基于二氧化锰和金属有机框架化合物协同作用构建的立体复合阵列超级电容器电极

以硝酸锌、硝酸锰和2-甲基咪唑为原料，采用多步计时电位法和静置法，制备了氧化锌-二氧化锰-金属框架有机化合物（ZnO-MnO2-MOF）复合材料阵列电极。 通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X光电子能谱(XPS)和X射线衍射(XRD)等技术手段对比分析了该复合材料的结构和形貌，并采用循环伏安法、恒电流充放电、电化学阻抗和循环充放电法研究了电极的电化学性能。 结果表明，与氧化锌-二氧化锰（ZnO-MnO2）复合材料阵列电极（Csp=121 F/g,j=2.5 A/g）相比，由于二氧化锰和金属有机框架化合物（MOF）的协同作用，修饰MOF后的ZnO-MnO2-MOF复合材料阵列电极具有较小的内阻，电容器比电容（Csp=146 F/g,j=2.5 A/g）性能提升了20%，具有更好的可逆法拉第反应和稳定性。

Three-dimensional Nanocomposite Array Supercapacitor Electrode Based on the Synergistic Effects of Manganese Dioxide and Metallorganic Frameworks

ZnO-MnO2-MOF(metallorganic frameworks) nanocomposite array electrode was fabricated by multi-step chronopotentiometry and standing without disturbance, in which zinc nitrate, manganese nitrate and hexamethylenetetramine were the raw materials. The morphology and structure of the composite were investigated by scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, and X-ray diffraction, respectively. The electrochemical properties of the electrode were studied by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in 0.5 mol/L sodium sulfate. The results show that, in comparison with ZnO-MnO2 composite（Csp=121 F/g, j=2.5 A/g）, ZnO-MnO2-MOF nanocomposite array electrode shows a lower internal resistance, a higher reversible Faradic reaction, and a better rate performance owing to synergistic effects between MnO2 and MOF, and its specific capacitance（Csp=146 F/g, j=2.5 A/g） is 20% higher than that of the ZnO-MnO2 composite.