当前位置: X-MOL 学术Electrochim. Acta › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
NiFe2O4 nanospheres with size-tunable magnetic and electrochemical properties for superior supercapacitor electrode performance
Electrochimica Acta ( IF 6.6 ) Pub Date : 2021-10-05 , DOI: 10.1016/j.electacta.2021.139346
Thirumurugan Arun 1 , T. Kavinkumar 2 , R. Udayabhaskar 1 , R. Kiruthiga 1 , Mauricio J. Morel 1 , Radhamanohar Aepuru 3 , N. Dineshbabu 4 , K. Ravichandran 5 , Ali Akbari-Fakhrabadi 6 , R.V. Mangalaraja 7
Affiliation  

Hereby, we present our efforts to understand the influence of ferric ions in the preparation of NiFe2O4 magnetic nanoparticles (MNPs) by facile chemical oxidation method. The variation in the Ferric ions content provoked size tunability of the MNPs (particle size reduced with increasing ferric ions content). The effect of ferric ions content on the prepared MNPs were analyzed for phase, morphological and magnetic characteristics by using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Vibrating Sample Magnetometer (VSM) and Thermomagnetic Analysis (TMA) measurements. The saturation magnetization and coercivity values were observed to be 45 emu/g and 90 Oe for the nanoparticles prepared without ferric ions. The size depended reduction in magnetization and coercivity values were evident for increased ferric ion concentration. The curie transition temperature was observed to be 584 °C from TMA analysis. The cyclic voltammogram, galvanostatic charge/discharge and electrochemical impedance measurements were carried out to evaluate the electrochemical characteristics of prepared NiFe2O4 nanoparticles for supercapacitor application. The highest specific capacitance of 277 F/g was observed for the NiFe2O4 nanoparticles that prepared with 50 % of ferric ions (NF50). From the cyclic stability study, 101 % of capacitance retention was demonstrated up to 5000 cycles. An asymmetric two-electrode cell that fabricated with NF50 exhibited a maximum specific capacitance of 56 F/g (with an applied current density of 1 A/g) and higher energy density of 22.5 Wh/ Kg (with a power density of 0.85 kW/Kg). The cyclic stability study of the cell revealed the increased capacity retention (126 % up to 5000 cycles) due to the particle size reduction. The observed enhancements in the magnetic and electrochemical properties with the size reduction are discussed in-detail. The facile strategy presented by this work would give insights for high-performance supercapacitor electrode material.



中文翻译:

NiFe2O4 纳米球具有尺寸可调的磁性和电化学性能,可实现卓越的超级电容器电极性能

在此,我们努力了解铁离子对 NiFe 2 O 4制备的影响磁性纳米粒子 (MNPs) 通过简便的化学氧化方法。三价铁离子含量的变化引起了 MNP 的尺寸可调性(颗粒尺寸随着三价铁离子含量的增加而减小)。通过使用 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、振动样品磁强计 (VSM) 和热磁分析 (TMA),分析了铁离子含量对制备的 MNP 的相、形貌和磁特性的影响测量。对于没有铁离子制备的纳米颗粒,观察到饱和磁化强度和矫顽力值为 45 emu/g 和 90 Oe。对于增加的铁离子浓度,尺寸取决于磁化强度和矫顽力值的降低。从 TMA 分析观察到居里转变温度为 584 °C。用于超级电容器应用的2 O 4纳米颗粒。NiFe 2 O 4的最高比电容为 277 F/g用 50% 的铁离子 (NF50) 制备的纳米颗粒。循环稳定性研究表明,在 5000 次循环后,电容保持率为 101%。使用 NF50 制造的非对称双电极电池的最大比电容为 56 F/g(施加的电流密度为 1 A/g)和更高的能量密度为 22.5 Wh/ Kg(功率密度为 0.85 kW/公斤)。电池的循环稳定性研究表明,由于粒径减小,容量保持率增加(126% 直至 5000 次循环)。详细讨论了随着尺寸减小而观察到的磁性和电化学性能的增强。这项工作提出的简便策略将为高性能超级电容器电极材料提供见解。

更新日期:2021-10-14
down
wechat
bug