1 M TEABF4 (in acetonitrile) as electrolyte at a current density of 2 A g−1. The cyclic stability test shows about 87% retention of specific capacitance after 10000 consecutive charge-discharge cycles at a steady current density of 5 A g−1 in 2 electrode organic electrolyte system. The energy density of the nanocomposite also shows a high value of 388.26 W h Kg−1 at a current density of 2 A g−1 and a power density of 3198.48 W Kg−1 in two electrode organic electrolyte configuration.

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