Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon
Large Pseudocapacitance in Quinone-Functionalized Zeolite-Templated Carbon
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DOI：
10.1246/bcsj.20130292
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发表时间：
2014-02-15
影响因子：
4
通讯作者：
Kyotani, Takashi
中科院分区：
文献类型：
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作者：
Itoi, Hiroyuki;Nishihara, Hirotomo;Kyotani, Takashi
分子筛模板碳(ZTC)是由巴氏碗状纳米颗粒组装而成的三维规则网络，可作为沸石的负复制品获得。ZTC不仅具有这种独特的骨架结构，而且还具有大量的碳边位置。在本文中，我们报道了ZTC的边缘位置很容易被大量的苯醌基团通过电化学氧化而功能化，而且由于苯醌/对苯二酚氧化还原对产生的大的赝电容量，在水电解质溶液(1M H_2SO_4)中，苯醌功能化的ZTC表现出高的电化学电容(约300-500Fg(-1))。此外，ZTC即使在数千次充放电循环后仍保持高容量。
Zeolite-templated carbon (ZTC), which can be obtained as a negative replica of a zeolite, consists of buckybowl-like nanographenes assembled into a three-dimensional regular network. ZTC is characterized not only by this unique framework structure but also by a very large number of carbon edge sites. In this paper, we report that the edge sites of ZTC are easily functionalized by a large amount of quinone groups through electrochemical oxidation unlike general carbonaceous materials, and the quinone-functionalized ZTC shows a high electrochemical capacitance (ca. 300 -500 F g(-1)) in an aqueous electrolyte solution (1M H2SO4) as a result of the large pseudocapacitance derived from a quinone/hydroquinone redox couple. Moreover, ZTC keeps its high capacitance even after thousands of charge-discharge cycles.