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Synthesis of Iodine‐Functionalized Graphene Electrocatalyst Using Deep Eutectic Solvents for Oxygen Reduction Reaction and Supercapacitors
Author(s) -
Wadekar Pravin H.,
Pethsangave Dattatray A.,
Khose Rahul V.,
Some Surajit
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000750
Subject(s) - electrocatalyst , graphene , supercapacitor , deep eutectic solvent , triiodide , materials science , electrochemistry , oxide , inorganic chemistry , chemical engineering , electrolyte , catalysis , eutectic system , chemistry , nanotechnology , electrode , organic chemistry , alloy , engineering , composite material , dye sensitized solar cell , metallurgy
Iodine‐functionalized reduced graphene oxide (I@RGO) as an active oxygen reduction reaction (ORR) electrocatalyst and energy‐storage material for supercapacitors is synthesized. Herein, a novel deep eutectic solvent (DES) of choline chloride and potassium triiodide is prepared. It is applied to reduce GO and for the consequential functionalization of iodine. The metal‐free iodine‐functionalized graphene is prepared by a facile method, which has a decent electrocatalytic activity for ORR. However, the triiodide structure in I@RGO demonstrates an essential role, considerably indicating electron transfer numbers of 3.87 at a potential of −0.25 V that suggests that the reaction follows a more predominant 4e − (equivalent) pathway. The material also exhibits 242 F g −1 specific capacitance and 27.2 Wh kg −1 energy density at a current density of 1 A g −1 . The electrochemical activity of different materials is analyzed and equally compared with a commercial Pt/C electrode. Based on these noteworthy properties, I@RGO is an excellent contender as a metal‐free ORR catalyst and energy‐storage material for practical applications.