High-performance asymmetric supercapacitors based on monodisperse MnO nanocrystals with high energy densities†,Nanoscale

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High-performance asymmetric supercapacitors based on monodisperse MnO nanocrystals with high energy densities†
Nanoscale ( IF 5.8 ) Pub Date : 2018-08-10 00:00:00 , DOI: 10.1039/c8nr04541k
Menggang Li _{1,

2,

3,

4,

5} , Wenjuan Lei _{1,

2,

3,

4,

5} , Yongsheng Yu _{1,

2,

3,

4} , Weiwei Yang _{4,

5,

6,

7,

8} , Ji Li _{1,

2,

3,

4} , Dafa Chen _{4,

5,

6,

7,

8} , Shichong Xu _{1,

2,

3,

4} , Ming Feng _{1,

2,

3,

4} , Haibo Li _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

基于具有高能量密度的单分散MnO纳米晶体的高性能不对称超级电容器†

在油酸和1-十八碳烯的存在下，通过油酸锰的热分解，合成了尺寸为22.5 nm的单分散球形MnO纳米晶（NCs）。合成后的MnO NCs具有优异的电化学性能，在1 A g ^-1的电流密度下的比电容为736.4 F g ^-1，在5000次循环后仍保持93.3％的初始比电容。MnO NC电极成功地组装在不对称超级电容器中作为阴极，活性炭（AC）电极作为阳极。所制造的设备可以表现出卓越的性能，其能量密度为44.2 W h kg ^-1，功率密度为900 W kg ^-1，以及出色的循环稳定性。这项工作为MnO纳米材料向高性能储能装置提供了新的方向。

更新日期：2018-08-10

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