MnO2@NiCo2O4核-壳异质结构的构筑及电化学性能和催化性能

Construction of MnO2@NiCo2O4 Core-Shell Heterostructure and the Property of Electrochemical and Catalytic

采用2步水热法制备出1种以NiCo2O4纳米线为核,MnO2纳米颗粒为壳的三维结构MnO2@NiCo2O4@Ni-foam复合材料。通过X射线衍射(XRD),扫描电子显微镜(SEM)对复合催化剂的结构和形貌进行表征;通过循环伏安法(CV),恒流充放电性能(GCD)和电化学阻抗谱(EIS)来进行表征复合材料的电化学性能;通过O3催化降解装置对复合材料的催化性能进行研究。结果表明:MnO2@NiCo2O4@Ni-foam复合材料在频率范围为0.1~10000Hz时阻抗较低;通过降解实验发现,MnO2@NiCo2O4@Ni-foam对O3的降解率高于50%,表现出良好的催化效果。这表明MnO2@NiCo2O4@Ni-foam复合材料在降解O3,净化空气方面有广阔的应用前景。

A three-dimensional structure MnO2@NiCo2O 4@Ni-foam composite with NiCo2O4 nanowires as core and MnO2 nanoparticles as shell was prepared by two-step hydrothermal method.The structure and morphology of the composite catalyst were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Cyclic voltammetry(CV),constant current charge and discharge performance(GCD)and electrochemical impedance spectroscopy(EIS)were performed.The electrochemical performance of the composite was characterized and the catalytic performance of the composite by ozone catalytic degradation device was investigated.The results showed that the MnO2@NiCo2O@Ni-foam composite had lower impedance in the frequency range of 0.1-10 000 Hz.It was found by degradation experiments that the degradation rate of MnO2@NiCo2O4@Ni-foam to ozone was higher than 50%,showing good catalytic effect,which indicated that MnO2@NiCo2O4@Ni-foam composite had broad application prospects in degrading ozone and purifying air.