Mn3O4/Ni(OH)2 nanocomposite as an applicable electrode material for pseudocapacitors

• Published in: Electrochimica acta Vol. 249; pp. 155 - 165
• Main Authors: Wang, Hong-Yan, Li, Deng-Gong, Zhu, Hui-Ling, Qi, Yong-Xin, Li, Hui, Lun, Ning, Bai, Yu-Jun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.09.2017
• Subjects: Doping; Electrode material; Nanocomposite; Pseudocapacitor; Nanocomposite; Electrode material; Pseudocapacitor; Doping
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.08.015

[Display omitted] •Mn3O4/Ni(OH)2 composites were simply synthesized by a hydrothermal method.•Mn-doped Ni(OH)2 and Ni-doped Mn3O4 enhance the conductivity of the composite.•The Mn3O4/Ni(OH)2 supercapacitor (SC) electrode exhibits excellent cyclability.•The Mn3O4/Ni(OH)2//active carbon reveals superior energy and power density. Mn3O4/Ni(OH)2 nanocomposites are simply synthesized by a hydrothermal reaction between MnCl2.4H2O, NiCl2.6H2O and NaOH at 200°C. Compared with the individual Ni(OH)2 and Mn3O4 prepared under the same conditions, the Mn3O4/Ni(OH)2 composite hydrothermally treated for 5h achieves excellent specific capacitance (707Fg−1 at 1Ag−1 in 1M KOH electrolyte) and remarkable long-term cycling stability (retaining a capacitance retention of 89% after 2000 cycles at 2Ag−1). Meanwhile, the asymmetric supercapacitor constructed by the Mn3O4/Ni(OH)2 composite and active carbon delivers an energy density of 17.8Whkg−1 at a power density of 162Wkg−1. The outstanding performance is attributable to the synergistic compositing effect of Mn3O4 and Ni(OH)2, yielding not only the mutual doping of Mn3+ in Ni(OH)2 and Ni2+ in Mn3O4 to improve the electronic conductivity of the Mn3O4/Ni(OH)2 composite but also the suitable mesoporous structure for electrolyte transfer. Thus the Mn3O4/Ni(OH)2 composites will be alternative candidates as practical electrode materials for pseudocapacitors.