Hierarchical ZnO@MnO2 Core-Shell Pillar Arrays on Ni Foam for Binder-Free Supercapacitor Electrodes

• Published in: Electrochimica acta 2015-01, Vol.152, p.172-177
• Main Authors: Huang, Ming, Li, Fei, Zhao, Xiao Li, Luo, Da, You, Xue Qiu, Zhang, Yu Xin, Li, Gang
• Format: Article
• Language: English
• Subjects: Core-shell; Hierarchical; Manganese dioxide; Supercapacitors; Zinc oxide
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2014.11.127

[Display omitted] •Ultrathin manganese oxides nanosheets were uniformly decorated on ZnO pillar arrays.•Advanced binder-free electrodes: hierarchical ZnO@MnO2 arrays on Ni foam.•The novel architecture exhibited a high capacitance of 423.5Fg−1.•Excellent cycling stability: 92% capacitance retention after 3000 cycles. Hierarchical ZnO@MnO2 core-shell pillar arrays on Ni foam have been fabricated by a facile two-step hydrothermal approach and further investigated as the binder-free electrode for supercapacitors. The core-shell hybrid nanostructure is achieved by decorating ultrathin self-standing MnO2 nanosheets on ZnO pillar arrays grown radically on Nickel foam. This unique well-designed binder-free electrode exhibits a high specific capacitance (423.5Fg−1 at a current density of 0.5Ag−1), and excellent cycling stability (92% capacitance retention after 3000 cycles). The improved electrochemical results show that the ZnO@MnO2 core-shell nanostructure electrode is promising for high-performance supercapacitors. The facile design of the unique core-shell array architectures provides a new and effective approach to fabricate high-performance binder-free electrode for supercapacitors.