Performance of templated mesoporous carbons in supercapacitors
Performance of templated mesoporous carbons in supercapacitors
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DOI：
10.1016/j.electacta.2006.09.063
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发表时间：
2007-02
影响因子：
6.6
通讯作者：
M. Sevilla;S. Álvarez;T. Centeno;A. B. Fuertes;F. Stoeckli
中科院分区：
文献类型：
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作者：
M. Sevilla;S. Álvarez;T. Centeno;A. B. Fuertes;F. Stoeckli
与其他类型的碳类似，模板介孔碳（TMC）可以用作超级电容器。它们的贡献主要来自于其表面形成的双电层容量，在含水电解质如H2SO 4和KOH中为0.14Fm− 2，在非质子介质（C2 H5）4 NBF 4中为0.06Fm− 2。在一系列27个TMC的情况下，似乎通过独立技术测定的有效表面积可以高达1500- 1600 m2 g −1，因此超过了许多活性炭获得的值（通常为900- 1300 m2 g −1）。另一方面，与活性炭相反，本发明的TMC中相对低量的表面氧降低了赝电容效应的贡献，并将含水电解质的重量电容限制在200- 220 Fg-1。在非水电解质的情况下，它很少超过100 Fg-1。与孔径大于1.0-1.3nm的典型活性炭相比，平均中孔直径的TMCs并没有显著提高离子迁移率。这项研究表明，活性炭仍然是具有高性能的超级电容器的更有前途的候选者。
By analogy with other types of carbons, templated mesoporous carbons (TMCs) can be used as supercapacitors. Their contribution arises essentially from the double layer capacity formed on their surface, which corresponds to 0.14Fm−2in aqueous electrolytes such as H2SO4and KOH and 0.06Fm−2for the aprotic medium (C2H5)4NBF4in CH3CN. In the case of a series of 27 TMCs, it appears that the effective surface area determined by independent techniques can be as high as 1500–1600m2g−1, and therefore exceeds the value obtained for many activated carbons (typically 900–1300m2g−1). On the other hand, the relatively low amount of surface oxygen in the present TMCs, as opposed to activated carbons, reduces the contribution of pseudo-capacitance effects and limits the gravimetric capacitance to 200–220Fg−1for aqueous electrolytes. In the case of non-aqueous electrolyte, it rarely exceeds 100Fg−1. It is also shown that the average mesopore diameter of these TMCs does not improve significantly the ionic mobility compared with typical activated carbons of pore-widths above 1.0–1.3nm. This study suggests that activated carbons remain the more promising candidates for supercapacitors with high performances.