BaMF${}_4$ (M = Mn, Co, Ni): New Electrode Materials for Hybrid Supercapacitor with Layered Polar Structure

Abstract

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 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.

arXiv comment22 pages, 12 figures

References in corpus (6)

• Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
• Origin of ferroelectricity in the multiferroic barium fluorides BaMF4
• BaNiF4: an electric field-switchable weak antiferromagnet
• Magnetoelectricity coupled exchange bias in BaMnF${}_4$
• Strong room-temperature blue-violet photoluminescence of multiferroic BaMnF${}_4$
• Synthesis, Optical, and Magnetic Properties of Ba${}_2$Ni${}_3$F${}_{10}$ Nanowires