Electrospun Carbon Nanofibers with in Situ Encapsulated Co3O4 Nanoparticles as Electrodes for High-Performance Supercapacitors
Electrospun Carbon Nanofibers with in Situ Encapsulated Co3O4 Nanoparticles as Electrodes for High-Performance Supercapacitors
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DOI：
10.1021/acsami.5b02787
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发表时间：
2015-06-24
影响因子：
9.5
通讯作者：
Kim, Jang-Kyo
中科院分区：
文献类型：
--
作者：
Abouali, Sara;Garakani, Mohammad Akbari;Kim, Jang-Kyo
采用一种简单的电纺和后续热处理的方法制备了均匀分散的纳米Co3O4碳纤维(CNE)作为超级电容器电极。当活性粒子质量分数为68wt%时，Co3O4/CNF电极的比容量为586Fg(-1)，电流密度为1Ag(-1)。当电流密度增加到50Ag(-1)时，保持了约66%的原始电容。电极还表现出优异的循环稳定性，在2A下循环2000次后容量保持率为74%。这些优异的电化学性能归功于活性粒子在CNF基质中的均匀分散，这是作为导电载体的作用。Co3O4纳米颗粒周围形成的负离子状石墨层不仅提高了电极的导电性，而且还防止了纳米颗粒与碳基质的分离。
A facile electrospinning method with subsequent heat treatments is employed to prepare carbon nanofibers (CNEs) containing uniformly dispersed Co3O4 nanoparticles as electrodes for supercapacitors. The Co3O4/CNF electrodes with similar to 68 wt % active particles deliver a remarkable capacitance of 586 F g(-1) a current density of 1 A g(-1). When the current density is increased to 50 A g(-1), similar to 66% of the original capacitance is retained. The electrodes also present excellent cyclic stability of 74% capacity retention after 2000 cycles at 2 A These superior electrochemical properties are attributed to the uniform dispersion of active particles in the CNF matrix, which functions as a conductive support. The onionlike graphitic layers formed around the Co3O4 nanoparticles not only improve the electrical conductivity of the electrode but also prevent the separation of the nanoparticles from the carbon matrix.