Tajik S, Dubal DP, Gomez-Romero P, Yadegari A, Rashidi A, Nasernejad B, Inamuddin Asiri AM (2017) Nanostructured mixed transition metal oxides for high performance asymmetric supercapacitors: facile synthetic strategy. Xu W, Chen JH, Yu MH, Zeng YX, Long YB, Lu XH, Tong YX (2016) Sulphur-doped Co 3O 4 nanowires as an advanced negative electrode for high-energy asymmetric supercapacitors. Zhao HP, Liu L, Vellacheri R, Lei Y (2017) Recent advances in designing and fabricating self-supported nanoelectrodes for supercapacitors. Liu H, Zhao K (2016) Asymmetric flow electrochemical capacitor with high energy densities based on birnessite-type manganese oxide nanosheets and activated carbon slurries. The increase in the energy density of the hybrid capacitor is mainly due to the use of aluminum electrolytic capacitor materials for the anode and the use of electrochemical capacitor material for the cathode, which increases the operating voltage and the specific capacitance. It also exhibits excellent cycling performance without obvious capacitance capacity fading. The gravimetric energy density and volume energy density for the hybrid capacitor is 0.49 J g −1 and 0.62 J cm −3, respectively. The hybrid capacitor exhibits superior energy storage density and rapid charge–discharge capacity. The single capacitance reaches 580 μF at a current of 100 mA cm −2, which is double than that of the traditional aluminum electrolytic capacitors at the same size. The results show that the working voltage reaches 105 V. This work successfully prepared a flexible packaging aluminum electrolytic–electrochemical hybrid capacitor with high working voltage and capacitance, using aluminum electrolytic capacitor anode foil as anode and activated carbon composite electrodes as cathode. Low working voltage hinders the wide application of a single electrochemical capacitor, while the rapidly developing industry of electronic components urgently needs a kind of device combining the advantages of high voltage and energy capacity.
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