Flocculus-like NiO spheres were prepared through controling synthetic conditions,and then combined with flower-like MnO2 to obtain MnO2/NiO composite materials with a core-shell structure.The microscopic morphology and structure of the composites were characterized by XRD,SEM,and EDS.The electrochemical performance of the electrode materials was systematically analyzed using a three-electrode system with 6mol/L KOH as the electrolyte through various testing methods such as cyclic voltammetry,galvanostatic charge/discharge,and electrochemical impedance spectroscopy.The results showed that when the current density was 0.5A/g,the specific capacitances of pure flocculus-like NiO,pure flower-like MnO2,and the “core-shell” structured MnO2@NiO composites were 252F/g,263F/g,and 627F/g,respectively,indicating that the specific capacitances of the core-shell structured MnO2@NiO composites was significantly higher than that of the unitary materials.The specific capacitance retention rate of the core-shell structured MnO2@NiO binary composite was 82% at 5A/g after 1000 cycles,which was significantly improved compared with pure flower-like MnO2.High specific capacitance and good cycling stability indicated that the core-shell structure of MnO2@NiO enhanced the effective utilization of active materials due to the synergistic effect of both components,and the stability of the flocculus-like NiO substrate helped to improve the cycling stability of the composites at high current densities.
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基金资助
国家自然科学基金面上项目(51472166)
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