Graphene-based in-plane micro-supercapacitors with high power and energy densities.
Graphene-based in-plane micro-supercapacitors with high power and energy densities.
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DOI：
10.1038/ncomms3487
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发表时间：
2013
影响因子：
16.6
通讯作者：
Muellen, Klaus
中科院分区：
文献类型：
--
作者：
Wu, Zhong-Shuai;Parvez, Khaled;Feng, Xinliang;Muellen, Klaus
微型超级电容器是小型电子设备的重要片上微电源。尽管通过制造纳米结构材料、开发薄膜制造技术和器件架构，微型超级电容器的性能已得到显着提高，但其功率或能量密度仍与电解电容器或锂薄膜电池相距甚远。在这里，我们展示了任意基板上基于石墨烯的面内叉指微型超级电容器。由此产生的微型超级电容器的面积电容为 80.7 μF cm−2，堆叠电容为 17.9 F cm−3。此外，它们的功率密度为495 W cm−3，高于电解电容器，能量密度为2.5 mWh cm−3，与锂薄膜电池相当，并且具有优异的循环稳定性。这种微型器件允许以高达 1,000 V s−1 的超高速率运行，比传统超级电容器高三个数量级。具有面内几何形状的微型超级电容器对于众多小型化或柔性电子应用具有巨大的前景。 微型超级电容器具有比锂电池高功率密度和比电容器高能量密度的优势，但这些优势的整合尚未实现。吴等人。开发具有超高功率和能量密度的基于石墨烯的面内微型超级电容器。
Micro-supercapacitors are important on-chip micro-power sources for miniaturized electronic devices. Although the performance of micro-supercapacitors has been significantly advanced by fabricating nanostructured materials, developing thin-film manufacture technologies and device architectures, their power or energy densities remain far from those of electrolytic capacitors or lithium thin-film batteries. Here we demonstrate graphene-based in-plane interdigital micro-supercapacitors on arbitrary substrates. The resulting micro-supercapacitors deliver an area capacitance of 80.7 μF cm−2 and a stack capacitance of 17.9 F cm−3. Further, they show a power density of 495 W cm−3 that is higher than electrolytic capacitors, and an energy density of 2.5 mWh cm−3 that is comparable to lithium thin-film batteries, in association with superior cycling stability. Such microdevices allow for operations at ultrahigh rate up to 1,000 V s−1, three orders of magnitude higher than that of conventional supercapacitors. Micro-supercapacitors with an in-plane geometry have great promise for numerous miniaturized or flexible electronic applications. Micro-supercapacitors offer the advantage of high power density over lithium batteries and high energy density over electric capacitors, but integration of these advantages is yet to be achieved. Wu et al. develop a graphene-based in-plane micro-supercapacitor with ultrahigh power and energy densities.
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