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首页> 外文期刊>RSC Advances >Facile fabrication of hierarchical film composed of Co(OH)2@Carbon nanotube core/sheath nanocables and its capacitive performance
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Facile fabrication of hierarchical film composed of Co(OH)2@Carbon nanotube core/sheath nanocables and its capacitive performance

机译：Co（OH）2 @碳纳米管核/鞘纳米电缆组成的分层膜的制备及其电容性能

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摘要

A hierarchical film composed of Co(OH) _(2) @carbon nanotube (CNT) core/sheath nanocables (CCNF) was generated via a simple and rapid electrophoretic deposition method. It is found that the Co(OH) _(2) sheath was uniformly anchored on the surface of conductive CNT core. The Co(OH) _(2) sheath, with a thickness of ～20 nm, was composed of numerous very tiny nanoparticles. Such a unique nanostructure endows the CCNF with a high surface area of 126 m ~(2) g ~(?1) and a hierarchical porosity, resulting in a large accessible surface area for redox activity. As expected, the CCNF exhibits high specific capacitance and excellent rate performance. Its specific capacitance reached 1215 F g ~(?1) under a low current density of 1 A g ~(?1) and was maintained at 832 F g ~(?1) when the current density was increased 20 times to 20 A g ~(?1) . A high capacitance retention of 99.3% was achieved after 10?000 cycles at 1 A g ~(?1) . Such intriguing capacitive behavior is attributed to the synergistic effect of the CNT core and the Co(OH) _(2) sheath.
机译：通过简单而快速的电泳沉积方法生成了由Co（OH）_（2）碳纳米管（CNT）核/鞘纳米电缆（CCNF）组成的分层膜。发现Co（OH）_（2）鞘均匀地锚固在导电CNT芯的表面上。 Co（OH）_（2）鞘层的厚度约为20 nm，由许多非常小的纳米颗粒组成。这种独特的纳米结构使CCNF具有126 m〜（2）g〜（？1）的高表面积和分级的孔隙率，从而为氧化还原活性提供了较大的可及表面积。正如预期的那样，CCNF具有高比电容和出色的倍率性能。在1 A g〜（？1）的低电流密度下，其比电容达到1215 F g〜（？1），当电流密度增加20倍至20 A g时，其比电容保持在832 F g〜（？1）。 〜（？1）。在1 A g〜（？1）下经过10 000次循环后，实现了99.3％的高电容保持率。这种有趣的电容行为归因于CNT核心和Co（OH）_（2）护套的协同作用。

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