Bacterial‐Cellulose‐Derived Carbon Nanofiber@MnO 2 and Nitrogen‐Doped Carbon Nanofiber Electrode Materials: An Asymmetric Supercapacitor with High Energy and Power Density

A new kind of high-performance asymmetric supercapacitor is designed with pyrolyzed bacterial cellulose (p-BC)-coated MnO2 as a positive electrode material and nitrogen-doped p-BC as a negative electrode material via an easy, efficient, large-scale, and green fabrication approach. The optimal asymmetric device possesses an excellent supercapacitive behavior with quite high energy and power density. Nowadays, supercapacitors have drawn extensive attention because they can instantaneously transport a higher power within a very short period than rechargeable batteries, and they possess higher energy density than conventional dielectric capacitors,1 which make them promising for applications such as…