Abstract
Activated carbon (AC) was synthesized with various weight ratios of manganese dioxide (MO) through a simple hydrothermal approach. The electrochemical performance of the synthesized activated carbon/MnO2 composites was investigated. The effect of the activated carbon/MnO2 (AM) ratio on the electrochemical properties of the activated carbon/MnO2 composites and the pore structure was also examined. The results show that the specific capacitance of the activated carbon material has been improved after the addition of MO. The as-synthesized composite material exhibits specific capacitance of 60.3 F g−1 at 1 A g−1, as well as stable cycle performance and 99.6% capacitance retention over 5000 cycles.
Highlights
With global warming and a worsening environment, the use of renewable energy sources is becoming increasingly important [1,2]
When spin energy was used to separate 11.6 eV, characteristic peaks of Mn2p1/2 (653.8 eV) and Mn2p3/2 (642.2 eV) appeared, indicating that manganese dioxide (MO) was successfully coated on the AM1 composites [28,29]
activated carbon/MnO2 (AM) composites with various mass ratios of MO were synthesized by the facile hydrothermal method
Summary
With global warming and a worsening environment, the use of renewable energy sources is becoming increasingly important [1,2]. The capacitance of EDLCs mainly depends on the adsorption of anions and cations on or near the electrode/electrolyte interface, which is mainly related to the surface area of the electrode material. Porous carbon, such as in activated carbon [8,9], carbon nanotubes [10,11], carbon nanofibers [12,13]. The as-synthesized AC/MO composites showed more enhanced electrochemical performance than both the pure MO and AC, and it is a promising alternative carbon material for the application of SCs
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