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Synthesis of MnCo2O4@MnCo2S4 core/shell micro-nanostructures on Ni foam for high performance asymmetric supercapacitors
- Wang, Xin, Xu, Lei, Song, Kun, Yang, Rui, Jia, Lihua, Guo, Xiangfeng, Jing, Xiaoyan, Wang, Jun
- Colloids and surfaces 2019 v.570 pp. 73-80
- aqueous solutions, capacitance, carbon nanotubes, electrodes, energy density, foams, hot water treatment, nickel, oxygen, sulfur, synergism
- A flower-like of MnCo2O4 micro-nanostructures on Ni foam was prepared using a calcination-process assisted hydrothermal method. Following immersion of the MnCo2O4 precursor in NaHS aqueous solution, S2+ reaches the outer surface of MnCo2O4, and sulfur replaces the oxygen to form MnCo2S4, and hierarchical MnCo2O4@MnCo2S4 core/shell is generated. The as-prepared core-shell micro-nanostructure revealed its component advantages and a synergistic effect for electrode materials of supercapacitors. The materials deliver a specific capacitance of 1933.33 F·g−1 at a current density of 1 A·g−1 with a superior rate performance in a three-electrode system. An asymmetric supercapacitor was assembled with MnCo2O4@MnCo2S4 core/shell micro-nanostructure arrays as positive electrode and carbon nanotubes (CNTs) as negative electrode. The device delivers a high energy density of 50.75 W·h·kg−1 at a power density of 1260 W·kg−1 and an excellent cycling stability of 96% capacitance retention after 5000 cycles.