Boosted Na+-MnO2 supercapacitor performance via strong metal support interaction.

IF 9.4 1区 化学 Q1 CHEMISTRY, PHYSICAL Journal of Colloid and Interface Science Pub Date : 2025-03-15 Epub Date: 2024-12-05 DOI:10.1016/j.jcis.2024.11.252
Kailun Wang, Junjie Wang, Jun Qian, Qijun Yu, Jia-Qi Bai, Yuxue Wei, Jingshuai Chen, Mingyuan Wu, Song Sun, Chang-Jie Mao
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Abstract

MnO2 is widely utilized as an electrode material in supercapacitors. However, overcoming challenges such as sluggish ion migration, aggregate tendency, and low conductivity is imperative for optimizing MnO2-based supercapacitors. Herein, NaMnO4 was employed as the Mn precursor to introducing a higher concentration of small Na+ ions into the layer structure of δ-MnO2. This elevated Na concentration fosters efficient ion migration within the MnO2 lattice. Moreover, Na+-MnO2 was deposited onto Cu/graphene (Cu/G) composites. Leveraging the strong metal-support interactions (SMSI) between Cu and graphene, the resulting composite demonstrates enhanced conductivity and reduced aggregation. Combining MnO2 with Cu/G resulted in a conductivity of 5.78 × 10-3 S cm-1, which is significantly better than that of MnO2. The composite material exhibits an exceptional electrochemical performance, boasting a specific capacitance of 655 F g-1 at 1 A g-1 and impressive long-term stability, retaining 95 % of its capacitance after 4000 cycles at 10 A g-1. Additionally, a 1.6 V asymmetric supercapacitor was assembled, featuring carbon as the anode, Cu/G/MnO2 as the cathode, and 1 M KOH as the electrolyte, achieving a superior specific capacitance of 75 F g-1 at 1 A g-1. Cu/G/MnO2//carbon demonstrates a maximum energy density of 27 Wh kg-1 at a power density of 0.8 W kg-1. This study underscores a facile strategy to enhance MnO2-based supercapacitors by leveraging the SMSI effect for boosted performance.

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通过强金属支撑相互作用提升Na+-MnO2超级电容器性能。
二氧化锰作为一种电极材料被广泛应用于超级电容器中。然而,克服离子迁移缓慢、聚集倾向和低电导率等挑战是优化二氧化锰超级电容器的必要条件。本文采用NaMnO4作为Mn前驱体,在δ-MnO2的层状结构中引入了高浓度的小Na+离子。这种升高的Na浓度促进了MnO2晶格内有效的离子迁移。此外,还将Na+-MnO2沉积在Cu/石墨烯(Cu/G)复合材料上。利用Cu和石墨烯之间的强金属支撑相互作用(SMSI),所得复合材料具有增强的导电性和减少的聚集性。MnO2与Cu/G复合后的电导率为5.78 × 10-3 S cm-1,明显优于MnO2。复合材料表现出优异的电化学性能,在1 a g-1下具有655 F -1的比电容和令人印象深刻的长期稳定性,在10 a g-1下循环4000次后保持95%的电容。此外,以碳为阳极,Cu/G/MnO2为阴极,1 M KOH为电解液,组装了1.6 V非对称超级电容器,在1 a G -1下获得了75 F G -1的优越比电容。在功率密度为0.8 W kg-1时,Cu/G/MnO2//carbon的最大能量密度为27 Wh kg-1。这项研究强调了通过利用SMSI效应来提高性能来增强二氧化氮超级电容器的简单策略。
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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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