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ÒýÓúÍCopy£º George Zheng Chen 109.41 ¡¤ University of Nottingham (UK and China Campues) Capacitance value can be determined from CV and GCD. For this purpose, the CV must be rectangular, and the GCD be linear (or triangular). Peak-shaped CV and non-linear GCD should not be used for capacitance analysis. The differential capacitance as mentioned above is useful for capacitance analysis in the context of supercapacitor only if the CV is rectangular. For using a rectangular CV and linear GCD, the simple equation below is used. C = Q/U where C is the capacitance, Q the charge passed for recording the CV or GCD. Note that in both cases, you can use either the Q value from forward or backward scan; or charging or discharging. However you can also use the total Q value derived from the area enclosed in the CV, and of course the total Q needs to be divided by 2. I shall point out that the CVs attached to your message are peak-shaped and hence not suitable for capacitance analysis. However, you may obtain a rectangular CV if you record your CV in a narrower potential range, e.g. between -0.1 V and -0.6 V. If so, you can use the above simple equation. ·¢×ÔСľ³æIOS¿Í»§¶Ë |
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