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qun19870102

木虫 (小有名气)

[求助] 文献中的有个图实在看不懂,请大家帮忙解析一下,急!!!

(1)图中的横坐标是频率纵坐标是容量,这个图是怎么得到的或者是用什么测试方法得到的.
(2)图中红色和蓝色分别代表正极和负极,并且是在三电极体系中测得的。这里所说的正负极是指的组成的电容器的的正负极吗,如果是,这篇文章中的电容器是对称电容器,两个电极是基本相同的,为什么拿到三电极中测得的结果会差别那么大呢(如图中红色蓝色所示)?
(3)这是文章中对这幅图的解释。 Two and three-electrode cell were applied to deter-
mine total systemas well as electrodes of both polarity separately.Generally, for 1mHz frequency no significant improvement of capacitance (higher than 20%of initial value, i.e.without surfactant)was observed both for whole supercapacitors and for electrodes
considered separately. However, three-electrode cell investigation reveals interesting behavior of electrodes at higher frequencies.For positive electrode in 1mol L−1 H2SO4 enriched by 0.05mol L−1 anionic surfactant (sodium dodecyl sulphate solution) the capac-
itance reaches a peak of 450 F g−1 value at 1Hz frequency which is two times greater than for electrolyte without surfactant (see Fig. 5). Such discrepancy between capacitance behavior of single electrodes at the frequency range from 100mHz to 10Hz has been already observed especially for carbons rich in heteroatoms[22,23]. Themost convincing explanation for the observed anomaly is fact that among two capacitor electrodes one of them can pointout aggravated ability for good dynamic of charge propagation at higher frequencies. For this reason the second electrode supplies additional surplus capacitance to compensate this scarcity to equilibrate the total system. The question iswhy the negative electrode performs worse at higher frequencies, in other words, why the cations penetration into smaller pores is significantly aggravated.
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qun19870102

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引用回帖:
4楼: Originally posted by 格格11 at 2011-10-24 11:18:44:
有两种可能:一是直接用C= -1/(2*Pi*Z". 另一种(更可能)是计算了所谓的”real capacitance". 这是用C' = -Z“/(w|Z|^2).

好像对我很有用。这是不是利用阻抗的原始数据计算出得容量呀,Pi,w是什么意思呀,能不能推荐和这相关的一些文献或者书籍?谢谢~~
6楼2011-10-24 14:56:06
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liblin

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【答案】应助回帖

看不懂  第一眼看上去 感觉像是溶出伏安 但仔细一看坐标又不对了
      这是什么方法来着?  还有 这是个优化图吗? 个人感觉很像
somebody successed because they are destined to,somebodys uccessed because they are determined to.
2楼2011-10-24 10:00:36
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qun19870102

木虫 (小有名气)

引用回帖:
2楼: Originally posted by liblin at 2011-10-24 10:00:36:
看不懂  第一眼看上去 感觉像是溶出伏安 但仔细一看坐标又不对了
      这是什么方法来着?  还有 这是个优化图吗? 个人感觉很像

刚接触这方面,实在不明白,不知道是不是优化图呀。如果是优化图的话,是怎么优化的呀?
3楼2011-10-24 10:51:41
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格格11

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qun19870102(金币+10): 很有帮助,谢谢呀 2011-10-24 14:57:03
有两种可能:一是直接用C= -1/(2*Pi*Z". 另一种(更可能)是计算了所谓的”real capacitance". 这是用C' = -Z“/(w|Z|^2).
4楼2011-10-24 11:18:44
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