Fabrication of Ag-doped MnO2 nanosheets@carbon cloth for energy storage device

In this article, we report an electrode of uniform and ultrathin nanosheets of silver-doped manganese oxide (Ag2MnO2) synthesized on carbon cloth through a hydrothermal method with an outstanding specific capacitance for the high-performance aqueous asymmetrical supercapacitor. The Ag2-MnO2 electrode bears the highest specific capacitance of 350 F g-1 at 1 A g-1 and 280 F g-1 at a current density of 40 A g-1. Besides, an aqueous asymmetric supercapacitor (Ag2-MnO2//AC) assembled with Ag2-MnO2 as a positive electrode exhibits a wide potential window of 0-2.0 V and a remarkable energy density of 54 Wh kg-1 at a power density of 2000 W kg-1. Energy density of 26 Wh kg-1 is retained even at a higher power density of 19500 W kg-1. This device offers excellent cycling stability and capacitance retention of 80% after 10,000 GCD cycles.

Automated summary

This article presents an electrode made of uniform and ultrathin nanosheets of silver-doped manganese oxide (Ag2MnO2) with outstanding specific capacitance and energy density for high-performance aqueous asymmetrical supercapacitors. The electrode shows high specific capacitance at high current densities and good energy density even at higher power densities. The device offers excellent cycling stability and capacitance retention.