NiO/MWCNTs复合物的固相合成及其电容性能

Synthesis of the NiO/MWCNTs composites and their capacitive performance

本文通过PEG-400辅助室温固相反应制备Ni(OH)2/MWCNTs前驱物,经300℃下热分解得到NiO/MWCNTs复合物。借助X-射线衍射(XRD)和透射电镜(TEM)测试对产物的晶型及形貌进行了表征,采用循环伏安及恒流充放电测试手段对所得复合物的电容性能进行了分析。结果表明,针状NiO较均匀地附着于碳纳米管的表面,当MWCNTs的含量为60%时,NiO/MWCNTs复合物电极的放电比容量得以有效改善,0.2A.g-1下的其放电比容量可达949 F.g-1,远高于纯NiO(422 F.g-1)及MWCNTs(201 F.g-1)的放电比容量,显示了二者的协同效应。

In this poper,Ni（ OH）2/MWCNTs precursors were prepared via a room-temperature solid-state reaction with the assis- tance of polyethylene glycol（ PEG）400. And then NiO/MWCNTs composites were obtained by calcinating the resulting precursors at 300℃, The structure and morphology of the obtained samples were examined by X-ray diffraction（XRD） and transmission electron micresc0py（TEM）, and their capacitive performances were evaluated by cyclic voltammetry（CV） and galvanostatic charge-discharge tests. The results showed that the needle-like nano-NiO was uniformly coated on the surface of activated MWCNTs. And the NiO/ MWCNTs composite with the MWCNTs content of 60 wt. % can deliver a high specific capacitance of 949 F·g-1 at 0. 2 A · g-1, which is much larger than that of the bare NIO（422 F · g-1 ）and MWCNTs（201 F · g-1 ） ,indicating the synergistic effect of NiO and MWCNTs.