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Interconnected two-dimensional MnO2 nanosheets anchored on three-dimensional porous Cu skeleton as a high-performance cathode for energy storage
Applied Surface Science ( IF 6.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.apsusc.2020.147152
Tianzhen Jian , Jinyun Zhu , Wenqing Ma , Xiuling Yan , Guangda Li , Jianhua Zhou

Abstract Interconnected two-dimensional (2D) MnO2 nanosheet network anchored on 3D nanoporous Cu skeleton (named as NPC@MnO2) was easily prepared by utilizing the redox reaction between KMnO4 and Cu. The as-prepared trans-dimensional NPC@MnO2 composite, which combined the advantages of high surface area MnO2 nanosheets and 3D integrated conductive NPC skeleton, is equipped with abundant multilevel pore voids, rich active sites and channels for smooth ion and electron delivery. The NPC@MnO2 exhibits decent specific capacitance, admirable cycling and rate capability. At a high current density of 10 A g−1, the NPC@MnO2 can be durably cycled for more than 10,000 loops with 91.6% capacitance retention. An asymmetric supercapacitor was constructed with NPC@MnO2 and active carbon, and delivered a high energy density of 10.9 Wh kg−1 (at a power density of 4260 W kg−1) and a high capacitance retention of 93.4% over 10,000 cycles at 10 A g−1. With the merits of easy preparation and superior energy storage performances, NPC@MnO2 holds promising application prospect as a candidate for high performance supercapacitors.

中文翻译:

互连的二维 MnO2 纳米片锚定在三维多孔 Cu 骨架上作为高性能的储能阴极

摘要 利用 KMnO4 和 Cu 之间的氧化还原反应,可以很容易地制备锚定在 3D 纳米多孔 Cu 骨架上的互连二维 (2D) MnO2 纳米片网络(命名为 NPC@MnO2)。所制备的跨维 NPC@MnO2 复合材料结合了高表面积 MnO2 纳米片和 3D 集成导电 NPC 骨架的优点,具有丰富的多级孔隙、丰富的活性位点和用于平滑离子和电子传输的通道。NPC@MnO2 表现出不错的比电容、令人钦佩的循环和倍率能力。在 10 A g-1 的高电流密度下,NPC@MnO2 可以持续循环超过 10,000 次循环,电容保持率为 91.6%。用 NPC@MnO2 和活性炭构建了一个不对称超级电容器,并提供了 10 的高能量密度。9 Wh kg-1(功率密度为 4260 W kg-1)和在 10 A g-1 的 10,000 次循环中具有 93.4% 的高电容保持率。NPC@MnO2 具有制备容易和储能性能优异的优点,作为高性能超级电容器的候选者具有广阔的应用前景。
更新日期:2020-11-01
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