水热处理对Co-Al双氢氧化物电容性能的影响

Capacitance Property of Co-Al Double Hydroxide After Hydrothermal Treatment

采用化学共沉淀法制备了Co Al双氢氧化物 ,XRD测试表明 ,产物为层状结构 ,属于六方晶系 ,部分产物经水热处理后晶化程度增加。电化学测试表明 ,这 2种Co Al双氢氧化物作为电极材料皆具有典型的电容性能 ,Co Al双氢氧化物单电极比容量达到 4 0 0F/ g。经水热处理后单电极比容量提高了 15 % ,达 4 6 0F/ g ,电极内阻仅有数十毫欧姆。2 0

Co Al layered double hydroxides(LDH) were prepared by chemical co precipitation. Part of them were treated by hydrothermal method at 130 ℃ for 16 h. The two materials are of layered structure and belong to hexagonal system as characterized by XRD, and the latter becomes further crystallized. Electrochemical measurements show that two Co Al LDHs as electrode material have typical capacitance property in a 6 mol/L KOH aqueous electrolyte. The specific capacitance of single electrode is 400 F/g and 460 F/g respectively and the latter′s impedance is only tens of mΩ. After 200 cycles the latter′s capacitance decreases little.