Morphology tuning of porous CoO nanowall towards enhanced electrochemical performance as supercapacitors electrodes

Morphology tuning of porous CoO nanowall towards enhanced electrochemical performance as supercapacitors electrodes
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多孔 CoO 纳米墙的形态调整以增强超级电容器电极的电化学性能

DOI:
10.1016/j.cattod.2018.03.024
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发表时间:
2019-06
期刊:
影响因子:
5.3
通讯作者:
Zhang Lei
Zhang Lei
中科院分区:
化学2区
文献类型:
--
作者:
Tang Ning;Wang Wei;You Huihui;Zhai Zhangjie;Hilario Jonas;Zeng Liang;Zhang Lei

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采用溶剂热-退火相结合的方法制备了具有多孔硅结构的CoO。通过控制退火温度可以对CoO的微观形貌进行微调。在400 °C退火条件下,可获得小于50 nm的纳米孔,具有65 m2 g −1的高比表面积。这种独特的多孔结构使得CoO具有较大的比表面积,增加了电解质/电极界面,有利于提高CoO的电化学性能。在1 A g-1下获得了352 F g-1的高比电容,具有良好的倍率性能(1至20 A g-1的电容保持率为72.7%)和良好的循环稳定性(5000次循环后为初始电容的92.9%),使其成为一种有前途的超级电容器电极。
CoO with porous nanowall structure is fabricated by a combined solvothermal and annealing process. The micromorphology of CoO is fine-tuned by controlling the annealing temperature. Nano-sized pores below ∼50 nm are achieved at 400 °C annealing with a high specific surface area of 65 m2g−1. The unique porous nanowall structure leads to large surface areas and increase electrolyte/electrode interfaces, benefiting enhanced electrochemical performance of CoO. High specific capacitance of 352 F g−1has been obtained at 1 A g−1with good rate capability (72.7% capacitance retention from 1 to 20 A g−1) and good cycling stability (92.9% of initial capacitance after 5000 cycles), making it a promising electrode for supercapacitor.
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