揭示 Mn3+/ Mn4+ 和 Ni2+ 作为下一代储能设备高容量材料的潜力

IF 5.2 2区 化学 Q1 CHEMISTRY, APPLIED
Jhonatam Pinheiro Mendonça , Scarllett Lalesca Lima , Pedro Nothaft Romano , João Monnerat Araújo Ribeiro de Almeida , Sydney Ferreira Santos , Liying Liu , Roberto Batista de Lima , Marco Aurélio Suller Garcia
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引用次数: 0

摘要

在本研究中,我们通过水热法合成了氧化锰纳米线,并探讨了掺杂镍(Ni)对其形态和电化学特性的影响。我们利用 TEM 和 XPS 分析研究了掺入镍后引起的结构和化学变化。结果表明,掺杂镍影响了锰氧化态的分布,掺杂 1.6 wt% 镍的纳米线呈现出最佳状态。此外,我们还观察到 Mn3+/Mn4+ 比率随掺镍量的增加而平衡。电化学特性分析表明,镍掺杂水平为 1.6 wt% 时,镍锰氧纳米线的容量增强。电静态充放电测量证实了这一镍掺杂水平的优越性能;此外,利用这些纳米线制造的不对称超级电容器电池显示出更强的储能能力。主要结果显示了极高的容量(1 A g-1 和 20 A g-1 时分别为 955.55 mAh g-1 和 383.33 mAh g-1)和出色的速率能力。超过 8500 次的循环稳定性测试表明,该纳米线具有出色的容量保持能力,其初始容量保持率高达 85%,这凸显了经过优化的镍氧化锰纳米线的耐用性。因此,这项研究强调了在氧化锰纳米线中掺杂镍在控制合成过程时对提高电化学性能的重要意义,为高性能储能器件的开发提供了宝贵的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unveiling the Mn3+/ Mn4+ and Ni2+ potential as a high-capacity material for next-generation energy storage devices

In this study, we synthesized MnOx nanowires via hydrothermal methods and explored the impact of nickel (Ni) doping on their morphology and electrochemical properties. We investigated the structural and chemical changes induced by Ni incorporation by utilizing TEM and XPS analyses. Our results revealed that Ni doping influenced the distribution of manganese oxidation states, with 1.6 wt% Ni-doped nanowires exhibiting the optimized condition. Also, we observed a balance between the Mn3+/Mn4+ ratio with the Ni doping. Electrochemical characterization demonstrated enhanced capacity in Ni-MnOx nanowires at the 1.6 wt% Ni doping level. Galvanostatic charge-discharge measurements confirmed the superior performance of this level of Ni doping; moreover, the fabrication of asymmetric supercapacitor cells using these nanowires showed improved energy storage capabilities. The main results showed exceptionally high capacity (955.55 and 383.33 mAh g−1 at 1 and 20 A g−1, respectively) and an excellent rate capability. Cycling stability tests over 8500 cycles demonstrated excellent retention of capacity, underscoring the durability of the optimized Ni-MnOx nanowires, with a retention of 85 % of its initial capacity. Thus, this study emphasizes the significance of Ni doping in MnOx nanowires for enhancing electrochemical performance when the synthetic process is controlled, offering valuable insights for high-performance energy storage device development.

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来源期刊
Catalysis Today
Catalysis Today 化学-工程:化工
CiteScore
11.50
自引率
3.80%
发文量
573
审稿时长
2.9 months
期刊介绍: Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.
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