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Defective mesoporous carbon/MnO2 nanocomposite as an advanced electrode material for supercapacitor application
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.jallcom.2021.160874
Nourali Mohammadi , Keivan Pourreza , Narmin Bahrami Adeh , Mehran Omidvar

Herein, the supercapacitive characteristics of a novel nanocomposite based on defective mesoporous carbon (DMC) and MnO2 is presented. DMC was obtained via a facile and low-cost synthesis route and its interconnected pore network was served as host matrix for the growth of MnO2 nanoparticles to form the DMC/MnO2 nanocomposite. The deposition of MnO2 nanoparticles at the surface of DMC support was investigated using different structural analyses including FT-IR, Nitrogen adsorption/desorption, XRD, XPS, SEM and TEM. Compared to DMC and MnO2 electrodes, the DMC/MnO2 nanocomposite exhibited the highest specific capacitance reaching to 292 F g−1 at current density of 0.5 A g−1. Also, DMC/MnO2 possessed good rate performance (61% capacity retention over 0.5–10 A g−1) and cycling stability (21% capacity loss after 2000 charge/discharges cycles). Furthermore, a two-electrode symmetric supercapacitor device delivered a high specific energy of 34 W h kg−1 at specific power of 100 W kg−1.



中文翻译:

有缺陷的介孔碳/MnO 2纳米复合材料作为用于超级电容器应用的先进电极材料

在此,介绍了基于缺陷介孔碳 (DMC) 和 MnO 2的新型纳米复合材料的超级电容特性。DMC 是通过一种简便且低成本的合成途径获得的,其互连的孔网络用作 MnO 2纳米颗粒生长的基质,以形成 DMC/MnO 2纳米复合材料。使用不同的结构分析,包括 FT-IR、氮吸附/解吸、XRD、XPS、SEM 和 TEM,研究了 MnO 2纳米颗粒在 DMC 载体表面的沉积。与DMC和MnO 2电极相比,DMC/MnO 2纳米复合材料表现出最高的比电容,达到292 F g -1在0.5 A g -1 的电流密度下。此外,DMC/MnO 2具有良好的倍率性能(0.5-10 A g -1 的容量保持率为61% )和循环稳定性(2000 次充电/放电循环后容量损失为21%)。此外,双电极对称超级电容器装置在100 W kg -1 的比功率下提供了34 W h kg -1的高比能量。

更新日期:2021-06-23
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