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Multilayer carbon materials prepared from Zanthoxylum schinifolium husk for high-performance supercapacitors

机译:由Zanthoxylum schinifolium壳制备的多层碳材料用于高性能超级电容器

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In this work, porous carbon mixed with nitrogen (NC) prepared using Zanthoxylum schinifolium husk as a precursor has been successfully applied in a supercapacitor (SC). The effects of KOH dosage on the structure, composition and capacitive properties of the carbon were investigated by a variety of techniques (SEM, HRTEM, XRD, Raman spectroscopy, XPS, BET, and electrochemical tests). The results of physical characterizations also confirmed that NC had a high specific surface area, abundant pores and a large number of heteroatomic functional groups. Meanwhile, the sample exhibits the best electrochemical performance in a 6 M KOH electrolyte, including high specific capacitance (333.7 F g ~(?1) at a current density of 0.5 A g ~(?1) ), desirable rate capability and superior cycling stability (97.9% capacitance retention after 5000 cycles). More importantly, the assembled symmetrical supercapacitor (NC-3//NC-3) holds superior energy density (16.7 W h kg ~(?1) at a power density of 300.6 W kg ~(?1) ) and good cycling stability (98.5% specific capacitance retention after 5000 cycles).
机译:在这项工作中,使用Zanthoxylum schinifolium壳作为前体的氮气(Nc)混合的多孔碳已成功地应用于超级电容器(SC)。通过多种技术(SEM,HRTEM,XRD,拉曼光谱,XPS,BET和电化学测试,研究了KOH剂量对碳的结构,组成和电容性的影响。物理特征的结果还证实了NC具有高比表面积,丰富的孔隙和大量杂原子官能团。同时,样品在6M KOH电解质中表现出最佳的电化学性能,包括电流密度为0.5Ag〜(α1)),理想的速率能力和优越的循环稳定性(5000个循环后的电容保留97.9%)。更重要的是,组装的对称超级电容器(NC-3 // NC-3)保持出优异的能量密度(16.7WH kg〜(α1),功率密度为300.6W kg〜(α1))和良好的循环稳定性( 5000个循环后的98.5%特定电容保留)。

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