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摘要: 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。研究结果表明,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。Abstract: Phenolic resinbased activated carbon microbeads were used as the electrode materials for electric doublelayer 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 143F/g, and had excellent chargedischarge properties with a cycling efficiency up to 98%. Mesopores of 2-7.5nm had a remarkable influence on specific capacitance.
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