Synthesis and high electrochemical performance of polyaniline/MnO2-coated multi-walled carbon nanotube-based hybrid electrodes
Synthesis and high electrochemical performance of polyaniline/MnO2-coated multi-walled carbon nanotube-based hybrid electrodes
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DOI：
10.1007/s10008-012-1694-7
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发表时间：
2012-08-01
影响因子：
2.5
通讯作者：
Park, Soo-Jin
中科院分区：
文献类型：
--
作者：
Kim, Ki-Seok;Park, Soo-Jin
制备了聚苯胺（PANI）/二氧化锰（MnO 2）-多壁碳纳米管（MWNTs）多层电极作为超级电容器的电极材料。采用原位直接包覆法在多壁碳纳米管上存款MnO 2，并将聚苯胺（PANI）包覆在MnO 2-MWNTs上，制备出具有核/壳结构的多层纤维电极。研究了聚苯胺包覆对MnO 2-MWNTs电化学性能和循环稳定性的影响。从循环伏安图中，与MnO 2-MWNTs相比，PANI/MnO 2-MWNTs显示出显著增强的比电容和循环稳定性，其中与原始MWNTs的92 F/g和MnO 2-MWNTs的306 F/g相比，PANI/MnO 2-MWNTs在0.2 A/g的电流密度下获得最高的比电容（350 F/g）。这表明PANI/MnO 2-MWNTs的电化学性能的改善是由于MWNTs上的纳米级包覆的MnO 2增强了电性能，以及PANI包覆通过延迟MnO 2在充放电测试期间的溶解而导致增加的循环稳定性。
Multi-layered electrodes which consist of polyaniline (PANI)/manganese dioxide (MnO2)-multi-walled carbon nanotubes (MWNTs) are prepared as the electrode materials for supercapacitors. MnO2-MWNTs are made by the in situ direct coating method to deposit MnO2 onto MWNTs; the core/shell structure of multi-layered fibrous electrodes can also be obtained by PANI coating onto the MnO2-MWNTs. The effect of PANI coating on the electrochemical performance and cyclic stability of MnO2-MWNTs is investigated. From the cyclic voltammograms, the PANI/MnO2-MWNTs show remarkably enhanced specific capacitance and cycle stability compared to MnO2-MWNTs, where the highest specific capacitance (350 F/g) is obtained at a current density of 0.2 A/g for the PANI/MnO2-MWNTs as compared to 92 F/g for pristine MWNTs and 306 F/g for MnO2-MWNTs. This indicates that the improved electrochemical performance of PANI/MnO2-MWNTs is due to the enhanced electrical properties by nano-scale-coated MnO2 onto MWNTs and the PANI coating that leads to the increased cycle stability by delaying the dissolution of MnO2 during charge/discharge tests.