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Graphene with Covalently Grafted Amino Acid as a Route Toward Eco‐Friendly and Sustainable Supercapacitors
Author(s) -
Vermisoglou Eleni C.,
Jakubec Petr,
Bakandritsos Aristides,
Kupka Vojtěch,
Pykal Martin,
Šedajová Veronika,
Vlček Jakub,
Tomanec Ondřej,
Scheibe Magdalena,
Zbořil Radek,
Otyepka Michal
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202101039
Subject(s) - graphene , supercapacitor , covalent bond , moiety , materials science , surface modification , environmentally friendly , capacitance , nanotechnology , energy storage , chemical engineering , electrode , chemistry , organic chemistry , ecology , biology , power (physics) , physics , quantum mechanics , engineering
Eco‐friendly, electrochemically active electrode materials based on covalent graphene derivatives offer enormous potential for energy storage applications. However, covalent grafting of functional groups onto the graphene surface is challenging due to its low reactivity. Here, fluorographene chemistry was employed to graft an arginine moiety via its guanidine group homogeneously on both sides of graphene. By tuning the reaction conditions and adding a non‐toxic pore‐forming agent, an optimum degree of functionalization and hierarchical porosity was achieved in the material. This tripled the specific surface area and yielded a high capacitance value of approximately 390 F g −1 at a current density of 0.25 A g −1 . The applicability of the electrode material was investigated under typical operating conditions by testing an assembled supercapacitor device for up to 30000 charging/discharging cycles, revealing capacitance retention of 82.3 %. This work enables the preparation of graphene derivatives with covalently grafted amino acids for technologically important applications, such as supercapacitor‐based energy storage.