In this study, the effect of reduced graphene oxide (rGO) on interconnected Co₃O₄ nanosheets and the improved supercapacitive behaviors are reported. By optimizing the experimental parameters, we achieved a specific capacitance of ~1016.4 F g^-1 for the Co₃O₄/rGO/NF (nickel foam) system at a current density of 1 A g^-1. However, the Co₃O₄/NF structure without rGO only delivers a specific capacitance of ~520.0 F g^-1 at the same current density. The stability test demonstrates that Co₃O₄/rGO/NF retains ~95.5% of the initial capacitance value even after 3000 charge-discharge cycles at a high current density of 7 A g^-1. Further investigation reveals that capacitance improvement for the Co₃O₄/rGO/NF structure is mainly because of a higher specific surface area (~87.8 m² g^-1) and a more optimal mesoporous size (4–15 nm) compared to the corresponding values of 67.1 m² g^-1 and 6–25 nm, respectively, for the Co₃O₄/NF structure. rGO and the thinner Co₃O₄ nanosheets benefit from the strain relaxation during the charge and discharge processes, improving the cycling stability of Co₃O₄/rGO/NF.

在这项研究中，还原的氧化石墨烯（rGO）对互连的Co ₃ O ₄纳米片的影响和改善的超电容行为的报道。通过优化实验参数，我们实现的特定电容〜1016.4 F G ^-1用于CO ₃ ø ₄在1A g的电流密度/ RGO / NF（镍海绵）系统^-1。但是，没有rGO的Co ₃ O ₄ / NF结构在相同的电流密度下只能提供约520.0 F g ^-1的比电容。稳定性测试表明，Co ₃ O ₄ / rGO / NF保留了即使在7 A g ^-1的高电流密度下经过3000次充放电循环后，仍约为初始电容值的95.5％。进一步的研究表明，与Co ₃ O ₄ / rGO / NF结构相比，Co ₃ O ₄ / rGO / NF结构的电容改善主要是由于其比表面积较高（〜87.8 m ² g ^-1）和最佳介孔尺寸（4-15 nm）。Co ₃ O ₄ / NF结构的相应值分别为67.1 m ² g ^-1和6–25 nm 。rGO和更薄的Co ₃ O ₄纳米片受益于充放电过程中的应变松弛，提高了Co ₃ O ₄ / rGO / NF的循环稳定性。