The carbon spheres (CSs) synthesized by an ultrasonic-spray pyrolysis method were activated for supercapacitor electrode. There are plenty of cracks on the surface of the activated carbon spheres (ACSs), which expend with increasing the activation temperature and activator dosage. The specific capacitance of ACSs increases with the activation temperature and activator dosage and reach to maximal value at certain conditions. Importantly, the ACS sample activated at relatively low activation temperature (600 °C) and 7 of mass ratio of KOH to CSs has the highest specific capacitance (about 209 F g⁻¹ at 50 mA g⁻¹ of current density) and indicates the excellent cycling stability after 1000 consecutive charge–discharge cycles. Furthermore, the graphene sheets could be found in the samples that were activated at 1000 °C. And the electrode prepared by the sample has the very low series resistance because of the excellent conductivity of the formed graphene sheets.

通过超声喷雾热解法合成的碳球被活化为超级电容器电极。活性炭球（ACSs）的表面上有很多裂缝，随着裂缝的活化温度和活化剂用量的增加，裂缝会越来越大。ACS的比电容随激活温度和激活剂剂量的增加而增加，并在某些条件下达到最大值。重要的是，ACS样品在到的CS KOH的质量比相对低的活化温度（600℃）和7活化的具有最高的比电容（约209 F G ^-1在50mA克^-1电流密度），并表示在连续1000次充放电循环后具有出色的循环稳定性。此外，可以在1000°C下活化的样品中发现石墨烯片。并且，由样品制备的电极由于形成的石墨烯片的优异的导电性而具有非常低的串联电阻。