One Pot Solvothermal Synthesis of Sandwich-like Mg Al Layered Double Hydroxide anchored Reduced Graphene Oxide: An excellent electrode material for Supercapacitor. (20th November 2016)

• Record Type: Journal Article
• Authors: Hatui, Goutam; Nayak, Ganesh Chandra; Udayabhanu, G.
• Is Part Of: Electrochimica acta. Volume 219(2016)
• Page Start: 214
• Page End: 226
• Publication Date: 2016-11-20
• Subjects: LDH -- Cyclic Stability -- FESEM -- Graphene -- AFM; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.09.152
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: 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. Abstract: 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 Mg 2+ /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.