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[求助]
大家做超级电容器两电极体系测试时的电压降大吗？电压降有多少？
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| 我的怎么会有0.4或者0.5V那么大？是电池壳的原因嘛？谢谢！大家交流一下 |
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Conway总结了几大原因：【Journal of Power Sources 135 (2004) 332–343】 (a) Self-discharge at electrodes which have been polarized to overcharge potentials, i.e. beyond potentials corresponding to the thermodynamic decomposition potential of the solution. (b) Self-discharge by parasitic processes involving Faradaic impurity reactions (sometimes redox shuttle processes [2]) that can be cathodic or anodic, and may be diffusion-controlled. (c) Apparent self-discharge, over relatively short times, following interruption of polarizing currents at porous-C electrodes due to non-uniformity of charge acceptance down and amongst pores. This can be experimentally observed and physically simulated in the behavior of hardware, multi-element C/R circuits. (d) A different origin of self-discharge behavior arises at some two-electrode battery configurations where products of charging or corrosion at one electrode become transferred, by diffusion, to the other electrode which then suffers time-dependent depolarization. (e) Finally, a more trivial origin of self-discharge can be short-circuit leakage currents between adjacent cathodes and anodes in imperfectly sealed bipolar electrode configurations. |
13楼2011-07-08 12:02:25
htl1986
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