【摘要】 用改良的沉淀法在酸化处理过的碳纳米管(CNTs)上沉积氢氧化镍,经300℃热分解得到NiO/CNTs复合电极材料.采用X射线衍射(XRD)、热重分析(TGA)、扫描电镜(SEM)和Brunauer-Emmett-Teller(BET)比表面积分析等方法对合成的材料进行了物理表征;用循环伏安法和充放电测试对其电化学性能进行了研究.结果表明,CNTs的引入在一定程度上提高了NiO的分散性,从而大大增加了复合电极材料的比电容和倍率容量.掺入20%CNTs后复合电极的比电容达到最高值(309 F·g-1);掺入40%CNTs的复合电极材料扣除CNTs对容量的贡献后(本实验测试CNTs的比容量为35 F·g-1),NiO的放电容量可达420 F·g-1,明显高于纯相NiO的容量(175 F·g-1),并且材料的倍率容量也显著提高.更多还原

【Abstract】 Nickel hydroxide was deposited on the surface of modified carbon nanotubes(CNTs) by im-proved precipitation process,and NiO/CNTs composites were obtained by calcination at 300 ℃.Physical properties of the mixture with different contents of carbon nanotubes were examined by X-ray diffraction(XRD),thermogravimetric analysis(TGA),scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET) surface area measurement.The electrochemical performances were studied by cyclic voltam-mograms,galvanostatic charge/discharge.The results indicated that the introduction of suitable amount of CNTs would result in good capacitive behavior and high-rate capacity,which were brought by good disper-sion of NiO.The specific capacitance of composite electrode is up to 309 F·g-1 when the mass fraction of CNTs in the composite is 20%.When deducted the contributions of CNTs(35 F·g-1),the specific capaci-tance of nickel oxide reaches 420 F·g-1 in NiO/40% CNTs composite electrode.All of these had an obvious improvement compared with pure phase nickel oxide(175 F·g-1).更多还原