【摘要】 介绍了一种构建钴铝层状双金属氢氧化物/碳球(CoAl-LDH/CSs)复合物的新设计路线。通过生长法使CoAl-LDH生长在CSs上,生长在CSs上的CoAl-LDH薄层由厚度为20 nm的纳米片组成。恒流充放电测试表明,CoAl-LDH/CSs复合物在6 mol/L KOH溶液中以1 A/g的电流密度充放电的比容量为1198 F/g(基于CoAl-LDH/CSs复合物的质量),甚至在高达10 A/g的大电流密度下仍然呈现出920 F/g的较高比容量。而且该复合物以2 A/g的电流密度充放电循环1000次后仍保留928 F/g的比容量,比容量的保留率为84%,这表明与纯的CoAl-LDH相比,CoAl-LDH/CSs复合物具有较高的比容量、优良的倍率性能和良好的循环稳定性。更多还原

【Abstract】 A new design route was presented to fabricate cobalt aluminum-layered double hydroxide(CoAl-LDH) thin layers which grow on carbon spheres(CSs) through a growth method.The CoAl-LDH thin layers consist of nanoflakes with a thickness of 20 nm.The galvanostatic charge-discharge test of the CoAl-LDH/CSs composite shows a great specific capacitance of 1198 F/g at 1 A/g(based on the mass of the CoAl-LDH/CSs composite) in 6 mol/L KOH solution,and the composite displays an impressive specific capacitance of 920 F/g even at a high current density of 10 A/g.Moreover,the composite remains a specific capacitance of 928 F/g after 1000 cycles at 2 A/g,and the specific capacitance retention is 84%,indicating that the composite has high specific capacitance,excellent rate capability and good cycling stability in comparison to pristine CoAl-LDH.更多还原