Co(OH)2/USY的制备及其超级电容器性能

提出了一种制备纳米-复合物的新方法.这种方法是用USY型分子筛作为模板,用离子交换法、化学沉积和自组装过程合成出具有氧化还原活性的无机纳米结构的复合物.对用这种方法合成的新型纳米-复合物Co(OH)2/USY进行形态和微观结构研究.纳米级高分散的、松散填充的Co(OH)2具有很好的电解质OH-离子电化学可及性和快的扩散速率,这种材料具备了超级电容器的性质而不是传统的电池性能.研究表明:这种材料的比电容高达1 492 F/g单位质量的Co(OH)2相校正后达3 108 F/g].提出这种材料的生成机理.另外,用电化学阻抗谱(EIS)研究了电化学和化学动力学过程,如离子迁移、电导和电化学反应的控速步骤.

Preparation of Co(OH)2/USY and properties of supercapacitors

A new method for preparing nano-composite was proposed. USY zeolite was used as template, on which the redox active inorganic nanostructure was synthesized by ion-exchange method, chemical deposition and self-assembled processes. A novel nano-composite Co(OH)2/USY material was prepared. The morphology and microstructure of the composite were investigated. The highly dispersed, loosely packed Co(OH)2 whiskers at nanometer scale create the electrochemical accessibility of electrolyte OH- ions and fast diffusion rate that are fundamental for material showing the characteristics of supercapacitors rather than conventional batteries. The results show that an extraordinary specific capacitance of 1 492 F/g is achieved or 3 108 F/g after corrected for weight percent of Co(OH)2 phase]. The formation mechanism of the novel composite was proposed. In addition, some electrochemical and chemical kinetics processes, such as ion transfer, electrical conduction, and the rate-determination step of the electrochemical reaction, were investigated by electrochemical impedance spectroscopy (EIS).