High-performance asymmetric supercapacitors based on monodisperse MnO nanocrystals with high energy densities.
High-performance asymmetric supercapacitors based on monodisperse MnO nanocrystals with high energy densities.
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DOI：
10.1039/c8nr04541k
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发表时间：
2018-08
期刊：
影响因子：
6.7
通讯作者：
Menggang Li;W. Lei;Yongsheng Yu;Weiwei Yang;Ji Li;Dafa Chen;Shichong Xu;M. Feng;Hai-bo Li
中科院分区：
文献类型：
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作者：
Menggang Li;W. Lei;Yongsheng Yu;Weiwei Yang;Ji Li;Dafa Chen;Shichong Xu;M. Feng;Hai-bo Li
以油酸和十八烯为催化剂，采用热分解法制备单分散球形MnO纳米晶(NCS)，粒径为22.5 nm。所合成的MnO纳米碳管具有优异的电化学性能，在1Ag-1电流密度下的比电容为736.4 Fg-1，经5000次循环后仍保持初始比电容的93.3%。以不对称超级电容器为阴极，以活性碳(AC)电极为阳极，成功组装了MnO NC电极。该器件具有优异的性能，其能量密度为44.2W h kg-1，功率密度为900W kg-1，循环稳定性良好。这一工作为MnO纳米材料向高性能储能器件的发展提供了新的方向。
Monodisperse spherical MnO nanocrystals (NCs) with a size of 22.5 nm were synthesized by the thermal decomposition of manganese oleate in the presence of oleic acid and 1-octadecene. The as-synthesized MnO NCs show superior electrochemical performances with a specific capacitance of 736.4 F g-1 at a current density of 1 A g-1 and retain 93.3% of initial specific capacitance after 5000 cycles. The MnO NC electrode was successfully assembled in an asymmetric supercapacitor as the cathode with an activated carbon (AC) electrode as the anode. The as-fabricated device can demonstrate remarkable performance with an energy density of 44.2 W h kg-1, a power density of 900 W kg-1, and excellent cycling stability. This work provides a new direction for MnO nanomaterials towards high-performance energy storage devices.