TY  - JOUR
N2  - A green, clean, and rapid process employing sunlight for converting a large quantity of graphene oxide (GO) into reduced graphene oxide (rGO) is presented herein. In this protocol, the sunlight is concentrated using a Fresnel lens and focused on GO, and the heat thus generated reduces GO into rGO within seconds. The reduction process and quality of the Fresnel lens rGO (FrGO) thus produced are examined via thermal, spectroscopic, surface, and microscopic analyses. The electrochemical properties and charge storage parameters of FrGO are analysed using galvanostatic charge-discharge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy using a symmetric electrochemical double layer capacitor in three electrolytes, viz. an alkaline aqueous electrolyte, a neutral aqueous electrolyte, and an ionic liquid. The supercapacitors thus developed delivered specific discharge capacitances of �171, 126, and 135 F g-1 at 0.5 A g-1 with potentials of 1.2, 2.0, and 3.4 V, respectively. Owing to the larger potential window and specific capacitance, the devices fabricated using the ionic liquid delivered the highest specific energy (ES) and specific power (PS). The best-performing device showed an ES value as high as �60 W h kg-1 and a PS value as high as �6000 W kg-1, thereby demonstrating the feasibility of the process reported herein for practical applications. This journal is © The Royal Society of Chemistry.
IS  - 10
ID  - scholars14928
KW  - Capacitance; Cyclic voltammetry; Electric discharges; Electrochemical electrodes; Electrochemical impedance spectroscopy; Electrolytes; Energy storage; Ionic liquids; Optical instrument lenses; Reduced Graphene Oxide; Reduction
KW  -  Alkaline aqueous electrolytes; Aqueous electrolyte; Electrochemical double-layer capacitors; Electrochemical energy storage; Galvanostatic charge discharges; Microscopic analysis; Reduced graphene oxides (RGO); Specific capacitance
KW  -  Graphene
KW  -  discharge; electrochemistry; electrolyte; energy storage; feasibility study; oxide group; reduction
Y1  - 2021///
JF  - Sustainable Energy and Fuels
A1  - Yar, A.
A1  - Dennis, J.O.
A1  - Yasin, A.
A1  - Din, F.U.
A1  - Irfan, M.
A1  - Khan, M.S.
A1  - Yang, C.-C.
A1  - Jose, R.
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106067326&doi=10.1039%2fd1se00270h&partnerID=40&md5=891138df004a465b71f80d3ec9785df5
VL  - 5
AV  - none
N1  - cited By 8
SP  - 2724
TI  - The solar reduction of graphene oxide on a large scale for high density electrochemical energy storage
PB  - Royal Society of Chemistry
SN  - 23984902
EP  - 2733
ER  -