In this work, the in-situ formation of MnMoO₄ nanoparticles and simultaneous encapsulation within the porous carbon nanofiber (CNF) matrix through electrospinning-carbonization-thermal annealing processes were carried out. The results of various spectroscopic and morphological analyses confirmed the successful formation of rectangular-shaped MnMoO₄ nanorods within the CNF matrix. The MnMoO₄@CNF hybrid yielded a maximum specific capacitance of 389.7 F/g at 0.1 A/g, which is 3-folds more than that of CNF (123.4 F/g). The MnMoO₄@CNF symmetric cell with an aqueous KOH electrolyte possessed a maximum energy density of 54.12 Wh/kg at a power density of 10 W/kg. The excellent capacitive performances of as-prepared MnMoO₄@CNF nanofibers could be ascribed to their high specific surface area (229.35 m²/g) with wide mesoporous distribution (3–13 nm) and enhanced reactivity of the nano-sized MnMoO₄ nanoparticles. The hybrid electrode demonstrated excellent cyclic stability with capacitance retention of 92.1% after 5000 cycles, suggesting restricted extrication of metal oxide from the CNF matrix during the charge-discharge process. A flexible solid-state asymmetric supercapacitor was assembled by using MnMoO₄@CNF hybrid mat as a positive electrode and activated carbon cloth as a negative electrode. The polymer gel electrolyte (PVA + KOH) was used as electrolyte-cum-separator. The as-prepared MnMoO₄@CNF//AC cell yielded a highest energy density of 37.46 Wh/kg and an equivalent power density of 278 W/kg. The present investigation could open new horizons in developing next-generation flexible solid-state supercapacitors for wearable electronics.

在这项工作中，通过静电纺丝-碳化-热退火工艺原位形成 MnMoO ₄纳米颗粒并同时封装在多孔碳纳米纤维 (CNF) 基质中。各种光谱和形态分析的结果证实了在 CNF 基质中成功形成了矩形 MnMoO ₄纳米棒。MnMoO ₄ @CNF 混合体在 0.1 A/g 时产生的最大比电容为 389.7 F/g，是 CNF (123.4 F/g) 的 3 倍。具有水性 KOH 电解质的 MnMoO ₄ @CNF 对称电池在 10 W/kg 的功率密度下具有 54.12 Wh/kg 的最大能量密度。制备的MnMoO ₄优异的电容性能@CNF 纳米纤维可归因于它们的高比表面积 (229.35 m ² /g)、宽介孔分布 (3–13 nm) 和纳米级 MnMoO ₄纳米粒子的增强反应性。混合电极表现出优异的循环稳定性，在 5000 次循环后电容保持率为 92.1%，表明在充放电过程中金属氧化物从 CNF 基质中的脱离受到限制。以MnMoO ₄ @CNF混合垫为正极，活性炭布为负极，组装了柔性固态非对称超级电容器。聚合物凝胶电解质（PVA + KOH）用作电解质兼隔膜。制备的 MnMoO ₄@CNF//AC 电池产生了 37.46 Wh/kg 的最高能量密度和 278 W/kg 的等效功率密度。目前的研究可以为开发用于可穿戴电子设备的下一代柔性固态超级电容器开辟新的视野。