High-Energy Aqueous Ammonium-Ion Hybrid Supercapacitors

The development of novel electrochemical energy storage devices is a grand challenge. Here, an aqueous ammonium-ion hybrid supercapacitor (A-HSC), consisting of a layered delta-MnO2 based cathode, an activated carbon cloth anode, and an aqueous (NH4)(2)SO4 electrolyte is developed. The aqueous A-HSC demonstrates an ultrahigh areal capacitance of 1550 mF cm(-2) with a wide voltage window of 2.0 V. An amenable peak areal energy density (861.2 mu Wh cm(-2)) and a decent capacitance retention (72.2% after 5000 cycles) are also achieved, surpassing traditional metal-ion hybrid supercapacitors. Ex situ characterizations reveal that NH4+ intercalation/deintercalation in the layered delta-MnO2 is accompanied by hydrogen bond formation/breaking. This work proposes a new paradigm for electrochemical energy storage.