Mahmoud A. Hefnawy, Rewaida Abdel-Gaber, Sobhi M. Gomha, Magdi E. A. Zaki, Shymaa S. Medany
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引用次数: 0
摘要
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
Synthesis of Nickel-Manganese Spinel Oxide Supported on Carbon-Felt Surface to Enhance Electrochemical Capacitor Performance
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.
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