Bioinspired leaves-on-branchlet hybrid carbon nanostructure for supercapacitors.
Bioinspired leaves-on-branchlet hybrid carbon nanostructure for supercapacitors.
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DOI：
10.1038/s41467-018-03112-3
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发表时间：
2018-02-23
影响因子：
16.6
通讯作者：
Fisher TS
中科院分区：
文献类型：
--
作者：
Xiong G;He P;Lyu Z;Chen T;Huang B;Chen L;Fisher TS
以高度有序的结构设计电极，同时具有适当的取向、出色的机械稳定性和高的电导率，以实现优异的电化学性能仍然是一个艰巨的挑战。受自然界中叶子显著增加暴露的树木表面积以吸收环境(如电解液)中的二氧化碳(如离子)进行光合作用的现象的启发，我们报告了一种具有生物灵感的枝叶结构的微管道的设计，该微管道由碳纳米管阵列作为小枝，石墨烯花瓣作为这种电极的叶子。具有中空通道的分级全碳微管道电极具有高的面积电容2.35 F cm−2(约500 F g−1，基于活性物质质量)、高的倍率能力和出色的循环稳定性(10,000次循环的容量保持率为95%)。此外，Nernst-Planck-Poisson计算阐明了由尖锐的石墨烯花瓣边缘控制的电荷转移和存储的潜在机制，从而为其出色的电化学性能提供了见解。提高超级电容器性能的一种方法是使用混合碳纳米材料。在这里，作者展示了一种以石墨烯花瓣和碳纳米管阵列分别作为叶子和小枝的仿生电极设计。该结构具有优异的电化学性质。
Designing electrodes in a highly ordered structure simultaneously with appropriate orientation, outstanding mechanical robustness, and high electrical conductivity to achieve excellent electrochemical performance remains a daunting challenge. Inspired by the phenomenon in nature that leaves significantly increase exposed tree surface area to absorb carbon dioxide (like ions) from the environments (like electrolyte) for photosynthesis, we report a design of micro-conduits in a bioinspired leaves-on-branchlet structure consisting of carbon nanotube arrays serving as branchlets and graphene petals as leaves for such electrodes. The hierarchical all-carbon micro-conduit electrodes with hollow channels exhibit high areal capacitance of 2.35 F cm−2 (~500 F g−1 based on active material mass), high rate capability and outstanding cyclic stability (capacitance retention of ~95% over 10,000 cycles). Furthermore, Nernst–Planck–Poisson calculations elucidate the underlying mechanism of charge transfer and storage governed by sharp graphene petal edges, and thus provides insights into their outstanding electrochemical performance. One way to improve the performance of supercapacitors is to use hybrid carbon nanomaterials. Here the authors show a bioinspired electrode design with graphene petals and carbon nanotube arrays serving as leaves and branchlets, respectively. The structure affords excellent electrochemical characteristics.
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影响因子：
17.1
作者：
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通讯作者：
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