有序介孔C/NiO复合材料的合成及其电化学性能

以嵌段共聚物F127(Mw=12600, PEO106PPO70PEO106)为模板剂, Ni(Ac)2·4H2O为Ni源, 低分子量的酚醛树酯为碳源, 通过溶胶-凝胶三元共组装方法合成高度有序介孔C/NiO复合材料. 对样品进行X射线衍射(XRD)、透射电子显微镜(TEM)、N2吸脱附等结构表征及循环伏安(CV)等电化学性能测试. 结果显示, NiO晶体和碳组成了C/NiO复合材料的基本骨架, 该复合材料具有高度有序的介孔结构. NiO晶体的存在极大地提高了复合材料的电化学性能, 当C/NiO达到4:1(苯酚与Ni(Ac)2·4H2O的摩尔比)时复合材料的比电容达到444.1 F·g-1, 而有序的介孔结构并没有被破坏, 使得该材料具有较好的应用前景.

Preparation and Electrochemical Properties of Ordered Mesoporous C/NiO Composites

Highly ordered mesoporous C/NiO composites were synthesized via the sol-gel process using an amphi-philic triblock copolymer F127 (Mw=12600, PEO106PPO70PEO106) as a template, Ni(OAc)2 as nickel source and resols as an organic precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), and nitrogen adsorption were used to characterize the structure. Cyclic voltammetry (CV)was used to test the electrochemical properties of the samples. The results showed that the backbone of the mesoporous structures consisted of NiO nanocrystallites and carbon. The C/NiO composites have a highly ordered mesostructure. The presence of NiO nanocrystallites was expected to improve the capacitance properties of the composite. At a C/NiOratio of 4:1 (molar ratio of phenol to nickel acetate) the composite had a large specific capacitance of 444.1 F·g-1 and the ordered mesostructure remained intact. Ordered mesoporous C/NiO composites thus are promising for applications.