Transition metal sulfides have attracted considerable attention due to their excellent electrochemical performance for supercapacitors. Herein, we prepared a Co₃S₄/CoMo₂S₄ (Co−Mo−S) composite on reduced graphene oxide/Ni foam (RGO/NF) with unique flower‐like morphology through a carefully time‐controlled sulfurization process. It was found that the vulcanization time has a great influence on the morphology and electrochemical properties of the composites. After 3 hours of vulcanization, the as‐prepared Co₃S₄/CoMo₂S₄@RGO/NF electrode exhibited a superior specific capacitance of 2530.4 F g⁻¹ at a current density of 1 A g⁻¹, as well as excellent cycling stability with 78.8 % retention of the initial capacitance even after 6,000 cycles at a current density of 10 A g⁻¹. An asymmetric device was assembled employing the Co₃S₄/CoMo₂S₄@RGO/NF composite as a positive electrode and activated carbon (AC) as a negative electrode. The device delivered a maximum energy density of 59.0 Wh kg⁻¹ at a power density of 640 W kg⁻¹ and a high cycling performance (90.7 % capacitance retention after 6,000 cycles). These results demonstrate the promising potential of Co−Mo−S@RGO/NF as binder‐free, high‐performance electrode in renewable energy storage systems.

中文翻译：

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具有增强的电化学电容性能的镍泡沫还原石墨烯复合物上的花状Co-Mo-S的形成

过渡金属硫化物因其对超级电容器的出色电化学性能而备受关注。在这里，我们通过精心控制的时间控制的硫化过程，在还原的氧化石墨烯/镍泡沫（RGO / NF）上制备了具有独特花状形态的Co ₃ S ₄ / CoMo ₂ S ₄（Co-Mo-S）复合材料。发现硫化时间对复合材料的形貌和电化学性能有很大的影响。硫化3小时后，制成的Co ₃ S ₄ / CoMo ₂ S ₄ @ RGO / NF电极表现出2530.4 F g ^-1的优良比电容。电流密度为1 A g ^-1时，即使在电流密度为10 A g ^{-1的情况下}进行6,000次循环后，仍具有出色的循环稳定性，并保持了78.8％的初始电容。使用Co ₃ S ₄ / CoMo ₂ S ₄ RGO / NF复合材料作为正电极，活性炭（AC）作为负电极，组装了不对称器件。该设备在640 W kg ^-1的功率密度下提供了59.0 Wh kg ^-1的最大能量密度以及较高的循环性能（6,000个循环后的电容保持率为90.7％）。这些结果表明，Co-Mo-S @ RGO / NF在可再生能源存储系统中作为无粘结剂，高性能电极的潜力巨大。