Fabricating a Mn₃O₄/Ni(OH)₂ Nanocomposite by Water-Boiling Treatment for Use in Asymmetric Supercapacitors as an Electrode Material
2018
He, Qian-Qian | Wang, Hong-Yan | Lun, Ning | Qi, Yong-Xin | Liu, Jiu-Rong | Feng, Jin-Kui | Qiu, Jun | Bai, Yu-Jun
The electrode material is the key factor for developing asymmetric supercapacitors. A simple water-boiling treatment was adopted to fabricate a Mn₃O₄/Ni(OH)₂ nanocomposite on a large scale, which exhibited a splendid electrochemical performance with a boiling time of 3 h, achieving a capacitance of 742 F g–¹ at 1 A g–¹. When assembling the asymmetric capacitor with the Mn₃O₄/Ni(OH)₂ composite and activated carbon separately as positive and negative electrodes, a capacitance of 43 F g–¹ was attained at 0.2 A g–¹ with an energy density of 15.3 Wh kg–¹ at a power density of 168.8 W kg–¹. This simple, reproducible, ecofriendly, and large-scale fabrication method is practical for preparing other transition metal oxides for the purpose of use in asymmetric supercapacitors with superior properties.
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