摘要
采用化学共沉淀方法制备了Co-Al双金属氢氧化物,用红外光谱对所制样品的成分进行分析;用X射线衍射和场发射扫描电子显微镜表征产物的结构和形貌;用循环伏安、恒电流充放电等测试方法对Co/Al摩尔比为9∶1、8∶2和7∶3的铝代α-Co(OH)2的电化学性能进行研究。测试表明,Co/Al摩尔比为8∶2的铝代α-Co(OH)2具有最佳的电容性能,单电极比电容可达1180F/g,并且在1A/g电流密度下循环500周后,比电容仍能保持91%,有望成为电化学电容器的电极材料。
Co-Al layered double hydroxide was synthesized by a chemical co-precipitation method.The components of products were analyzed by FT-IR and the structure and morphology were characterized using X-ray diffraction and field emission scanning electron microscopy,respectively.The electrochemical performances were investigated by cyclic voltammetry and constant current charge/discharge techniques for Al-substituted α-Co（OH）2 with Co/Al mole ratio 9∶1,8∶2 and 7∶3.The results showed that the Al-substituted α-Co（OH）2 with Co/Al mole ratio 8∶2 has excellent electrochemical performances,and its specific capacitance as single electrode is up to 1180 F/g and remains at about 91% of the initial value after 500 cycles at current density of 1 A/g.It is a promising electrode material for supercapacitor.
出处
《化学通报》
CAS
CSCD
北大核心
2012年第4期324-329,共6页
Chemistry
基金
国家自然科学基金项目(20963009)
甘肃省自然科学基金项目(0803RJ2A005)资助
关键词
电化学电容器
电极材料
Co-Al双金属氢氧化物
电化学性能
Electrochemical capacitor
Electrode materials
Co-Al layered double hydroxides（Co-Al LDHs）
Electrochemical performances
