Enhancing pseudocapacitive behavior of CoFe-LDH through MWCNTs conductive network: a strategy for ultra-stable supercapacitors

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-06-02 DOI:10.1016/j.diamond.2025.112499

Qihui Niu , Suna Zhang , Lijun Wang , Yongmin Qiao , Jianguang Xu , Jing Li , Wenqin Li , Yong Zhu , Yang Li , Huaqing Xie

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Abstract

Layered double hydroxide (LDH) holds a prospective position in the realm of electrode materials for supercapacitors, due to its distinctive layered structure. However, its inherent low conductivity hinders its possible utilization in supercapacitors. In this study, we synthesized CoFe-LDH nanosheets and introduced multi-walled carbon nanotubes (MWCNTs) to construct MWCNTs wrapped CoFe-LDH nanocomposites. The results show that the CoFe-LDH/MWCNTs nanocomposite has a specific capacitance of 752.5 F/g under a current density of 1 A/g. The potential electrochemical capability of the CoFe-LDH/MWCNTs nanocomposite is excited via the construction of the conductive network of MWCNTs. High energy density (71 Wh/kg) and power density (9800 W/kg) are generated in an asymmetric supercapacitor with CoFe-LDH/MWCNTs nanocomposite as electrochemical active material, showing excellent cycle stability of 88.9 % capacitance remaining even after 10,000 cycles. These results indicate that MWCNTs wrapped CoFe-LDH composites are promising candidates for high performance supercapacitors.

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通过MWCNTs导电网络增强钴- ldh的赝电容行为：一种超稳定超级电容器的策略

层状双氢氧化物（LDH）由于其独特的层状结构，在超级电容器电极材料领域具有广阔的应用前景。然而，其固有的低导电性阻碍了其在超级电容器中的应用。在本研究中，我们合成了fe - ldh纳米片，并引入多壁碳纳米管（MWCNTs）构建MWCNTs包裹的fe - ldh纳米复合材料。结果表明，在电流密度为1 a /g时，CoFe-LDH/MWCNTs纳米复合材料的比电容为752.5 F/g。通过MWCNTs导电网络的构建，激发了fe - ldh /MWCNTs纳米复合材料潜在的电化学性能。以fe - ldh /MWCNTs纳米复合材料为电化学活性材料的非对称超级电容器产生了高能量密度（71 Wh/kg）和功率密度（9800 W/kg），在10,000次循环后仍保持88.9%的良好循环稳定性。这些结果表明，MWCNTs包裹的钴- ldh复合材料是高性能超级电容器的理想候选材料。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.