Graphene with Covalently Grafted Amino Acid as a Route Toward Eco‐Friendly and Sustainable Supercapacitors

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 chemist...

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Bibliographic Details
Published in:ChemSusChem 2021-09, Vol.14 (18), p.3904-3914
Main Authors: Vermisoglou, Eleni C., Jakubec, Petr, Bakandritsos, Aristides, Kupka, Vojtěch, Pykal, Martin, Šedajová, Veronika, Vlček, Jakub, Tomanec, Ondřej, Scheibe, Magdalena, Zbořil, Radek, Otyepka, Michal
Format: Article
Language:English
Subjects:
Amino acids
arginine
Capacitance
Covalence
Electrode materials
Energy storage
fluorographene
Functional groups
Grafting
Graphene
supercapacitor
Supercapacitors
ultracapacitor
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Summary: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. Sustainable supercapacitor: The fluorographene chemistry enables the grafting of an arginine moiety homogeneously via its guanidine group on both sides of graphene. Tuning the reaction conditions leads to an optimum degree of functionalization and hierarchical porosity. This material shows a high capacitance (≈390 F g−1 at 0.25 A g−1). Such a two‐electrode device exhibits a capacitance retention of 82.3 % after 30000 galvanostatic charge/discharge cycles.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.202101039