Three-Dimensional Co3O4 Nanowires@Amorphous Ni(OH)2 Ultrathin Nanosheets Hierarchical Structure for Electrochemical Energy Storage

• Published in: Electrochimica acta 2016-02, Vol.191, p.758-766
• Main Authors: Zhang, Xudong, Xiao, Jinlan, Zhang, Xueyan, Meng, Yan, Xiao, Dan
• Format: Article
• Language: English
• Subjects: asymmetric supercapacitor; Co3O4; core/shell nanowire arrays; energy storage; Ni(OH)2
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2016.01.159

[Display omitted] •Electrodeposition of Ni(OH)2 on Co3O4 is simple to prepare Co3O4@Ni(OH)2 NAs.•Amorphous Ni(OH)2 ultrathin nanosheets improve the contact area with electrolyte.•Co3O4@Ni(OH)2 NAs show synergistic effect of Co3O4 nanowires and Ni(OH)2 nanosheets.•The battery-type faradaic material displays excellent electrochemical performance.•The asymmetric supercapacitor exhibits good capacitance, rate and cycling capabilities. A Co3O4@Ni(OH)2 core/shell nanowire arrays (NAs) material is synthesized and successfully applied to the energy storage device. Combining the performance advantages of Co3O4 nanowires and Ni(OH)2 nanosheets, Co3O4@Ni(OH)2 NAs exhibit a remarkable specific capacity (SC) of 912Cg−1at the current density of 1Ag−1, good rate capability and cycling stability. A asymmetric supercapacitor based on Co3O4@Ni(OH)2 NAs positive electrode and active carbon (AC) negative electrode shows a broad operation voltage of 1.6V and a good specific capacitance of 140Fg−1at 1Ag−1. All of the electrolyte used in this work is 6M KOH aqoeous solution. Furthermore, the Co3O4@Ni(OH)2//AC asymmetric supercapacitor represents prominent specific energy (49.8Whkg−1at 801Wkg−1) and specific power (16.1kWkg−1at 28.1Whkg−1). So, those excellent properties of Co3O4@Ni(OH)2 NAs focus more interest on similar core/shell materials.