掺铝α-氢氧化钴的制备及其电化学性能研究  

Preparation and electrochemical performance of Al-doping cobalt hydroxides

作　　者：陈艳丽[1] 胡中爱[1] 常艳琴[1] 王欢文[1] 张子瑜[1] 杨玉英[1] 

机构地区：[1]西北师范大学化学化工学院,生态环境相关高分子材料教育部重点实验室,甘肃省高分子材料重点实验室,兰州730070

出　　处：《化工新型材料》2011年第7期47-51,共5页New Chemical Materials

基　　金：国家自然科学基金(20963009);甘肃省自然科学基金资助项目(批准号:0803RJA005)

摘　　要：以氯化钴和硝酸铝为原料、聚乙二醇为结构导向剂,采用化学共沉淀法制备成片状掺铝α-氢氧化钴。用X射线衍射(XRD)、场发射扫描电镜(SEM)对样品的结构和形貌进行了表征;用傅里叶变换红外光谱(FT-IR)对样品的成分进行了测定;用循环伏安、恒电流充放电等方法对其电化学性能进行了测试。测试结果表明,钴与铝的摩尔比对目标产物的电化学电容行为有显著的影响。当钴与铝的摩尔比为8∶2时,产品的电化学电容性能最佳,其比电容高达1108F/g,500次充放电循环后,比电容相对于初始值仅衰减了6.9%。The sheet-like Al-doping α-Co（OH）2 was successfully prepared using cobalt chloride and aluminum nitrate as raw material and polyethylene glycol as structure-directing agent by a simple chemical coprecipitation method.The structure and morphology were characterized using X-ray diffraction（XRD） and field emission scanning electron microscopy（FESEM）,respectively.The components of products were analyzed by FT-IR.The electrochemical performances were investigated by cyclic voltammetry and constant current charge/discharge techniques.It was found that the molar ratio of Co2＋ to Al3＋ had a significant influence on electrochemical capacitive behaviors of the products.The electrochemical measurements showed that the Al-doping α-Co（OH）2 with optimal molar ratio up to 8：2（Co2＋ to Al3＋） exhibited excellent specific capacitance（1108F/g）.Furthermore,there was only 6.9% decay in the available capacity after 500 cycles.

关 键 词：片状α-氢氧化钴 铝掺杂 化学共沉淀 电化学电容 

分 类 号：O614.812[理学—无机化学]