Jiangsu Laboratory of Advanced Functional Materials, Department of Chemistry, Changshu Institute of Technology, Changshu 215500, China.
Nanoscale. 2013 May 7;5(9):3793-9. doi: 10.1039/c3nr00256j. Epub 2013 Mar 19.
Here, we report for the first time a facile ultrasonic synthesis of Fe3O4 nanoparticles using FeCl3 and the organic solvent ethanolamine (ETA). The intermediate of the ETA-Fe(II) complex produces Fe3O4 after hydrolysis and hydrothermal treatment. The moderate reduction of ETA and ultrasound play an important role in the synthesis of superfine Fe3O4 particles with a very high specific surface area (165.05 m(2) g(-1)). The Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), high-resolution transmission electron microscopy (HRTEM), and ultraviolet-visible absorption spectroscopy (UV-vis). Fe3O4 as an electrode material was fabricated into a supercapacitor and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements. The as-synthesized Fe3O4 exhibits remarkable pseudocapacitive activities including high specific capacitance (207.7 F g(-1) at 0.4 A g(-1)), good rate capability (90.4 F g(-1) at 10 A g(-1)), and excellent cycling stability (retention 100% after 2000 cycles). This novel synthetic route towards Fe3O4 is a convenient and potential way of producing a secondary energy material which is expected to be applicable in the synthesis of other metal oxide nanoparticles.
在这里，我们首次报道了一种简便的超声合成方法，使用 FeCl3 和有机溶剂乙醇胺（ETA）合成 Fe3O4 纳米粒子。ETA-Fe(II) 配合物的中间产物在水解和水热处理后生成 Fe3O4。ETA 的适度还原和超声在合成具有极高比表面积（165.05 m2/g）的超细微 Fe3O4 颗粒中起着重要作用。通过 X 射线衍射（XRD）、扫描和透射电子显微镜（SEM 和 TEM）、高分辨率透射电子显微镜（HRTEM）和紫外-可见吸收光谱（UV-vis）对 Fe3O4 纳米粒子进行了表征。将 Fe3O4 纳米粒子作为电极材料制备成超级电容器，并通过循环伏安法（CV）、电化学阻抗谱（EIS）和恒电流充放电测量进行了表征。所合成的 Fe3O4 表现出显著的赝电容活性，包括高比电容（在 0.4 A/g 时为 207.7 F/g）、良好的倍率性能（在 10 A/g 时为 90.4 F/g）和优异的循环稳定性（在 2000 次循环后保持 100%）。这种合成 Fe3O4 的新方法是一种方便且有潜力的制备二次能源材料的方法，有望应用于其他金属氧化物纳米粒子的合成。
