Abstract A binder-free nanocomposite consisting of ZnO nanoparticles (NPs) grown directly on graphene sheets by electrospraying was fabricated for use as an electrode material in supercapacitors. The optimal concentrations of graphene and ZnO NPs were determined from the capacitive characteristics of the composite. Scanning electron microscopy confirmed that the ZnO NPs grew in a uniformly distributed manner on the graphene sheets and that they exhibited negligible agglomeration. Further, X-ray diffraction analysis confirmed that ZnO growth was preferentially oriented along (100) plane in the ZnO/graphene composite. A symmetric supercapacitor fabricated using this composite exhibited an energy density of 67 mWh·cm−3 and power density of 6000 mW·cm−3. The composite also showed good long-term cycling performance, retaining 90% of its capacitance after 1000 galvanostatic charge/discharge cycles.

中文翻译：

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用于超级电容器的用 ZnO 纳米颗粒装饰的电喷涂石墨烯

摘要 制备了一种不含粘合剂的纳米复合材料，该复合材料由通过电喷涂直接生长在石墨烯片上的 ZnO 纳米颗粒 (NPs) 组成，用作超级电容器中的电极材料。石墨烯和 ZnO NPs 的最佳浓度由复合材料的电容特性确定。扫描电子显微镜证实 ZnO NPs 在石墨烯片上以均匀分布的方式生长，并且它们的团聚可以忽略不计。此外，X 射线衍射分析证实，在 ZnO/石墨烯复合材料中，ZnO 生长优先沿 (100) 面取向。使用这种复合材料制造的对称超级电容器的能量密度为 67 mWh·cm-3，功率密度为 6000 mW·cm-3。该复合材料还表现出良好的长期循环性能，