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.

Czech Advanced Technology and Research Institute Palacký University Olomouc Šlechtitelů 27 779 00 Olomouc Czech Republic

Department of Physical Chemistry Faculty of Science Palacký University Olomouc 17 listopadu 12 771 46 Olomouc Czech Republic

IT4Innovations VSB Technical University of Ostrava 17 listopadu 2172 15 708 00 Ostrava Poruba Czech Republic

Nanotechnology Centre Centre of Energy and Environmental Technologies VŠB Technical University of Ostrava 17 listopadu 2172 15 708 00 Ostrava Poruba Czech Republic

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