Synthesis of Nickel-Manganese Spinel Oxide Supported on Carbon-Felt Surface to Enhance Electrochemical Capacitor Performance

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-02-13 DOI:10.1007/s12678-025-00932-y

Mahmoud A. Hefnawy, Rewaida Abdel-Gaber, Sobhi M. Gomha, Magdi E. A. Zaki, Shymaa S. Medany

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Abstract

Energy storage has become an essential need for today’s applications. Thus, the development of capacitors and their materials has gotten great attention. In this study, a high mass loading (2 mg cm⁻²) NiMn₂O₄/carbon felt (CF-NMO) was fabricated using a hydrothermal process and used as a new material for a pseudo-capacitive electrode having a potential window of 0.65 V. Several analytical techniques were employed to confirm the structure, such as X-ray diffraction (XRD), and X-ray photon spectroscopy (XPS). The spinel oxide distribution and surface morphology were studied using scanning electron microscopy (SEM), and transmitted electron microscopy (TEM). The activity of the modified CF-NMO was investigated in 1.0 M NaOH. The prepared electrode reached a capacitance of 301 F g⁻¹ at the current density of 1 mA g⁻¹. Furthermore, the electrode’s durability was investigated for 2000 cycles at 5 mA g⁻¹, and the provided capacitance retention was ~ 85% compared to the 1st cycle. Also, the rate capability was estimated to be 69% in the current range from 1 to 5 mA cm⁻².

Graphical Abstract

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碳毡表面负载氧化镍锰尖晶石提高电化学电容器性能的合成

能量存储已经成为当今应用的基本需求。因此，电容器及其材料的发展备受关注。本研究采用水热法制备了高质量负载（2 mg cm−2）的NiMn2O4/碳毡（CF-NMO），并将其作为具有0.65 V电位窗口的伪电容电极的新材料。采用x射线衍射（XRD）和x射线光子光谱（XPS）等分析技术对其结构进行了确证。利用扫描电镜（SEM）和透射电镜（TEM）研究了尖晶石氧化物的分布和表面形貌。研究了改性后的CF-NMO在1.0 M NaOH中的活性。制备的电极在电流密度为1ma g−1时，电容达到301 F g−1。此外，研究了该电极在5ma g−1下循环2000次的耐久性，与第一次循环相比，提供的电容保持率为~ 85%。此外，在电流范围为1至5 mA cm - 2的情况下，速率容量估计为69%。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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