摘要：本文采用水热法结合煅烧处理制备出氧化锌-氧化亚钴（ZnO-CoO）复合材料，同时探究水热时间和水热温度对ZnO-CoO的形貌和电化学性能的影响，确定制备ZnO-CoO的最佳条件：水热时间为8h，水热温度为150℃。以上述最佳条件为反应条件，在原料中添加PVP，其他步骤不变，制备ZnO-CoO@C复合材料，对其进行形貌表征和电化学性能测试，并探究PVP添加量的影响。利用X射线衍射（XRD）、拉曼光谱、扫描电镜

（SEM）、透射电镜（TEM）等，对样品的形貌与结构进行分析。在2MKOH电解液中进行电化学测试，结果表明：最佳的ZnO-CoO@C复合材料在电流密度为0.5Ag-1时，比电容为196.4Fg-1；在2Ag-1的电流密度下，循环25000圈后，比电容的仍有很高的保持率，为97.5%，显示了ZnO-CoO@C复合材料极其卓越的循环稳定性。为了进一步提高复合材料的电化学性能，我们以ZnO-CoO@C前驱体为原料，通过硅烷偶联剂与氧化石墨烯（GO）偶联，结合煅烧处理制备ZnO-CoO@C/RGO复合材料，并对其电化学性进行了系统探究。

关键词氧化锌氧化亚钴电化学性能氧化石墨烯

毕业设计说明书外文摘要

本文采用水热法结合煅烧处理制备出氧化锌-氧化亚钴（ZnO-CoO）复合材料，同时 探究水热时间和水热温度对 ZnO-CoO 的形貌和电化学性能的影响，确定制备 ZnO-CoO 的最佳条件：水热时间为 8 h，水热温度为 150 ℃。以上述最佳条件为反应条件，在原料 中添加 PVP，其他步骤不变，制备 ZnO-CoO@C 复合材料，对其进行形貌表征和电化学 性能测试，并探究 PVP 添加量的影响。利用 X 射线衍射（XRD）、拉曼光谱、扫描电镜

（SEM）、透射电镜（TEM）等，对样品的形貌与结构进行分析。在 2 M KOH 电解液中 进行电化学测试，结果表明：最佳的 ZnO-CoO@C 复合材料在电流密度为 0.5 A g-1 时， 比电容为 196.4 F g-1；在 2 A g-1 的电流密度下，循环 25 000 圈后，比电容的仍有很高的保 持率，为 97.5%，显示了 ZnO-CoO@C 复合材料极其卓越的循环稳定性。为了进一步提 高复合材料的电化学性能，我们以 ZnO-CoO@C 前驱体为原料，通过硅烷偶联剂与氧化 石墨烯（GO）偶联，结合煅烧处理制备 ZnO-CoO@C/RGO 复合材料，并对其电化学性 进行了系统探究。

关键词  氧化锌  氧化亚钴  电化学性能  氧化石墨烯

毕 业 设 计 说 明 书 外 文 摘 要

Title Synthesis and Electrochemical Performance of Cobalt-based

  Oxide/Carbon Composite Materials

Abstract

Zinc-cobalt oxides (ZnO-CoO) composite materials were synthesized by a facile hydrothermal method followed by an annealing process. The influences of reaction conditions on the morphology and electrochemical properies of zinc-cobalt oxides were also investigated.The optimal conditions were as follows: the hydrothermal time was 8 h, the hydrothermal temperature was 150 ℃.In a similar way, ZnO-CoO@C was prepared with the addition of PVP under the above optimal conditions. The morphology and structure of samples were analyzed by X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM), transmission electron microscope (TEM), etc. Electrochemical tests were carried out in 2 M KOH electrolyte which revealed that the specific capacitance of ZnO/CoO@C was 196.4 F g-1 at the current density of 0.5 A g-1, and the retention of specific capacitance still reached as high as 97.5% after 25 000 cycles at the current density of 2 A g-1, indicating its extremely remarkable cycling stability. In order to improve the electorchemical properties, the precursor of ZnO/CoO@C were linked with graphene oxide by saline coupling agent. Then ZnO-CoO@C/RGO composite materials were prepared after a subsequent annealing treatment. We systematically investigated the electrochemical properties of ZnO-CoO@C/RGO composite materials as well.