writer：F. L. Lai, Y. E. Miao*, L. Z. Zuo, H. Y. Lu, Y. P. Huang, T. X. Liu*
keywords：Bacterial Cellulose Nanofibers, Layered Double Hydroxide Nanosheets, Composites, N-doping, Asymmetric Supercapacitor.
source：期刊
specific source：Small, 2016, 12(24), 3235-3244.
Issue time：2016年
The development of biomass-based energy storage devices is an emerging trend to reduce the ever-increasing consumption of non-renewable resources. Here, nitrogendoped carbonized bacterial cellulose (CBC-N) nanofibers are obtained by one-step carbonization of polyaniline coated bacterial cellulose (BC) nanofibers, which not only display excellent capacitive performance as the supercapacitor electrode, but also act as 3D bio-template for further deposition of ultrathin nickel-cobalt layered double hydroxide (Ni-Co LDH) nanosheets. The as-obtained CBC-N@LDH composite electrodes exhibit significantly enhanced specific capacitance (1949.5 F g^-1 at a discharge current density of 1 A g^-1, based on active materials), high capacitance retention of 54.7% even at a high discharge current density of 10 A g^-1 and excellent cycling stability of 74.4% retention after 5000 cycles. Furthermore, asymmetric supercapacitors (ASCs) are constructed using CBC-N@LDH composites as positive electrode materials and CBC-N nanofibers as negative electrode materials. By virtue of the intrinsic pseudocapacitive characteristics of CBC-N@LDH composites and 3D nitrogen-doped carbon nanofiber networks, the developed ASC exhibits high energy density of 36.3 Wh kg^-1 at the power density of 800.2 W kg^-1. Therefore, this work presents a novel protocol for the large-scale production of biomass-derived highperformance electrode materials in practical supercapacitor applications.