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首页> 外文期刊>RSC Advances >Rationally designed hierarchical ZnCo2O4/polypyrrole nanostructures for high-performance supercapacitor electrodes
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Rationally designed hierarchical ZnCo2O4/polypyrrole nanostructures for high-performance supercapacitor electrodes

机译：合理设计用于高性能超级电容器电极的分层ZnCo2O4 /聚吡咯纳米结构

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摘要

Electrodes with rationally designed hybrid nanostructures can offer many opportunities for enhanced performance in electrochemical energy storage. In this work, hierarchical ZnCo2O4/polypyrrole (PPy) nanostructures on Ni foam were rationally designed and successfully fabricated through a facile two-step method and were directly used as an integrated electrode for supercapacitors. The novel nanoscale morphology has been proven to be responsible for their excellent capacitive performance. When used as electrodes in supercapacitors, the hybrid nanostructures demonstrated prominent electrochemical performance with a high specific capacitance (1559 F g(-1) at a current density of 2 mA cm(-2)), a good rate capability (89% when the current density increases from 2 to 20 mA cm(-2)), and a good cycling ability (90% of the initial specific capacitance remained after 5000 cycles at a high current density of 10 mA cm(-2)). Moreover, the high specific energy density is 30.9 W h kg(-1) at a current density of 2 mA cm(-2) in a two-electrode system. The excellent electrochemical performance of hierarchical ZnCo2O4/PPy nanostructures can be mainly ascribed to the enhanced adherent force between electrode materials and Ni foam to hold the electrode fragments together by means of ZnCo2O4 nanowires, the good electrical conductivity of PPy, and the short ion diffusion pathway in ordered porous PPy nanofilms and ZnCo2O4 nanowires.
机译：具有合理设计的杂化纳米结构的电极可以为增强电化学储能性能提供许多机会。在这项工作中，通过便捷的两步法合理设计了镍泡沫上的分层ZnCo2O4 /聚吡咯（PPy）纳米结构，并成功地制备了该结构，并将其直接用作超级电容器的集成电极。事实证明，新颖的纳米级形态是其出色的电容性能的原因。当用作超级电容器中的电极时，杂化纳米结构表现出出色的电化学性能，具有高比电容（在2 mA cm（-2）的电流密度下为1559 F g（-1）），良好的倍率能力（当电导率为89％时）。电流密度从2 mA增加到20 mA cm（-2）），并具有良好的循环能力（在10 mA cm（-2）的高电流密度下经过5000次循环后仍保留了90％的初始比电容）。此外，在两电极系统中，在2 mA cm（-2）的电流密度下，高比能量密度为30.9 W h kg（-1）。分层ZnCo2O4 / PPy纳米结构的出色电化学性能主要归因于电极材料和Ni泡沫之间增强的粘附力，从而通过ZnCo2O4纳米线将电极碎片固定在一起，PPy的良好电导率和短的离子扩散路径在有序的多孔PPy纳米膜和ZnCo2O4纳米线上。

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