Flexible and high energy density asymmetrical supercapacitors based on core/shell conducting polymer nanowires/manganese dioxide nanoflakes

Enhancing Specific Capacitance and Cyclic Stability through Incorporation of MnO2 into Bacterial Nanocellulose/PPy·CuCl2 Flexible Electrodes

“…Figure shows the stability results for devices containing BNC/MnO 2 /PPy · CuCl 2 membranes as electrodes. The specific capacitance increases in the first 100–150 cycles, which is attributed to an activation effect due to the electrochemical cycles during analysis . For BNC/MnO 2 /PPy · CuCl 2 [0.04] electrodes, after those initial cycles, the stability drops until it reaches 78% of its initial value.…”

“…New materials and enhanced properties of batteries and supercapacitors are widely investigated due to a variety of applications such as electrical vehicles and wearable devices. Flexible supercapacitors exhibit an interesting combination of properties with high power density, moderate energy density, and high capacitance mechanical flexibility, which are all directly related to the electrode composition …”

“…Metal oxides and conductive polymers have a charge/discharge mechanism based on redox reactions and have received attention as electrode materials. Manganese oxide (MnO 2 ), e.g., exhibits a high theoretical specific capacitance, and it is a relatively low‐cost material and is abundant on earth . Conductive polymers, in contrast, have been studied as electrode materials due to their good conductivity and high charge density combined with low cost, although they usually do not have an adequate long‐term stability.…”

“…Conductive polymers, in contrast, have been studied as electrode materials due to their good conductivity and high charge density combined with low cost, although they usually do not have an adequate long‐term stability. He et al reported that pure PPy nanowires’ specific capacitance decreased to 65.4% of its initial capacitance after 1500 cycles . Polypyrrole (PPy) is one of the mostly used conductive polymers due to its high capacitance, its good redox properties, and its facile chemical synthesis .…”

Ultrafast, Facile, and Scalable Microwave‐Assisted Synthesis Method to Prepare Nickel Sulfide Nanosheets for High Energy Density Hybrid Capacitors

“…The electrochemical performance of the electrodes was tested using GCD, CV, and EIS. These characteristic GCD curves were further used to determine other capabilities of the supercapacitor, such as specific capacitance (C), specific energy density (E), and specific power density (P) . The NiS NS, Ag/AgCl electrode, and Pt foil were used as working, reference, and counter electrode, respectively.…”