Flower-like and porous Ni3S2 nanosheets for high performance supercapacitors

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-05 DOI:10.1016/j.jelechem.2024.118695

Wenkang Miao , Yuan Li , Hao Yin , Lang Cao , Jincheng Liu

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Abstract

Transition metal sulfides have received significant attention as electrode materials for their low cost and high specific capacitance. Herein, flower-like and porous Ni₃S₂-120-10 assembled by nanosheets is directly grown on nickel foams through a facile one-step hydrothermal method. Benefited from the porous structure, the flower-like compound offers respectable gravimetric specific capacitance of 1899.4F g⁻¹ at a current density of 1 A/g in 6 M KOH aqueous electrolyte. Moreover, an asymmetric supercapacitor (ASC) was obtained using Ni₃S₂-120-10 as the positive electrode and active carbon as the negative electrode with 6 M KOH as the electrolyte. Ni₃S₂-120-10//AC displays a high power density of 1590.7 W kg⁻¹ at the energy density of 17.6 Wh kg⁻¹ accompanied with an outstanding cyclic stability (83.2 % of initial capacitance after 8000 cycles). This work provides a facile strategy for the next generation energy-storage applications with high stability and superior electrochemical capacity.

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用于高性能超级电容器的花朵状多孔 Ni3S2 纳米片

过渡金属硫化物因其低成本和高比电容作为电极材料而备受关注。本文通过简单的一步水热法，在镍泡沫上直接生长出了由纳米片组装而成的花状多孔 Ni3S2-120-10。得益于多孔结构，这种花状化合物在 6 M KOH 水电解液中的电流密度为 1 A/g 时可提供 1899.4F g-1 的可观重量比电容。此外，以 Ni3S2-120-10 为正极，活性炭为负极，6 M KOH 为电解质，还获得了一种不对称超级电容器（ASC）。在能量密度为 17.6 Wh kg-1 的情况下，Ni3S2-120-10//AC 显示出 1590.7 W kg-1 的高功率密度和出色的循环稳定性（8000 次循环后初始电容的 83.2%）。这项工作为具有高稳定性和卓越电化学容量的下一代储能应用提供了一种简便的策略。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.