纳米片
材料科学
纳米线
电化学
超级电容器
阳极
电极
纳米结构
同种类的
纳米技术
储能
基质(水族馆)
热液循环
化学工程
光电子学
化学
功率(物理)
海洋学
物理
地质学
工程类
物理化学
热力学
量子力学
作者
Jia Dong,Jin Xu,Kwun Nam Hui,Ye Yang,Xi Tian Zhang,Kar Wei Ng,Shuangpeng Wang,Zi Kang Tang
出处
期刊:Cornell University - arXiv
日期:2019-03-27
摘要
Here we report the extraordinary electrochemical energy storage capability of NiMoO4@NiMoO4 homogeneous hierarchical nanosheet-on-nanowire-arrays (SOWAs) synthesized on nickel substrate by a two-stage hydrothermal process. Comparatively speaking, the SOWAs electrode displays improved electrochemical performances than the bare NiMoO4 nanowire arrays. Such improvements can be ascribed to the characteristic homogeneous hierarchical structure which not only effectively increases the active surface areas for fast charge transfer, but also reduces the electrode resistance significantly by eliminating the potential barrier at the nanowire/nanosheet junction, which is usually an issue in other reported heterogeneous architectures. We further evaluate the performances of the SOWAs by constructing an asymmetric hybrid supercapacitor (ASC) with the SOWAs and activated carbon (AC). The optimized ASC shows excellent electrochemical performances with 47.2 Wh/kg in energy density at 1.38 kW/kg at 0-1.2 V. Moreover, the specific capacity retention can be as high as 91.4% after 4000 cycles, illustrating the remarkable cycling stability of the NiMoO4@NiMoO4//AC ASC device. Our results show that this unique NiMoO4@NiMoO4 SOWAs display great prospect for future energy storage applications
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