Oxygen functional groups on a commercial activated carbon were modified by (NH₄)₂S₂O₈ oxidation and subsequent annealing at different temperatures. The effects of the surface modification on the electrochemical performance as supercapacitor electrodes were investigated by XPS, FTIR, argon adsorption and electrochemical tests. Results indicate that the oxygen functional groups, especially carboxyl and carbonyl groups improved the wettability of the pore surfaces, increased the electrolyte diffusion rate into the electrode and increased the specific capacitance by an additional pseudo-capacitance in a 6mol/L KOH aqueous electrolyte. An excess oxygen content blocked the pores, leading to poor electrochemical performance, but annealing at 300 °C in an inert atmosphere increased the specific capacitance and improved the rate performance in a 6mol/L KOH aqueous electrolyte. In a 1mol/L Et₄NBF₄/PC organic electrolyte, however, oxygen functional groups introduced by (NH₄)₂S₂O₈ oxidation reduced the specific capacitance and annealing at 700 °C to reduce their content effectively increased the specific capacitance.

商业活性炭上的氧官能团被（NH ₄）₂ S ₂ O ₈修饰氧化和随后在不同温度下退火。通过XPS，FTIR，氩气吸附和电化学测试研究了表面改性对作为超级电容器电极的电化学性能的影响。结果表明，氧官能团，尤其是羧基和羰基，通过在6mol / L KOH水性电解质中附加的伪电容，改善了孔表面的润湿性，提高了电解质向电极中的扩散速度，并提高了比电容。过量的氧气会堵塞孔，导致较差的电化学性能，但是在6 mol / L的KOH水性电解质中，在惰性气氛中于300°C退火可以提高比电容并提高倍率性能。在1mol / L Et ₄ NBF中然而，在₄ / PC有机电解质中，通过（NH ₄）₂ S ₂ O ₈氧化引入的氧官能团降低了比电容，并且在700℃下退火以降低其含量有效地提高了比电容。