The design and fabrication of scalable energy storage systems are crucial for portable applications, demanding advanced materials through large-scale and facile processing. In this report, an asymmetric solid-state pseudocapacitor (ASPC) is assembled using a core–shell NiCoO@MnO composite and solution-processed nitrogen-doped graphene (-GP) as the positive and negative electrodes, respectively. With interconnected porous structures, the electrodes based on -GP and NiCoO@MnO offer high specific capacitance and rate capability, broad operation voltage, and a binder-free design with no added conductive agent. With these benefits, the ASPC with a PVA-KOH electrolyte exhibits a specific capacitance of 103.3F g at 1 A/g and exceptional energy density of 36.73 Wh kg at a power density of 792 W kg. In addition, the specific capacitance retention reaches 90.9 % after 5000 cycles, indicating excellent cycling stability. In the broader context of solid-state supercapacitors based on solution-processed graphene, this ASPC exhibits highly competitive performance, establishing it as a promising candidate for advanced energy storage.

中文翻译：

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基于NiCo2O4@MnO2阴极和N掺杂石墨烯阳极的高性能非对称赝电容器

可扩展储能系统的设计和制造对于便携式应用至关重要，需要通过大规模和简便的加工来使用先进材料。在本报告中，使用核壳NiCoO@MnO复合材料和溶液处理的氮掺杂石墨烯（-GP）分别作为正极和负极组装了不对称固态赝电容器（ASPC）。基于-GP和NiCoO@MnO的电极具有互连的多孔结构，具有高比电容和倍率性能、宽工作电压以及无需添加导电剂的无粘合剂设计。凭借这些优势，采用 PVA-KOH 电解质的 ASPC 在 1 A/g 时表现出 103.3F g 的比电容，在 792 W kg 的功率密度下表现出 36.73 Wh kg 的出色能量密度。此外，5000次循环后比电容保持率达到90.9%，表现出优异的循环稳定性。在基于溶液加工石墨烯的固态超级电容器的更广泛背景下，该 ASPC 表现出极具竞争力的性能，使其成为先进储能的有前途的候选者。