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Molten salt synthesis of two-dimensional sheet-like nitrogen-cobalt co-doped porous carbon nanosheets for high-performance supercapacitors
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-09-04 , DOI: 10.1016/j.jallcom.2024.176345
Xin Wang , Haibing Wang , Guoqing Feng , Lingling Zhou , Tiewei Zhao , Liwen Zhang , Feng Jiang , Huiyu Li , Yongsheng Liu , Qing Yu , Haijing Cao , Yan Xu , Yanyan Zhu

Porous carbon is highly regarded as one of the ideal materials for supercapacitor fabrication due to its superior chemical stability, cost-effectiveness and excellent conductivity. Nonetheless, it encounters significant challenges, including limited yield, intricate processing and prolonged processing duration, which greatly hinder its widespread production and utilization. In this study, a simple one-step stripping-etching strategy was proposed to prepare N and Co co-doped porous carbon nanosheets (NCo-C-NS) using Co-ZIF-L as the precursor and the KCl/LiCl mixture as the stripping and etching agent. By varying the calcination temperature, the impact of preparation conditions on the electrochemical performance and morphology of the porous carbon was carefully examined. The results demonstrate that NCo-C-NS-800 exhibit large specific surface area (SSA) of 627.4 m² g−1 and achieves the specific capacitance of 201.1 F g−1 at current density of 1 A g−1. Additionally, the assembled NCo-C-NS-800//NiO asymmetric supercapacitor (ASC) demonstrates the specific capacitance of 100.06 F g−1 at 1 A g−1, energy density of 33.2 Wh kg−1 at a high power density of 773.4 W kg−1. The performances of the NCo-C-NS-800//NiO ASC under bending conditions were evaluated, confirming the discharge stability and feasibility for practical applications.

中文翻译:


熔盐合成高性能超级电容器用二维片状氮钴共掺杂多孔碳纳米片



多孔碳因其优异的化学稳定性、成本效益和优异的导电性而被高度认为是超级电容器制造的理想材料之一。然而,其产量有限、加工过程复杂、加工周期长等重大挑战极大地阻碍了其广泛生产和利用。在这项研究中,提出了一种简单的一步剥离-蚀刻策略,以Co-ZIF-L为前驱体,KCl/LiCl混合物为前驱体,制备N和Co共掺杂多孔碳纳米片(NCo-C-NS)。剥离剂和蚀刻剂。通过改变煅烧温度,仔细研究了制备条件对多孔碳电化学性能和形态的影响。结果表明,NCo-C-NS-800 表现出 627.4 m² g−1 的大比表面积 (SSA),并在 1 A g−1 的电流密度下实现了 201.1 F g−1 的比电容。此外,组装的NCo-C-NS-800//NiO非对称超级电容器(ASC)在1 A g−1时表现出100.06 F g−1的比电容,在高功率密度下的能量密度为33.2 Wh kg−1 773.4 W kg−1。对NCo-C-NS-800//NiO ASC在弯曲条件下的性能进行了评估,证实了放电稳定性和实际应用的可行性。
更新日期:2024-09-04
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