摘要
Nickel-cobalt sulfide arrays with different loading densities were fixed on nickel foam via a facile hydrothermal method in ethanol. Their loading densities could be easily adjusted via changing the amount of reactants. It was found that the nickel-cobalt sulfide arrays on Ni foam with moderate loading density showed excellent electrochemical performance for supercapacitors. The best sample not only exhibited an outstanding areal capacitance of 4.84 F cm^-2 at 10 mA cm^-2 but also showed the best cycle stability and rate performance compared with the samples with other loading densities.Remarkably, this method to control the loading densities of nickel-cobalt sulfide on nickel foammay provide a new strategy for the investigation of other nanoarrays on various substrates for catalysts and lithium-ion batteries other than supercapacitors.
本文以无水乙醇为溶剂通过水热反应在泡沫镍上生长了不同负载密度的镍钴硫阵列.它们的负载密度可以通过简单方法来调节.而且,通过实验发现,在泡沫镍上生长负载密度适中的镍钴硫阵列时,能获得优异的超电容电化学性能.本实验中,性能最好的实验组不仅在10 mA cm^(-2)时表现出了4.84 F cm^(-2)的杰出面电容,同时也表现出了比其他负载密度实验组更加优异的循环稳定性以及倍率性能.值得注意的是,这种控制镍钴硫阵列负载密度的实验方案,还能够为除了超电容以外的催化及锂电池研究提供一种将其他纳米阵列长在各种衬基上的新策略.
基金
supported by the National Natural Science Foundation of China(51404103,61376073 and 51574117)
Hunan University Fund for Multidisciplinary Developing(2015JCA04)
Fundamental Research Funds for the Central Universities
