Yuan Yuan, Long Duanfu, Li Zhong, Zhu Jiliang
College of Materials Science and Engineering, Sichuan University Chengdu 610064 China
RSC Adv. 2019 Mar 5;9(13):7210-7217. doi: 10.1039/c8ra10586c. eCollection 2019 Mar 1.
A composite of NiCo Fe O was designed to investigate the effects of Fe substitution on its energy storage performance. Urchin-like products composed of nanowires were successfully synthesized through the hydrothermal method and calcinations. Scanning electron microscopy (SEM) images revealed that Fe substitution could reduce the diameter of the nanowires and hinder the urchin-like sphere construction. X-ray diffraction (XRD), energy dispersive X-ray mapping (EDS-mapping) and X-ray photoelectron spectroscopy (XPS) revealed the successful Fe substitution for Co. More importantly, the specific capacity could be largely improved from 359 C g (826 F g) for = 0 to 523 C g (1188 F g) for = 0.3 at 1 A g. Moreover, with = 0.3, a specific capacity of 788 F g could be maintained as the current density was increased to 20 A g. Asymmetric supercapacitors based on this compound exhibited an energy density of 26.6 W h kg at a power density of 370 W kg.
设计了一种NiCoFeO复合材料，以研究铁替代对其储能性能的影响。通过水热法和煅烧成功合成了由纳米线组成的海胆状产物。扫描电子显微镜（SEM）图像显示，铁替代会减小纳米线的直径并阻碍海胆状球体的构建。X射线衍射（XRD）、能量色散X射线映射（EDS映射）和X射线光电子能谱（XPS）表明铁成功替代了钴。更重要的是，在1 A g的电流密度下，比电容可从x = 0时的359 C g（826 F g）大幅提高到x = 0.3时的523 C g（1188 F g）。此外，当x = 0.3时，随着电流密度增加到20 A g，比电容可保持在788 F g。基于该化合物的非对称超级电容器在功率密度为370 W kg时的能量密度为26.6 W h kg。
