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melyan

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[交流] 关于Science那篇质疑EDLC测试的文章！

最近在做碳材料电化学测试的实验，审稿人转了那篇EDLC的文章让研读下，
期中有一句话不甚明白。转一下，请帮忙解释下原因。。
18 NOVEMBER 2011 VOL 334 SCIENCE
True Performance Metrics in Electrochemical Energy Storage
Y. Gogotsi and P. Simon

Many nanomaterials, such as nanotubes or graphene, have a low packing density (<0.5 g/cm3), which leads to empty space in the electrode that will be fl ooded by electrolyte, thereby increasing the weight of the device without adding capacitance. An extreme case would be the use of a carbon aerogel with 90% porosity. The volumetric energy of such an electrode will be 20% that of a carbon electrode with just 50% porosity.

这个所谓空隙率越大，体积容量越低的原因到底是为什么呢？纳米材料的大表面不正是其EDLC形成优点吗？

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