title: Preparation of Fe3O4 with high specific surface area and improved capacitance as a supercapacitor.
abstract: 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.
authors.affiliation: Jiangsu Laboratory of Advanced Functional Materials, Department of Chemistry, Changshu Institute of Technology, Changshu 215500, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
authors.forename: Hongmei
authors.initials: H
authors.lastname: Ji
authors.forename: Shasha
authors.initials: S
authors.lastname: Wang
authors.forename: Lijuan
authors.initials: L
authors.lastname: Kong
authors.forename: Xuefan
authors.initials: X
authors.lastname: Jiang
authors.forename: Gang
authors.initials: G
authors.lastname: Yang
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry; D025802:Electric Capacitance; D055664:Electrochemical Techniques; D019856:Ethanolamine / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D013499:Surface Properties
chemical_list: D056831:Coordination Complexes; D019856:Ethanolamine; D052203:Ferrosoferric Oxide