【摘要】 通过简单的溶剂热法和煅烧法制备了MOF衍生的ZnO/NiO@C多孔纳米复合材料，采用傅里叶红外光谱(FT-IR)、扫描电镜(SEM)、X射线衍射(XRD)对其微观形貌和结构进行表征，利用X射线光电子能谱(XPS)分析了复合材料的元素组成，通过氮气吸附/脱附实验测试了复合材料的比表面积和孔径分布，结果表明：复合材料具有高比表面积和一定数量的介孔，在100 mA/g电流密度下，ZnO/NiO@C电极首次放电比容量为1 489.7 mAh/g，循环400次后的可逆比容量为1 078.0 mAh/g，容量保持率为72.4%。此外，通过不同倍率的充放电实验，电极的比容量可以恢复到初始倍率的75.28%，测试结果表明ZnO/NiO@C电极具有优异的循环性能和较好的倍率性能，良好的电化学性能是由于其多孔结构、高比表面积和丰富的电化学活性位点，降低了电荷的传递阻力，促进了离子的扩散，提高了倍率性能和循环稳定性。更多还原

【Abstract】 In this paper, MOF-derived ZnO/NiO@C porous nanocomposites were prepared by simple solvothermal method and calcination method, and their micromorphology and structure were characterized by Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM)and X-ray diffraction(XRD), the elemental composition of the composites was analyzed by X-ray photoelectron spectroscopy(XPS), and the specific surface area and pore size distribution of the composites were tested by nitrogen adsorption/desorption experiments. The results show that the composites have a high specific surface area and a certain number of mesopores. At 100 mA/g current density, the specific capacity of ZnO/NiO@C electrode is 1 489.7 mAh/g for the first discharge, the reversible capacity is 1 078.0 mAh/g after 400 cycles, and the capacity retention rate is 72.4%, in addition, the specific capacity of the electrode can be restored to 75.28% of the initial magnification through the charge-discharge experiment of different magnifications, and the test results show that the ZnO/NiO@C electrode has excellent cycling performance and good rate performance. The favourable electrochemical performance can be attributed to the material’s porous structure, high specific surface area and abundance of electrochemically active sites. These characteristics reduce the resistance to charge transfer, facilitate ion diffusion and improve the material’s multiplicity performance and cycling stability.更多还原