Interdependence of the electrical performance of NiCuFeCoMn multi-structure carbonates as electrode material for supercapacitors

超级电容器 材料科学 电极 电容 电解质 介孔材料 阴极 功率密度 化学工程 纳米技术 化学 功率(物理) 生物化学 量子力学 物理 工程类 物理化学 催化作用
作者
Anjneya Verma,Kwang Ho Kim,Sanjay Mathur,Damin Lee
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:922: 166222-166222 被引量:23
标识
DOI:10.1016/j.jallcom.2022.166222
摘要

Mesoporous NiCuFeCoMn multi-structure compounds were grown as cathodes for supercapacitors using a hydrothermal method. A multi-structure electrode was constructed using a variety of nanostructures by varying the reaction time. These diverse nanostructures were highly beneficial in achieving a high electrical performance by increasing the electrode/electrolyte contact area and shortening the ion diffusion path. Optimized multi-structure arrays, which were heated for 12 h, had an excellent maximum specific capacitance of 1241 F g−1 at 3 A g−1, significantly greater than that of the other electrodes. Furthermore, the multi-structure electrode exhibited exceptional cycling stability, with 84.7% retention of the original capacitance after 5000 cycles. Moreover, an asymmetric supercapacitor with the optimized multi-structure compound as the positive electrode and graphene as the negative electrode demonstrated a high energy density of 61 W h kg−1 at a power density of 1017 W k g−1 and exceptional cycling stability by retaining 88.5% of the initial capacity after 5000 cycles. Additionally, the as-obtained asymmetric supercapacitor was capable of powering an LED light. Thus, in terms of electrical performance, the asymmetric supercapacitor fabricated with the NiCuFeCoMn multi-structure compounds outperformed the majority of previously reported transition-metal-based carbonate hydroxide asymmetric supercapacitors.
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