Abstract Porous nanowires (NWs) and nanoflowers (NFs) type structures of nickel cobaltite (NiCo2O4) were synthesized on rGO sheet (rGO@NiCo2O4) as supercapacitor electrode material. The synthesized materials are characterized using different experimental techniques. The growth of NiCo2O4 over rGO sheet is confirmed by the appearance of D and G bands in the Raman spectrum. The rGO@NiCo2O4 NFs electrode revealed relatively high value of specific capacity (436 C/g at current density of 1 A/g) with good capacity retention compared to other electrodes. The improved electrochemical activity of the rGO@NiCo2O4 NFs electrode may be due to the porous nanostructure of NiCo2O4 on rGO sheet. The rGO sheets provide easy access to ions, large surface area and large active sites with stable structural integrity. The Nyquist plot of the rGO@NiCo2O4 NFs electrode shows relatively low values of Rs and Rct compared to other electrodes, which essentially refer to its improved electrical conductivity. Thus, the rGO@NiCo2O4 NFs may be used as a supercapacitor electrode material for device fabrication.

中文翻译：

---

用于高性能超级电容器的在 rGO 片上生长的 NiCo2O4 多孔纳米结构的简便合成

摘要 在作为超级电容器电极材料的 rGO 片材 (rGO@NiCo2O4) 上合成了钴酸镍 (NiCo2O4) 的多孔纳米线 (NWs) 和纳米花 (NFs) 型结构。合成材料使用不同的实验技术进行表征。NiCo2O4 在 rGO 片上的生长由拉曼光谱中 D 和 G 带的出现证实。与其他电极相比，rGO@NiCo2O4 NFs 电极显示出相对较高的比容量值（在 1 A/g 的电流密度下为 436 C/g），并且具有良好的容量保持率。rGO@NiCo2O4 NFs 电极电化学活性的提高可能是由于 rGO 片上 NiCo2O4 的多孔纳米结构。rGO 薄片可轻松获取离子、大表面积和大活性位点，并具有稳定的结构完整性。rGO@NiCo2O4 NFs 电极的奈奎斯特图显示，与其他电极相比，Rs 和 Rct 值相对较低，这主要是指其改善的导电性。因此，rGO@NiCo2O4 NFs 可用作器件制造的超级电容器电极材料。