The facile fabrication of functional supercapacitor electrodes with desirable characteristics is a bottleneck challenge to advance the supercapacitor industry. Among those functional materials, metal phosphides and sulfides have been explored separately with various pros and cons. Herein, we report a facile one-step electrodeposition method for the preparation of bimetallic thiophosphide (FNSP) based electrodes that comprise the advantages of both sulfides and phosphides simultaneously. Upon use as a supercapacitor electrode, FNSP shows an exceptionally high specific capacity of 1415.20 C/g at 1 A/g. Moreover, the assembled AC//FNSP asymmetric device reveals outstanding performance with a high energy density of 52.42 Wh/kg corresponding to a power density of 1.70 kW/kg at 2 A/g with superior Coulombic efficiency and cycling stability over 10 000 cycles. The obtained performance metrics demonstrate the superb performance of the fabricated AC// FNSP device over the sulfide or phosphide alone based devices reported so far. The exceptional specific capacitance of the FNSP electrode is attributed to the synergy between S and P in the fabricated electrode that improves the conductivity and provides more electrochemical active sites.
The design and synthesis of innovative materials with
a specific
architecture are necessary to advance the supercapacitor industry.
Recently, transition metal selenides have been identified as an auspicious
type of material for energy storage devices due to their enormous
electronic conductivity and high theoretical capacitance. Consequently,
mono- and diselenides have been extensively investigated. Trimetallic
selenides, however, are infrequently reported, and their charge storage
mechanism is still not fully understood. Herein, earth-abundant trimetallic
Mn–V–Fe selenide (MVF-Se) is successfully fabricated
via a two-step hydrothermal approach. The chemical composition, structure,
and morphology of the as-synthesized material have been thoroughly
characterized. The electrochemical tests revealed that the MVF-Se
electrode possesses a high areal capacitance of 16,212.88 mF cm–2 at 1 mA cm–2 in the three-electrode
configuration. In addition, the assembled asymmetric supercapacitor
device by coupling MVF-Se and activated carbon as the positive and
negative electrodes, respectively, demonstrates a desirable 0.56 mWh
cm–2 energy density at a 1.0 mW cm–2 power density. After 17,000 charge/discharge cycles, the device
exhibits robust cyclic stability with a 95% capacitance retention.
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