High capacity NiCo2O4 nanorods as electrode materials for supercapacitor

• Published in: Journal of alloys and compounds 2014-12, Vol.617, p.988-993
• Main Authors: Zhu, Yirong, Pu, Xuli, Song, Weixin, Wu, Zhibin, Zhou, Zhou, He, Xiao, Lu, Fang, Jing, Mingjun, Tang, Bing, Ji, Xiaobo
• Format: Article
• Language: English
• Subjects: Applied sciences; Electrode material; Electronics; Exact sciences and technology; Materials; Nickel cobaltite nanorods; Room temperature; Solid state reaction; Supercapacitor
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.08.064

•The NiCo2O4 nanorods are prepared by a novel and scalable room-temperature solid state reaction.•The as-obtained NiCo2O4 nanorods give high specific surface area, large pore size and pore volume.•The NiCo2O4 nanorods exhibit high specific capacitance, excellent rate capability and good cycling stability. We demonstrate a novel and scalable route for synthesizing NiCo2O4 nanorods via solid state reactions at room temperature coupled with a simple post annealing treatment. The as-prepared samples are characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and nitrogen adsorption/desorption experiments. The electrochemical performances of NiCo2O4 are characterized by cyclic voltammetry, charge–discharge and electrochemical impedance spectroscopy tests. The results reveal that the NiCo2O4 nanorods manifest a high specific capacitance of 565Fg−1 (1mgcm−2 loading) at a current density of 1Ag−1 with superior rate capability and good cycling stability. The good electrochemical properties combined with the facile and cost-effective preparation method will render it attractive for promising application in supercapacitors.