基于原位化学氧化聚合并结合真空辅助成型获得了聚苯胺(PANI)包裹碳纳米管(CNTs)的CNTs/PANI自支撑复合电极,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅里叶红外光谱测试仪(FT-IR)对CNTs/PANI复合膜的微观形貌和结构进行表征,并利用电化学工作站对其电化学性能进行了测试。实验结果表明,CNTs被PANI颗粒均匀包覆。CNTs/PANI-15(CNTs与An的质量比为1∶15)复合电极的比电容为387F/g(电流密度为0.5A/g),且在3A/g电流密度下连续循环10000圈时,电容保持率为86%。而纯PANI在8000次循环充放电测试后,电容保持率低至66%,且结构几乎坍塌。其原因在所制备的CNTs/PANI复合电极材料兼具PANI的赝电容和CNTs的双电层电容的双重储能机理,通过二者的协同作用显著改善了CNTs/PANI复合膜的电化学性能。
In this paper,carbon nanotubes/polyaniline (CNTs/PANI) self-supporting composite electrode of PANI wrapped CNTs was obtained through in situ chemical oxidation polymerization and vacuum-assisted molding method.The morphology and microstructure of the CNTs/PANI composite films were characterized by scanning electron microscopy (SEM),X-ray diffractometer (XRD) and Fourier infrared spectroscopy (FT-IR),and the electrochemical properties were measured using an electrochemical workstation.The results showed that PANI nanoparticles uniformly coated CNTs.The specific capacitance of CNTs/PANI-15 (CNTs to An mass ratio of 1∶15) composite electrode was 387F/g when the current density was 0.5A/g,and its capacitance retention ratio was 86% after 10,000 charge-discharge cycles at a current density of 3A/g.However,the capacitance retention rate of pure PANI was as low as 66% after 8000 charge-discharge cycles,and the structure almost collapsed.The reason could be attributed to the synergistic effect between the pseudo capacitance of the PANI and the double layer capacitance of the CNTs,which significantly improved the electrochemical performance of the CNTs/PANI composite film.
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基金资助
材料腐蚀与防护四川省重点实验室开放基金(2020CL16,2019CL10);自贡市科技局重点研发项目(2020YGJC12);大学生创新创业训练计划资助项目(cx2021002,cx2022001)
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