Preparation method and application of ZnO-coated ZnNiCo-LDH composite material

The invention provides a preparation method of a ZnO-coated ZnNiCo-LDH composite material, which comprises the following steps: taking zinc acetate, sodium citrate and sodium hydroxide as raw materials, synthesizing a ZnO solid through stirring, then taking the ZnO solid as a zinc source, Co (NO3) 2.6 H2O as a cobalt source and 2-methylimidazole as a ligand, carrying out oil bath heating to obtain ZnO-coated ZIF-8/ZIF-67, and then carrying out cobalt etching by using Co (NO3) 2.6 H2O and Ni (NO3) 2.6 H2O to obtain the ZnO-coated ZnNiCo-LDH composite material. Applications are also provided for use in the positive electrode of a supercapacitor. The composite material prepared by the invention has the electrochemical properties of high specific capacitance, rate capability and good cycling stability, and can be widely applied to the positive electrode of a super capacitor. 本发明提供了一种ZnO@ZnNiCo-LDH复合材料的制备方法，该方法以醋酸锌、柠檬酸钠、氢氧化钠为原料，通过搅拌合成ZnO固体，然后以ZnO固体为锌源，Co(NO3)2·6H2O为钴源，2-甲基咪唑为配体，油浴加热得到ZnO@ZIF-8/ZIF-67，再使用Co(NO3)2·6