Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe2O4

doi:10.15541/jim20200015

Abstract

Abstract:

In order to improve the electrochemical performance, the phosphate ion doped MnFe₂O₄ (PMFO) was synthesized by a hydrothermal method combined with a subsequent phosphatization treatment. Both the specific surface area and electrical conductivity of electrode material are improved by the phosphate ion functionalization. Furthermore, the specific capacitance is 750 F/g at 1 A/g for PMFO, which is almost 1.7% higher than that of MFO. Besides, the cyclic stability of PMFO electrode is also improved. The asymmetric supercapacitors (ASCs) assembled by positive electrode PMFO and actived negative electrode carbon (AC) display an ultrahigh energy density of 168.8 Wh/kg at a power density of 2.7 kW/kg. The PMFO is demonstrated as a promising electrode material for supercapacitor applications.

Key words: MnFe₂O₄, phosphate ion, doping, supercapacitor

CLC Number:

TB34

FEI Mingjie, ZHANG Renping, ZHU Guisheng, YU Zhaozhe, YAN Dongliang. Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe₂O₄[J]. Journal of Inorganic Materials, 2020, 35(10): 1137-1141.

Figures/Tables 4

Fig. 1 XRD patterns of MFO and PMFO (a), and SEM images of MFO (b) and PMFO (c)

Fig. 2 Survey (a), P2p(b) and O1s (c) of XPS spectra for MFO and PMFO

Fig. 3 CV (a), CP (b), EIS (c), cycle life, (d) specific capacitance and coulombic efficiency (e) curves for MFO and PMFO

Fig. 4 CV curves of PMFO and AC (a); CV at different scan rates (b), CP at different densities (c), cyclic life (d) for PMFO//AC ASC, and Ragone plots and other previously reported ASCs (e)

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Preparation and Pseudocapacitive Properties of Phosphate Ion-doped MnFe₂O₄

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