其中：

Cm —比容量。

∮Q—循环伏安曲线的积分面积。

θ—扫描速率的数值。

m—活性物质的有效质量。

ΔV—电位窗口的区间值。

将样品制备为工作电极，以铂片为对电极、饱和甘汞电极为参比电极，构成三电极体系。在1M KOH电解质溶液中按照不同的扫描速率，在电位区间为0.0～0.5V下进行进行循环伏安测试。根据循环伏安曲线可知，电极的循环伏安曲线没有氧化还原峰的出现，表现为典型的赝电容行为。根据电容计算公式可以计算出样品氧化铁的比电容量。还研究了不同浓度的电解液与比电容的关系，可知在一定浓度范围内，随着电解液浓度的增大，比电容的值也在变大，当浓度选到1mol／L时，浓度对比电容值影响很小。电解液浓度与比电容的关系可能与电解液的导电能力有关，溶液的导电能力与离子的浓度成正比。

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