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Supercapacitor is able to provide fast charging rate, environmentally friendly and relatively abundant material availability. Manganese dioxide (MnO2) has a high potential to use as a supercapacitor electrode material because of its significant advantages compared to other metal oxides such as high specific capacitance due to the reversible redox reaction and affordable prices. Briefly, the experiment begins with the preparation of a composite solution with a variety of compositions that was deposited on the aluminum foil substrate as electrodes using the doctor blade method. The supercapacitor was packed in a coin cell with 1 M Et4NBF4. The symmetric supercapacitor cycled in the cell potential window of 0-2 V, exhibited excellent specific capacitance of 52.87 F g−1, with power density of 344.94 Wh kg−1 and maximum energy density of 21.84 Wh kg−1 with 82.23 % capacity retention for 100 cycles. [ABSTRACT FROM AUTHOR]

Supercapacitor has received considerable attention as a promising energy storage device due to its fast charging, excellent cyclic stability, and high-power density. Activated carbon is the main material used to make supercapacitor electrodes because it has a high theory-specific surface area reach of 2,685 m2g−1 and low cost. However, structure micropore activated carbon had poor ionic diffusion and transportability that make inefficient surface area utilization, long charge-discharge performance, and low cycle life. Therefore, continuous research is needed to improve supercapacitor performance by adding and modifying structure micropores to increase the performance of electrochemically active sites so that ionic diffusion is better. This research is focused on the influence of concentration PVP immersion 0 M and 0.06 M with the dehydrogenation method. The higher concentration PVP strongly influenced the microstructure, morphology, and electrochemical process. The activated carbon mesoporous was characterized by XRD, SEM – EDX, FTIR, BET, and Charge Discharge. Further, the supercapacitor with the best performance is shown by the highest concentration of PVP 0.06 M exhibited the highest specific capacitance, energy density, and power density of 83.83 F.g−1, 60.06 Wh kg−1, 454.24 Wkg−1. ACM-0.06 had highest cycle stability in the cell voltage of 0-2.4 V at a current density of 0.1 Ag−1, and maximum energy density is 58.96 Wh kg−1 with 95.82 % capacity retention after 25 cycles. [ABSTRACT FROM AUTHOR]