(中南大学 化学与化工学院，长沙 410083)
摘 要: 以CoCl2为钴源，六次甲基四胺(HMT)为沉淀剂，十二烷基硫酸钠(SDS)为表面活性剂，当溶剂配比(即无水乙醇与去离子水的体积比)为1׃9时，采用均匀沉淀法合成水滑石结构的α-Co(OH)2。用X射线衍射和扫描电镜对合成产物的物相和形貌进行表征，通过恒电流充放电和循环伏安法研究α-Co(OH)2电极的电化学电容行为。结果表明：在1 mol/L KOH溶液中，−0.2～0.45 V (vs SCE)电位范围内，5 mA电流充放电时，合成的α-Co(OH)2单电极的初始比容量为184.28 F/g，经过800次循环后样品的比容量仍保持在90%以上。
关键字: α-Co(OH)2；均匀沉淀法；比容量；电化学电容器
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The α-Co(OH)2 with hydrotalcite-like structure was synthesized by homogeneous precipitation method using cobalt chloride as source of cobalt, hexamethylenetetramine(HMT) as precipitating agent and sodium dodecyl sulfate (SDS) as surface active agent at the solvent ratio (volume ratio of ethanol to deionized water) of 1׃9. The structure and surface morphology of α-Co(OH)2 synthesized were characterized by using X-ray diffractometry and scanning electron microscopy. The electrochemical performances of α-Co(OH)2 were tested with galvanostatic charge-discharge and cyclic voltammetry(CV). The results show that the initial specific capacitance of α-Co(OH)2 electrode reaches 184.28 F/g in 1 mol/L KOH electrolyte in the potential range of −0.2−0.45 V(vs SCE) at the charge-discharge current of 5 mA, and the specific capacitance of 90% is maintained after 800 charge-discharge cycles.
Key words: α-Co(OH)2; homogeneous precipitation method; specific capacitance; electrochemical capacitor
