The
use of easy synthesis methodology, high performance, and stable
electrode materials is mandatory while developing potential energy
storage devices on a mass scale. In the present work, room-temperature
operating, a simple solution method is employed for obtaining ultrathin
bismuth oxide chloride (BiOCl) supercapacitor electrode material over
3D nickel-foam. This free-standing BiOCl ultrathin petal-type electrode
material was characterized for confiming the crystal strcture, surface
morphology, and surface area by various characterization tools and
then is envisaged in electrochemical supercapacitor application. Electrochemical
analysis performed by several means has revealed an optimum specific
capacitance of 379 F·g–1 (at current density
of 1.25 A g–1). The symmetric electrochemical supercapacitor
device assembled using two identical BiOCl electrodes in the presence
of 6 M KOH electrolyte has demonstrated an excellent energy density
of 12 Wh kg–1 and 1125 W kg–1 power
density, and about 80% retention over 5000 cycles. Red, yellow, and
green LEDs were ignited for ∼10 min glowing time using three
BiOCl//BiOCl symmetric devices connecting in series, and it thus has
a potential for accelerating energy storage devices like electrical
vehicles and mobile phones.
Three-dimensional nanomaterials of desired structural/morphological properties and highly porous with a high specific surface area are important in a variety of applications. In this work, glycerol-mediated self-growth of 3-D dandelion flower-like nickel chloride (NiCl2) from nickel-foam (NiF) is obtained for the first time using a room-temperature (27 °C) processed wet chemical method for electrocatalysis application. Glycerol-mediated self-grown NiCl2 flowers demonstrate an excellent electrocatalytic performance towards the hydrogen evolution reaction (HER), which is much superior to the NiF (303 mV) and NiCl2 electrode prepared without glycerol (208 mV) in the same electrolyte solution. With a Tafel slope of 41 mV dec−1, the NiCl2 flower electrode confirms improved reaction kinetics as compared to the other two electrodes, i.e., NiF (106 mVdec−1) and NiCl2 obtained without glycerol (56 mV dec−1). The stability of the glycerol-based NiCl2 electrode has further been carried out for 2000 cycles with the overpotential diminution of just 8 mV, approving an electrocatalyst potential of glycerol-based NiCl2 electrode towards HER kinetics. This simple and easy growth process involves nucleation, aggregation, and crystal growth steps for producing NiCl2 nanostructures for electrocatalytic water splitting application through the HER process.
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