Chen Xiaobo, Liu Xiao, Liu Yongxu, Zhu Yameng, Zhuang Guoce, Zheng Wei, Cai Zhenyu, Yang Peizhi
School of New Energy and Electronic Engineering, Yancheng Teachers University Yancheng 224051 PR China
Key Laboratory of Education Ministry for Advance Technique and Preparation of Renewable Energy Materials, Yunnan Normal University Kunming 650500 PR China
RSC Adv. 2018 Sep 10;8(55):31594-31602. doi: 10.1039/c8ra06289g. eCollection 2018 Sep 5.
Three-dimensional (3D) hierarchical CoMnO@CoO core/shell nanoneedle/nanosheet arrays for high-performance supercapacitors were designed and synthesized on Ni foam by a two-step hydrothermal route. The hybrid nanostructure exhibits much more excellent capacitive behavior compared with either the pristine CoMnO nanoneedle arrays alone or CoO nanosheets alone. The formation of an interconnected pore hybrid system is quite beneficial for the facile electrolyte penetration and fast electron transport. The CoMnO@CoO electrode can achieve a high specific capacitance of 1627 F g at 1 A g and 1376 F g at 10 A g. In addition, an asymmetric supercapacitor (ASC) was assembled by using the CoMnO@CoO core/shell hybrid nanostructure arrays on Ni foam as a positive electrode and activated carbon as a negative electrode in an aqueous 3 M KOH electrolyte. A specific capacitance of 125.8 F g at 1 A g (89.2% retention after 5000 charge/discharge cycles at a current density of 2 A g) and a high energy density of 44.8 W h kg was obtained. The results indicate that the obtained unique integrated CoMnO@CoO nanoarchitecture may show great promise as ASC electrodes for potential applications in energy storage.
通过两步水热法在泡沫镍上设计并合成了用于高性能超级电容器的三维（3D）分级CoMnO@CoO核/壳纳米针/纳米片阵列。与单独的原始CoMnO纳米针阵列或单独的CoO纳米片相比，这种混合纳米结构表现出更优异的电容性能。相互连接的孔隙混合体系的形成有利于电解质的轻松渗透和快速电子传输。CoMnO@CoO电极在1 A g时可实现1627 F g的高比电容，在10 A g时为1376 F g。此外，以泡沫镍上的CoMnO@CoO核/壳混合纳米结构阵列作为正极，活性炭作为负极，在3 M KOH水溶液电解质中组装了一个不对称超级电容器（ASC）。在1 A g时比电容为125.8 F g（在2 A g的电流密度下进行5000次充/放电循环后保留率为89.2%），并获得了44.8 W h kg的高能量密度。结果表明，所获得的独特集成CoMnO@CoO纳米结构作为ASC电极在储能潜在应用中可能具有巨大潜力。
