One-step preparation of sheet-like α-Ni(OH)2 composite multi-walled carbon nanotubes for high-performance asymmetric supercapacitors

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2024-10-29 DOI:10.1007/s10853-024-10349-5

Lihua Zhang, Xiaoyang Cheng, Lingyan Li, Hao Wu, Jinfeng Zheng, Zhipeng Zhao, Lei Tan

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Abstract

The composite α-Ni(OH)₂@CNT of multi-walled carbon nanotubes (CNT) and sheet-like α-Ni(OH)₂ was prepared by a one-step hydrothermal method. The structures and electrochemical properties of α-Ni(OH)₂@CNT and α-Ni(OH)₂ have been studied in detail. Since hydroxylated CNT was used in this study, CNT provides the dual role of dispersion and conductivity for α-Ni(OH)₂@CNT. The structural characterization shows that the thickness of α-Ni(OH)₂@CNT nanosheets is significantly lower than that of α-Ni(OH)₂, and the specific surface area and pore volume are significantly higher than that of α-Ni(OH)₂, which provides more active sites for the composites. The electrochemical test results show that the specific capacitance and rate performance of α-Ni(OH)₂@CNT are much higher than that of α-Ni(OH)₂. The asymmetric supercapacitor (ASC) assembled with α-Ni(OH)₂@CNT and activated carbon (AC) can provide an energy density of 42.8 Wh kg⁻¹ at a power density of 800 W kg⁻¹, and the specific capacity can be maintained by 80% after 20,000 cycles, showing good application value. The theoretical calculation results further confirm that CNT increases the conductivity of α-Ni(OH)₂@CNT. This work provides a low cost and effective modification method for the practical application of α-Ni(OH)₂.

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一步制备用于高性能不对称超级电容器的片状α-Ni(OH)2 复合多壁碳纳米管

通过一步水热法制备了由多壁碳纳米管（CNT）和片状α-Ni(OH)2组成的复合材料α-Ni(OH)2@CNT。详细研究了 α-Ni(OH)2@CNT和α-Ni(OH)2的结构和电化学特性。由于本研究中使用的是羟基化 CNT，因此 CNT 为 α-Ni(OH)2@CNT 提供了分散和导电的双重作用。结构表征结果表明，α-Ni(OH)2@CNT 纳米片的厚度明显低于α-Ni(OH)2，比表面积和孔体积明显高于α-Ni(OH)2，这为复合材料提供了更多的活性位点。电化学测试结果表明，α-Ni(OH)2@CNT 的比电容和速率性能远高于 α-Ni(OH)2。用α-Ni(OH)2@CNT和活性炭（AC）组装的不对称超级电容器（ASC）在功率密度为800 W kg-1的条件下，能量密度可达42.8 Wh kg-1，且比容量在20000次循环后仍能保持80%，具有良好的应用价值。理论计算结果进一步证实，CNT 提高了 α-Ni(OH)2@CNT 的导电性。这项工作为 α-Ni(OH)2的实际应用提供了一种低成本、有效的改性方法。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.