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A nanocrystalline Co3O4@polypyrrole/MWCNT hybrid nanocomposite for high performance electrochemical supercapacitors

机译:用于高性能电化学超级电容器的纳米晶Co 3 O 4 @聚吡咯/ MWCNT杂化纳米复合材料

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In this study, a ternary hybrid nanocomposite of Co3O4@polypyrrole/MWCNT was prepared via oxidative polymerization of pyrrole monomer and a hybrid composite by a hydrothermal process. The synthesized hybrid nanocomposite was characterized by Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy-EDX (SEM-EDX), and field emission resolution transmission electron microscopy (FE-TEM). The results of the structural and morphological studies of the hybrid nanocomposite show its controlled morphology and thermal stability. In addition, the electrochemical performances of charge–discharge cycles and impedance results were evaluated by cyclic voltammetry (CV) analysis. The as-synthesized hybrid nanocomposite was used to fabricate a three-electrode system in the presence of an electrochemical cell with 6 M potassium hydroxide (KOH) as electrolyte. The electrochemical performance of the hybrid composite displays good capacitive behavior with a specific capacitance of 609 F g?1 at a current density of 3 A g?1, energy density 84.58 (W h kg?1), power density 1500 (W kg?1), and a good specific capacitance retention of ca. 97.1% after 5000 continuous charge–discharge cycles, indicating that the hybrid nanocomposite can be a promising electroactive material for supercapacitors.
机译:在这项研究中,制备了Co 3 O 4 @ polypyrrole / MWCNT的三元杂化纳米复合材料。通过水热法将吡咯单体和杂化复合物进行氧化聚合。通过拉曼光谱,X射线衍射(XRD),X射线光电子能谱(XPS),扫描电子显微镜-EDX(SEM-EDX)和场发射分辨率透射电子显微镜(FE-TEM)对合成的杂化纳米复合材料进行了表征。 。杂化纳米复合材料的结构和形态研究结果表明其具有受控的形态和热稳定性。此外,通过循环伏安法(CV)分析评估了充放电循环的电化学性能和阻抗结果。合成的杂化纳米复合材料用于在具有6 M氢氧化钾(KOH)作为电解质的电化学电池存在下制造三电极系统。杂化复合材料的电化学性能表现出良好的电容性能,在3 A g ?的电流密度下的比电容为609 F g ?1 。 1 ,能量密度84.58(W h kg ?1 ),功率密度1500(W kg ?1 < / sup> ),并且在连续的5000次充放电循环后, ca。的比电容保持率高达97.1%,这表明杂化纳米复合材料可以成为超级电容器的有希望的电活性材料。

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