Almotairy Awatif Rashed Z, Al-Maswari Basheer M, Alkanad Khaled, Lokanath N K, Radhika R T, Venkatesha B M
Department of Chemistry, Faculty of Science, Taibah University, Yanbu 30799, Saudi Arabia.
Department of Chemistry, Faculty of Applied Sciences and Humanities, Amran University, Yemen.
Heliyon. 2023 Jul 20;9(8):e18496. doi: 10.1016/j.heliyon.2023.e18496. eCollection 2023 Aug.
A nickel-vanadium-based bimetallic precursor was produced using the polymerization process by urea-formaldehyde copolymers. The precursor was then calcined at 800 °C in an argon ambiance to form a NiVO-NC magnetic nanocomposite. Powerful techniques were used to study the physical characteristics and chemical composition of the fabricated NiVO-NC electrode. PXRD, Raman, and FTIR analyses proved that the crystal structure of NiVO-NC included N-doped graphitic carbon. FESEM and TEM analyses imaging showed the distribution of the NiVO nanoparticles on the layered graphitic carbon structure. TEM images showed the prepared sample has a particle size of around 10-15 nm with an enhanced active site area of 146 m/g, as demonstrated by BET analysis. NiVO-NC nanocomposite exhibits magnetic behaviors and a magnetization saturation value of 35.99 emu/g. The electrochemical (EC) studies of the synthesized NiVO-NC electrode proceeded in an EC workstation of three-electrode. In a 5 M potassium hydroxide as an electrolyte, the cyclic voltmeter exhibited an enhanced capacitance () of 915 F/g at 50 mV/s. Galvanic charge-discharge (GCD) study also exhibited a superior capacitive improvement of 1045 F/g at a current density () of 10 A/g. Moreover, the fabricated NiVO-NC nanocomposite displays a good power density () of 356.67 W/kg, improved ion accessibility, and substantial charge storage. At the high energy density () of 67.34 W h/kg, the obtained was 285.17 W/kg. The enhanced GCD rate, cycle stability, and of the NiVO-NC magnetic nanocomposite nominate the sample as an excellent supercapacitor electrode. This study paves the way for developing effective, efficient, affordable, and ecologically friendly electrode materials.
采用尿素 - 甲醛共聚物的聚合工艺制备了一种镍钒基双金属前驱体。然后将该前驱体在氩气氛围中于800℃煅烧，以形成NiVO - NC磁性纳米复合材料。运用强大的技术手段研究了所制备的NiVO - NC电极的物理特性和化学成分。PXRD、拉曼和FTIR分析证明，NiVO - NC的晶体结构包含N掺杂的石墨碳。FESEM和TEM分析成像显示了NiVO纳米颗粒在层状石墨碳结构上的分布。TEM图像显示，所制备的样品粒径约为10 - 15nm，BET分析表明其活性位点面积增加至146m²/g。NiVO - NC纳米复合材料表现出磁性行为，饱和磁化强度值为35.99emu/g。合成的NiVO - NC电极的电化学（EC）研究在三电极EC工作站中进行。在5M氢氧化钾作为电解质的情况下，循环伏安法在50mV/s时显示出增强的电容（）为915F/g。恒流充放电（GCD）研究还表明，在电流密度（）为10A/g时，电容性有优异的提升，达到1045F/g。此外，所制备的NiVO - NC纳米复合材料显示出良好的功率密度（）为356.67W/kg，离子可及性得到改善，且电荷存储量大。在67.34W h/kg的高能量密度（）下, 所获得的（）为285.17W/kg。NiVO - NC磁性纳米复合材料增强的GCD速率、循环稳定性和（）使其成为优异的超级电容器电极。本研究为开发有效、高效、经济且生态友好的电极材料铺平了道路。
