以聚多巴胺包覆碳纳米管为载体,借助聚多巴胺超强的粘附性,利用简单的溶液浸渍法制备了磷钼酸负载碳纳米管(PMA@CNTs)复合物.通过傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)和电化学测试等对复合物的组成、结构、形态和超级电容性能进行了表征.结果表明:聚多巴胺可将磷钼酸均匀且牢固地负载在碳纳米管上.在0.5 mol/L的H2SO4电解液中,复合物的最大比容量为511.7 F/g,最大能量密度可达66.8 Wh/kg,相应的功率密度为1000 W/kg.经过1000次循环,比容量无任何衰减.以上研究结果说明PMA@CNTs复合物在电化学储能领域拥有极好的发展前景.
The phosphomolybdic acid coated carbon nanotubes (PMA@CNTs) were successfully fabricated by a facile polydopamine-assisted impregnation method,in which polydopamine can form an extraordinary adhesive interlayer to homogeneously adhere PMA on the surfaces of CNTs.The composition,structure,morphology and supercapacitive performances of the resulting PMA@CNTs hybrids were systematically characterized by a range of experimental tools including fourier transform infrared spectrometer (FTIR),X-ray diffraction (XRD),X-ray photoelectron spectroscope(XPS),scanning electron microscope(SEM),transmission electron microscope(TEM),cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD).The PMA can homogeneously loaded onto the surface of the CNTs with the aid of superior adhesion of polydopamine.Here,the performance of the resulting PMA@CNTs hybrids as supercapacitor electrodes was investigated in a three-electrode arrangement using an aqueous electrolyte (0.5 mol/L H2SO4).The supercapacitor assembled with the PMA50@CNTs hybrids exhibit the highest specific capacitances (511.7 F/g at 10 mV/s) and maximum energy density of 66.8 Wh/kg at power density of 1000 W/kg,based on the total mass of active materials.In addition,the supercapacitor also has excellent cycling stability retaining＞100％ of its specific capacitances after 1000 cycles at current density of 5 A/g.These results demonstrate a simple and scalable application of PMA@CNTs hybrids toward electrochemical energy storage.
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