Mesoporous spinel manganese zinc ferrite for high-performance supercapacitors

被引：81

作者：

Ismail, Fatma M. ^{[1
]}

Ramadan, Mohamed ^{[2
]}

Abdellah, Ahmed M. ^{[2
]}

Ismail, Ibrahim ^{[1
]}

Allam, Nageh K. ^{[2
]}

机构：

[1] Zewail City Sci & Technol, Renewable Energy Dept, Giza 12588, Egypt

[2] Amer Univ Cairo, Sch Sci & Engn, EML, New Cairo 11835, Egypt

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2018年 / 817卷

关键词：

Spinel; Mesoporous; Supercapacitor; Energy density; Power density; DOUBLE-LAYER CAPACITANCE; COBALT FERRITE; HYDROTHERMAL SYNTHESIS; FACILE SYNTHESIS; NANO-FLAKES; ONE-STEP; ELECTRODES; OXIDE; NANOPARTICLES; PSEUDOCAPACITANCE;

D O I：

10.1016/j.jelechem.2018.04.002

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We report on the synthesis of manganese zinc ferrite (MnZnFe2O4) nanoneedles via a simple one-pot coprecipitation method and their characterization using energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HRTEM) and N-2 adsorption/desorption techniques. The electrochemical performance of MnZnFe2O4 nanoneedles-based supercapacitors was investigated, showing superior specific capacitance of 783 F g(-1), which is significantly higher than that reported for any ferrite material. Also, the spinel MnZnFe2O4 exhibits very high columbic efficiency and an excellent long-term stability. The fabricated asymmetric supercapacitor based on MnZnFe2O4 nanoneedles/activated carbon electrodes can deliver 15.8 Wh kg(-1) energy density at a power density of 899.7 W kg(-1). The contribution of the double layer capacitance was found to be only 3.14% of the total specific capacitance and mainly based on psuedocapacitance faradaic mechanism. Therefore, the fabricated MnZnFe2O4 electrode is a promising candidate for supercapacitor applications.

引用

页码：111 / 117

页数：7

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