Construction of MnO2@NH4MnF3 core-shell nanorods for asymmetric supercapacitor

被引：43
作者：
Li, Bin [1 ]
Zhang, Xihua [1 ]
Dou, Jinhe [1 ]
Zhang, Pengxiang [1 ]
机构：
[1] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2020年 / 347卷
关键词：
Nanorods; Composite; Valence state; MnO2; NH4MnF3; ELECTROCHEMICAL ENERGY-STORAGE; HIERARCHICALLY POROUS CARBON; HIGH-PERFORMANCE; ELECTRODE MATERIALS; FACILE SYNTHESIS; SOLVOTHERMAL SYNTHESIS; MNO2; NANOSHEETS; COMPOSITES; GRAPHENE;
D O I：
10.1016/j.electacta.2020.136257
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this research, a facile method to produce the core-shell MnO2@NH4MnF3 nanorods of 50-80 nm in diameter from the manganese silicate particles was introduced. The alpha-MnO2 and NH4MnF3 samples were synthesized and their electrochemical performances were also measured for comparison. TEM and EDS results show the similar to 6 nm NH4MnF3 shell is well coated on the alpha-MnO2 core. This novel nanocomposite has less Mn(II) and more Mn(IV) content, better conductivity, as well as moderate capacitive contribution. Besides, the specific capacitance of MnO2@NH4MnF3 nanorods reaches 240 F g(-1) and could retain 98.0% of initial after 1000 cycles galvanostatic charge/discharge. The asymmetric supercapacitor AC//MnO2@NH4MnF3 with 1.7 V working potential range has been fabricated. It performs an energy density of 11.2 Wh kg(-1) at the power density of 10 kW kg(-1). (C) 2020 Elsevier Ltd. All rights reserved.
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页数：9
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