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首页> 外文期刊>Chemistry: A European journal >Hierarchically Designed Three-Dimensional Macro/Mesoporous Carbon Frameworks for Advanced Electrochemical Capacitance Storage
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Hierarchically Designed Three-Dimensional Macro/Mesoporous Carbon Frameworks for Advanced Electrochemical Capacitance Storage

机译：用于高级电化学电容存储的分层设计的三维宏观/中孔碳骨架

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摘要

Mesoporous carbon (m-C) has potential applications as porous electrodes for electrochemical energy storage, but its applications have been severely limited by the inherent fragility and low electrical conductivity. A rational strategy is presented to construct m-C into hierarchical porous structures with high flexibility by using a carbon nanotube (CNT) sponge as a three-dimensional template, and grafting Pt nanoparticles at the m-C surface. This method involves several controllable steps including solution deposition of a mesoporous silica (m-SiO2) layer onto CNTs, chemical vapor deposition of acetylene, and etching of m-SiO2, resulting in a CNT@m-C core-shell or a CNT@m-C@Pt core-shell hybrid structure after Pt adsorption. The underlying CNT network provides a robust yet flexible support and a high electrical conductivity, whereas the m-C provides large surface area, and the Pt nanoparticles improves interfacial electron and ion diffusion. Consequently, specific capacitances of 203 and 311Fg(-1) have been achieved in these CNT@m-C and CNT@m-C@Pt sponges as supercapacitor electrodes, respectively, which can retain 96% of original capacitance under large degree compression.
机译：中孔碳（m-C）作为电化学能量存储的多孔电极具有潜在的应用前景，但其固有的脆弱性和低电导率已严重限制了它的应用。提出了一种合理的策略，通过使用碳纳米管（CNT）海绵作为三维模板并在m-C表面接枝Pt纳米颗粒，将m-C构造成具有高柔韧性的分层多孔结构。该方法涉及几个可控制的步骤，包括将介孔二氧化硅（m-SiO2）层溶液沉积到CNT上，乙炔的化学气相沉积以及对m-SiO2的蚀刻，从而得到CNT @ mC核壳或CNT @ mC @ Pt吸附后的Pt核-壳杂化结构。下方的CNT网络提供了坚固而灵活的支撑和高电导率，而m-C提供了较大的表面积，而Pt纳米颗粒改善了界面电子和离子扩散。因此，在作为超级电容器电极的这些CNT @ m-C和CNT @ m-C @ Pt海绵中，分别获得了203和311Fg（-1）的比电容，在较大压力下它们可以保留原始电容的96％。

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