Journal
JOURNAL OF POWER SOURCES
Volume 359, Issue -, Pages 585-591Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.05.098
Keywords
Fluorides; Hybrid supercapacitor; Intercalation; Ferroelectric polarization
Funding
- National Natural Science Foundation of China [51172044, 51471085, 11674055]
- Natural Science Foundation of Jiangsu Province of China [BK20151400]
- open research fund of Key Laboratory of MEMS of Ministry of Education, Southeast University
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To pursuit high electrochemical performance of supercapacitors based on Faradaic charge-transfer with redox reaction or absorption/desorption effect, the intercalation efficiency of electrolyte ions into electrode materials is a crucial prerequisite to surpass the pure surface capacity with extra bulk contribution. Here we report layered barium transition metal fluorides, BaMF4 (M = Mn, Co, Ni) to be a series of new electrode materials applied in standard three-electrode configuration. Benefiting from the efficient immersing of electrolyte ions, these materials own prominent specific capacitance. Electrochemical characterizations demonstrate that all the BaMF4 electrodes show both capacitive behavior and Faradaic redox reactions in the cyclic voltammograms, and ability of charge storage by charging-discharging cycling with high cycling stability. Particularly, BaCoF4 shows the highest specific capacitance of 360 F g(-1) at current density of 0.6 A g(-1), even the particle size is far beyond nanometer scale. In addition, first principles calculations reveal the possible underlying mechanisms. (C) 2017 Elsevier B.V. All rights reserved.
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