High-energy Asymmetric Supercapacitors Research Articles

High-power and high-energy asymmetric supercapacitors based on Li+-intercalation into a T-Nb2O5/graphene pseudocapacitive electrode

T-Nb2O5/graphene nanocomposites were fabricated and then paired with mesoporous carbon electrodes to construct the asymmetrical supercapacitors with high energy and power densities.

High-energy asymmetric supercapacitor based on petal-shaped MnO2 nanosheet and carbon nanotube-embedded polyacrylonitrile-based carbon nanofiber working at 2 V in aqueous neutral electrolyte

An asymmetric supercapacitor (ASC) uses very thin petal-shaped MnO2 nanosheets as the positive electrode and a network of carbon nanotube-embedded polyacrylonitrile-based carbon nanofibers (CNT-CNF electrodes) as the negative electrode. It has a high specific capacitance and a high specific energy density in 0.5 M Na2SO4. An assembled MnO2//CNT-CNF ASC is operated reversibly at a high cell voltage of 2.0 V and exhibits a high specific capacitance of 93.99 F g−1 and an excellent energy density of 52.22 Wh kg−1, which is better than those of ASCs that are based on MnO2//carbon, which can be found in the literature. The MnO2//CNT-CNF ASC has superior cycling stability with 92% retention of initial specific capacitance after 2000 cycles.