Journal Article

Adenine-functionalized Spongy Graphene for Green and High-Performance Supercapacitors

El-Gendy, Dalia M., Allam, Nageh K., El Sherbini, E. E. Foad, Ghany, Nabil A. Abdel

2017

Overview

A simple method is demonstrated to prepare spongy adenine-functionalized graphene (SFG) as interconnected, porous 3-dimensional (3D) network crinkly sheets. Such 3D network structure provides better contact at the electrode/electrolyte interface and facilitates the charge transfer kinetics. The fabricated SFG was characterized by X-ray diffraction (XRD), FTIR, scanning electron microscopy (FESEM), Raman spectroscopy, thermogravimetric analysis (TGA), UV−vis absorption spectroscopy, and transmission electron microscopy (TEM). The synthesized materials have been evaluated as supercapacitor materials in 0.5 M H 2 SO 4 using cyclic voltammetry (CV) at different potential scan rates, and galvanostatic charge/discharge tests at different current densities. The SFG electrodes showed a maximum specific capacitance of 333 F/g at scan rate of 1 mV/s and exhibited excellent cycling retention of 102% after 1000 cycles at 200 mV/s. The energy density was 64.42 Wh/kg with a power density of 599.8 W/kg at 1.0 A/g. Those figures of merit are much higher than those reported for graphene-based materials tested under similar conditions. The observed high performance can be related to the synergistic effects of the spongy structure and the adenine functionalization.

• Publisher: Nature Publishing Group UK,Nature Publishing Group
• Subject: 639/301/299/161/886 / 639/4077/4079/4105 / Absorption spectroscopy / Adenine / Adenine - chemistry / Capacitance / Electric Capacitance / Electrodes / Electrolytes / Graphite - chemistry / Humanities and Social Sciences / Microscopy, Electron, Scanning / multidisciplinary / Raman spectroscopy / Scanning electron microscopy / Science / Spectroscopy / Spectrum analysis / Spectrum Analysis, Raman / Synergistic effect / Transmission electron microscopy / X-Ray Diffraction