Nitrogen-doped mesoporous carbon spheres (NMCSs) decorated with NiCo alloy nanoparticles (NiCo/NMCS) were prepared and examined for their prospective role as high-performance electrode materials. The average size and BET surface of the NMCSs are 488.1 nm and 660.9 mg. The N content of the NMCSs and NiCo/NMCS-50 (NMCSs with 50 wt% of NiCo alloy nanoparticles (NPs)) was 1.49 wt% and 2.9 wt%, respectively. The NiCo alloy NPs, with an average diameter of 9.6 nm, were evenly incorporated into NMCSs. The NiCo/NMCS-50 exhibited a specific capacitance of 585 F g when tested in a 6 M KOH solution at a current density of 1 A/g. The superior electrochemical performance of NiCo/NMCS-50 is attributed to the synergistic effect of mesoporous carbon structure and NiCo alloy NPs by improving redox-related mass transport and electron transfer. Symmetric supercapacitor devices assembled using two NiCo/NMCS-50 electrodes had a maximum energy density of 30.0 Wh kg at a power density of 187.5 W kg with notable cycling stability, maintaining 60.1 % of capacitance, up to 5,000 cycles. These results suggest that NiCo/NMCS composites have significant potential for utilization in high-energy storage applications.

中文翻译：

---

NiCo合金纳米颗粒修饰的氮掺杂介孔碳球用于高性能电化学超级电容器

制备了用镍钴合金纳米粒子（NiCo/NMCS）装饰的氮掺杂介孔碳球（NMCS），并检查了其作为高性能电极材料的前景。 NMCS 的平均尺寸和 BET 表面积分别为 488.1 nm 和 660.9 mg。 NMCS 和 NiCo/NMCS-50（含有 50 wt% NiCo 合金纳米颗粒 (NP) 的 NMCS）的 N 含量分别为 1.49 wt% 和 2.9 wt%。平均直径为 9.6 nm 的 NiCo 合金 NP 均匀地掺入 NMCS 中。当在 6 M KOH 溶液中以 1 A/g 的电流密度进行测试时，NiCo/NMCS-50 表现出 585 F g 的比电容。 NiCo/NMCS-50的优异电化学性能归因于介孔碳结构和NiCo合金纳米粒子通过改善氧化还原相关的质量传输和电子传递的协同效应。使用两个 NiCo/NMCS-50 电极组装的对称超级电容器器件在功率密度为 187.5 W kg 时的最大能量密度为 30.0 Wh kg，并且具有显着的循环稳定性，在高达 5,000 次循环时保持 60.1% 的电容。这些结果表明 NiCo/NMCS 复合材料在高能量存储应用中具有巨大的利用潜力。