According to the GCD curve, We use the formula to calculate the specific capacitance (16.7 F g-1）.公式为 C=I*t/（m*V），其中 I 等于放电电流 （0.1mA），t 等于放电时间（900s），m 等于总活性物质质量（2mg），V 等于工作电位 （2.7V）。我的活性材料是活性炭，其理论比电容为 28 F g-1. And almost every paper who use this kind of active carbon get a good specific capacitance in the same current density(at least 25F g-1).Please help me to solve this question.Thank you!!
Chen Wei C=0.09/0.0054 so C=16.67 F/g
The lower specific capacitance of your activated carbon (16.67 F/g) compared to the theoretical value (28 F/g) and reported values (≥ 25 F/g) could be due to factors such as inadequate pore accessibility, lower electrical conductivity, and differences in electrode fabrication or electrolyte properties.
If you've checked all these factors and still notice a difference, it might help to further analyze your material (e.g., BET surface area analysis, pore size distribution) to see if these properties differ from those in the literature, which could affect the specific capacitance.
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