Observation of High Capacitance from Molecular Gd@C₈₂ in Aqueous Electrolyte Derived from Energy-Level Matching with Proton

Fullerenes with very high specific surface area have never been used as an electrode material in advanced energy storage, which is due to their incompatible electronic structures hindering any large Faradaic capacitance. Here, molecular endohedral metallofullerene of Gd@C 82 for the first time as a novel active material is observed a capacitance of 186 F g −1 and good rate capability in aqueous electrolyte, exceeding other fullerenes (<10 F g...