And high specific surface area, which has become an effective electrode material for supercapacitors. Compared with batteries, electrochemical supercapacitors can provide 100 ~ 1000 times of power density, but the energy density is 3 ~ 30 times lower [64]. Therefore, supercapacitors are particularly useful for high-power bursts, such as accelerating / destroying high-speed transportation systems. In addition, the supercapacitor can pass through the electric double-layer charge memory which is not affected by chemical reaction,<br>
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