Abstract Nitrogen functionalized graphitic carbon (NGC), aside from being a distinctive support material for catalyst integration, is also intrinsically active for various electrochemical reactions especially in energy storage and conversion devices. Given the admirable conductivity and graded pore structure, the strategy of hybridizing metal oxides with NGC skeleton is reckoned to be highly compelling in the design of electrode materials. In this work, carboxy methylcellulose and melamine derived – Co3O4 NGC is used as an active electrode material for high performance asymmetric supercapacitors (ASC). The synthesized Co3O4 NGC exhibits microglobules with mesoporous network and maximum surface area of 445.3 m2 g−1 at 77 K. A solid state ASC is fabricated with activated carbon and Co3O4 NGC microglobules as negative and positive electrodes, respectively based on charge balancing theory, delivering ultra-high capacitance (128.43 F. g−1), energy density (45.66 Wh.kg−1) and power density (399.9 W.kg−1). Further, excellent capacitance retention (92.1%) over 5000 cycles confirms their long-term stability, which in turn enlightening the energy storage device progress for future generation electronics.

中文翻译：

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用于高性能非对称超级电容器的高多孔、分层 Co3O4 微球嵌入 N 掺杂碳基质

摘要 氮功能化石墨碳 (NGC) 除了是一种独特的催化剂集成载体材料外，还对各种电化学反应具有内在活性，尤其是在能量存储和转换装置中。鉴于令人钦佩的导电性和分级孔结构，金属氧化物与 NGC 骨架的杂化策略被认为在电极材料的设计中非常引人注目。在这项工作中，羧甲基纤维素和三聚氰胺衍生的 Co3O4 NGC 用作高性能不对称超级电容器 (ASC) 的活性电极材料。合成的 Co3O4 NGC 微球具有介孔网络，在 77 K 时的最大表面积为 445.3 m2 g-1。用活性炭和 Co3O4 NGC 微球作为负极和正极制造固态 ASC，分别基于电荷平衡理论，提供超高电容（128.43 F. g-1）、能量密度（45.66 Wh.kg-1）和功率密度（399.9 W.kg-1）。此外，超过 5000 次循环的出色电容保持率 (92.1%) 证实了它们的长期稳定性，这反过来又启发了下一代电子产品的储能设备进步。