酚醛树脂基活性炭微球的电化学性能II.作为EDLC电极材料的活性炭微球的制备及电化学性能

The electrochemical performance of phenolic resin-based activated carbon microbeads Ⅱ. preparation and electrochemical performance of activated carbon microbeads as the electrode materials of EDLC

用直流恒流循环法考察在不同的活化条件下得到的酚醛树脂活性炭微球作为双电层电容器电极的电化学性能。结果表明,要得到高比电容的电容器电极材料,水蒸气活化的最佳条件为:在800℃下活化1h,水蒸气的量控制为氮气量的40%。在此条件下得到的酚醛树脂活性炭微球作为电极具有良好的循环充放电性能,比电容可达到143F/g,充放电效率高达98%。在2.0nm^7.5nm之间的孔对活性炭微球的比电容影响显著。

Phenolic resin-based activated carbon microbeads were used as the electrode materials for electric double-layer capacitors （EDLC） in an aqueous electrolyte. The electrochemical behavior of the EDLC was investigated by the constant current cycling method. It was found that activated carbon microbeads with high specific capacitance could be prepared by steam activation at 800℃ for 1h using an activating agent containing 40 % volume of steam. The obtained activated carbon microbeads had a specific capacitance of 143 F/g, and had excellent charge-discharge properties with a cycling efficiency up to 98 %. Mesopores of 2-7.5 nm had a remarkable influence on specific capacitance.