3D NiS dendritic arrays on nickel foam as binder-free electrodes for supercapacitors
3D NiS dendritic arrays on nickel foam as binder-free electrodes for supercapacitors
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DOI：
10.1007/s10854-016-4878-6
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Yan Zhang;Jie Xu;Yingjiu Zhang;Xiaoyan Hu
中科院分区：
文献类型：
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作者：
Yan Zhang;Jie Xu;Yingjiu Zhang;Xiaoyan Hu
在这项工作中，我们通过简单的溶液方法，在热处理下氧化新鲜泡沫镍并进行硫化过程，成功地在泡沫镍（NiS-Ni）上制造了独特的三维（3D）树枝状NiS纳米片阵列，无需任何额外的镍源、表面活性剂或模板。通过 SEM 和 TEM 观察 NiS-Ni 的形貌，并通过 XRD 图案揭示结晶度。当作为超级电容器电极进行测试时，在泡沫镍上生长的 NiS 树枝状阵列表现出优异的性能，在 1 A g−1 的电流密度下表现出 465.9 F g−1 的比容量。经过7000次循环后，NiS-Ni电极仍能保持其最高值的101.79%，这证明了其优越的循环稳定性能。此外，NiS-Ni 电极在快速充电时表现出高容量保持率。这些结果表明，NiS-Ni无粘合剂电极表现出极大改善的电化学性能，具有高电容和优异的循环稳定性。
In this work, we have successfully fabricated unique three-dimensional (3D) dendritic NiS nanosheet arrays on nickel foam (NiS–Ni) through a simple solution method, oxidizing fresh nickel foam under a heat treatment and following a sulfidation process without the need for any additional nickel sources, surfactant, or templates. The morphology of the NiS–Ni was observed by SEM and TEM, while the crystallinity was revealed by XRD pattern. When tested as the electrode for supercapacitors, the NiS dendritic arrays grown on nickel foam display excellent performance, demonstrating the specific capacity of 465.9 F g−1at the current density of 1 A g−1. After 7000 cycles, the NiS–Ni electrode can maintain 101.79 % of its highest value, which demonstrates its superior cycle stability performance. Also, the NiS–Ni electrode exhibits high capacity retention when fast charging. These results establish that the NiS–Ni binder-free electrode exhibits greatly improved electrochemical performance with high capacitance and excellent cycling stability.