Cu^(2+)离子掺杂钙锰矿的合成及电化学性质研究  

Study on the Preparation and Electrochemical Property of Cu^(2+) Ion Doped Todorokite

作　　者：邱国红[1] 杨丹[1] 冯雄汉[1] 张旭亮[1] 陈秀华[1] 刘名茗[1] 刘凡[1] 

机构地区：[1]华中农业大学资源与环境学院,武汉430070

出　　处：《高等学校化学学报》2009年第8期1481-1486,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20807019;40771102);教育部新教师基金(批准号:20070504053);国家大学生创新性实验计划(批准号:200703)资助

摘　　要：采用不同方法制备出单一或掺杂Cu2+离子的钙锰矿,分析了其隧道或者骨架结构中掺杂Cu2+离子的合成条件,并应用粉末微电极考察了其电化学活性和稳定性.单一或骨架中掺杂Cu2+离子的钙锰矿可在常压回流条件下制备;隧道中掺杂Cu2+离子的钙锰矿须经高温高压热液反应合成,且反应温度是影响产物纯度的主导因素.钙锰矿在高pH值溶液中电化学稳定性较好;骨架中掺杂Cu2+离子可提高钙锰矿的电化学活性和稳定性,而隧道中掺杂Cu2+离子的钙锰矿电化学活性较低;结合循环伏安法进一步证明了后者掺杂的Cu2+离子主要位于钙锰矿的隧道中.The todorokite manganese oxides were widely examined as lithium insertion hosts for cathodes in rechargeable lithium batteries, catalytic materials, adsorbents, etc. Cu^2＋ doped todorokites also showed potential as electro-catalytic materials with selectivity. In this paper, the single and Cu^2＋ ion doped todorokites were prepared with different processes, and the influences of reaction conditions on product purity were investigated. The electrochemical activity and stability of todorokites were studied by powder microelectrode. It was found that the single todorokite or with Cu^2＋ doping on structure could be formed at atmosphere pressure by a refluxing process. The Cu^2＋ ion doped todorokite in the tunnel could only be synthesized in autoclave at a relative high temperature and pressure, and reaction temperature was the main influential factor for synthesis of single phase materials in the process. Todorokites exhibited high electrochemical activity and stability in solutions with high pH value. Cu^2＋ ion doping on structure would enhance the electrochemical activity and stability of todorokite, but it had a negative effect for electrochemical characters with Cu^2＋ ion doping in the tunnel. The structure of todorokite with Cu^2＋ doping in the tunnel was further proved by cyclic vohammetry with help of powder microelectrode.

关 键 词：钙锰矿 掺杂 粉末微电极 循环伏安法 

分 类 号：O614.7[理学—无机化学] O646.5[理学—化学]