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首页> 外文期刊>Physical chemistry chemical physics: PCCP >DNA-assisted assembly of carbon nanotubes and MNO2 nanospheres as electrodes for high-performance asymmetric supercapacitors
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DNA-assisted assembly of carbon nanotubes and MNO2 nanospheres as electrodes for high-performance asymmetric supercapacitors

机译:碳纳米管和MNO2纳米球的DNA辅助组装作为高性能不对称超级电容器的电极

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摘要

A DNA-assisted assembly approach is developed to fabricate a capacitor-type electrode material, DNA-functionalized carbon nanotubes (CNTscaDNA), and a battery-type electrode material, DNA@CNTs-bridged MnO2 spheres (CNTs@DNA-MNO2), for asymmetric supercapacitors. An energy density of 11.6 W h kg~(-1) is achieved at a power density of 185.5 W kg~(-1) with a high MnO2 mass loading of 4.2 mg cm~(-2). It is found that DNA assembly plays a critical role in the enhanced supercapacitor performance. This is because while DNA molecules functionalize carbon nanotubes (CNTs) via π-π stacking, their hydrophilic sugar-phosphate backbones also promote the dispersion of CNTs. The resultant CNTs@DNA chains can link multiple MNO2 spheres to form a networked architecture that facilitates charge transfer and effective MnO2 utilization. The improved performance of the asymmetric supercapacitors indicates that DNA-assisted assembly offers a promising approach to the fabrication of high-performance energy storage devices.
机译:开发了一种DNA辅助组装方法,以制造电容器型电极材料,DNA功能化的碳纳米管(CNTscaDNA)和电池型电极材料,DNA @ CNTs桥接的MnO2球体(CNTs @ DNA-MNO2)。不对称超级电容器。在功率密度为185.5 W kg·(-1)且MnO2质量负载为4.2 mg cm·(-2)的情况下,实现了11.6 W h kg·(-1)的能量密度。发现DNA组装在增强的超级电容器性能中起关键作用。这是因为尽管DNA分子通过π-π堆叠功能化了碳纳米管(CNT),但它们的亲水性糖磷酸主链也促进了CNT的分散。所得的CNTs @ DNA链可以链接多个MNO2球,形成网络结构,从而促进电荷转移和有效的MnO2利用。非对称超级电容器的性能改善表明,DNA辅助组装为高性能储能装置的制造提供了一种有希望的方法。

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