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Fabrication of hierarchical MnMoO4⋅H2O@MnO2 core-shell nanosheet arrays on nickel foam as an advanced electrode for asymmetric supercapacitors
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2017-11-20 , DOI: 10.1016/j.cej.2017.11.085
Jiasheng Xu , Yudong Sun , Mingjun Lu , Lin Wang , Jie Zhang , Jianhua Qian , Xiaoyang Liu

The hierarchical MnMoO4⋅H2O@MnO2 core−shell nanosheet arrays on nickel foam have been successfully fabricated by a mild two−step hydrothermal method. MnMoO4⋅H2O nanosheet arrays is synthesized by adding sodium molybdates solution into the manganese chloride solution containing a nickel foam, and followed by the first step hydrothermal treatment. The MnMoO4⋅H2O@MnO2 is fabricated by the second step hydrothermal treatment of above−step product in potassium permanganate solution. The core−shell nanosheet structure significantly increases the amount of active sites for redox reactions, shortens the diffusion pathway for ions and facilitates the effective penetration of the electrolytes for energy storage application. The MnMoO4⋅H2O@MnO2 as electrode material reaches to a high specific capacitance of 3560.2 F g−1 at a current density 1 A g−1, as well as advantageous cycling stability (84.1% capacitance retention after 10000 cycles). Furthermore, an asymmetric supercapacitor is also assembled, exhibiting an energy density of 45.6 Wh kg-1 at a power density of 507.3 W kg-1. The MnMoO4⋅H2O@MnO2 is a promising electrode material for supercapacitors.



中文翻译:

分层MnMoO的制造4 ⋅H 2 ö@的MnO 2的芯-壳纳米片阵列上泡沫镍作为不对称超级电容器的电极先进

分层MnMoO 4 ⋅H 2 ö@的MnO 2上镍泡沫芯-壳纳米片阵列都通过一个温和的两步水热法已成功地制造。通过将钼酸钠溶液添加到含有镍泡沫的氯化锰溶液中,然后进行第一步水热处理,合成MnMoO H 2 O纳米片阵列。所述MnMoO 4 ⋅H 2 ö@的MnO 2通过在高锰酸钾溶液中对上述产物进行第二步水热处理而制成。核-壳纳米片结构显着增加了氧化还原反应的活性位点数量,缩短了离子的扩散途径,并促进了电解质在能量存储应用中的有效渗透。所述MnMoO 4 ⋅H 2 ö@的MnO 2的电极材料达到的3560.2 F G高的比电容-1处的电流密度1 A G -1,以及有利的循环稳定性(84.1%电容10000次循环后保留) 。此外,还组装了不对称超级电容器,其能量密度为45.6 Wh kg- 1在507.3 W kg- 1的功率密度下。MnMoO H 2 O @ MnO 2是一种有前途的超级电容器电极材料。

更新日期:2017-11-20
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