Core-shell assembly of CoO@NiO-ZnO nanoarrays as battery-type electrodes for high-performance supercapatteries

• Published in: Inorganic chemistry frontiers Vol. 6; no. 9; pp. 2481 - 2487
• Main Authors: Chen, Hongmei, Zhou, Jiaojiao, Li, Qin, Tao, Kai, Yu, Xianbo, Zhao, Shihang, Hu, Yaoping, Zhao, Wenna, Han, Lei
• Format: Journal Article
• Published: 10.09.2019
• ISSN: 2052-1553
• DOI: 10.1039/c9qi00607a

Core-shell Co 3 O 4 @NiO-ZnO nanocomposite arrays are successfully fabricated by annealing metal-organic framework assisted precursors and are investigated as binder-free battery-type electrodes for supercapacitors with a remarkably enhanced performance. The Co 3 O 4 @NiO-ZnO electrode delivers ultrahigh areal capacitance/capacity (4678 mF cm −2 /1965 C cm −2 /302 C g −1 at a current density of 2 mA cm −2 ) and excellent cycling stability (83% retention over 10 000 cycles), due to multiple advantages offered by the intriguing core-shell structure, such as large surface area, fast electrolyte penetration, efficient charge transport, highly exposed active sites, and the synergistic effect between them. Moreover, an assembled supercapattery using Co 3 O 4 @NiO-ZnO arrays as a positive electrode and active carbon as a negative electrode yields a high energy density of 162 μW h cm −2 at a high power density of 1.676 mW cm −2 and a superior capacitance retention of 93% over 10 000 cycles. These excellent results indicate that this efficient strategy can be extended to prepare core-shell-type multi-metallic oxide arrays for high-performance supercapatteries. Core-shell Co 3 O 4 @NiO-ZnO nanoarrays are fabricated by annealing metal-organic framework assisted precursors and investigated as battery-type electrode for supercapattery.