Synergistic effects of Ni doping in MnO2 nanorods: Structural and electrochemical insights for high-performance supercapacitors

Next Energy Pub Date : 2025-06-13 DOI:10.1016/j.nxener.2025.100336

Ritesh Kumar , Diksha , Prachi Jain , Rajesh Kumar Singh , Achchhe Lal Sharma

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Abstract

Supercapacitors are the future of electric vehicles (EVs) because of their high-power density, due to their low energy density, they are not frequently used in EVs, which has pushed researchers towards improving their energy densities. In the present study, the Ni-MnO₂ nanorods have been prepared at different weight percentages of Ni, that is, 2%, 5%, and 7%, using a 1-pot-assisted hydrothermal method. Different techniques were used to characterize the sample, that is, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) to check structural and morphological properties. EDX results confirmed the doping, including different elements (Ni, Mn, O) in the samples. Further, we looked at how well the Ni-MnO₂ electrode worked with 6 M potassium hydroxide (KOH) electrolyte over a wide potential window. The best performance has been observed at 5% weight percentage (NMn-5), exhibiting a specific capacitance of 336 F/g, energy density of 31.7 Wh/kg, and power density of 440 W/kg. Material promises good cyclic stability (capacitance retention 71.8% after 2000 cycles at 1 Ag⁻¹) and coulombic efficiency (90.8%). Further, to check the practicality of the material, we fabricated a device to glow the red LED, and the LED glowed for 5 minutes.

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Ni掺杂二氧化锰纳米棒的协同效应：高性能超级电容器的结构和电化学见解

超级电容器由于其高功率密度是电动汽车的未来，但由于其低能量密度，它们在电动汽车中并不经常使用，这促使研究人员致力于提高其能量密度。在本研究中，采用1锅辅助水热法制备了Ni- mno2纳米棒，Ni的重量百分比分别为2%、5%和7%。采用不同的技术对样品进行表征，即x射线衍射（XRD），场发射扫描电镜（FE-SEM）来检查样品的结构和形态特性。EDX结果证实了掺杂，包括样品中的不同元素（Ni, Mn， O）。此外，我们还研究了Ni-MnO2电极与6 M氢氧化钾（KOH）电解质在宽电位窗口内的工作效果。在5%重量百分比（NMn-5）时，性能最佳，比电容为336 F/g，能量密度为31.7 Wh/kg，功率密度为440 W/kg。材料具有良好的循环稳定性（在1 Ag−1下循环2000次后电容保持率为71.8%）和库仑效率（90.8%）。此外，为了检验材料的实用性，我们制作了一个发光红色LED的装置，LED发光5 分钟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Next Energy

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