Available on-demand - S.EN12.10.02
Bio-Templated Tubular MCo2O4 (M= Mn, Ni, Cr) Microstructure and Their Electrochemical Performance
Deepa Guragain1,Camila Zequine2,Sanjay Mishra1,Ram Gupta2
University of Memphis1,Pittsburg State University2
Binary oxides with novel nanoarchitectures are increasingly explored for their application in energy storage devices. The nanoarchitecture of these oxides is usually varied via synthesis route, which usually requires complex technologies, expensive equipment, andharmful organic reagents or surfactants, which might further hinder their application. Hence, it is highly desirable to explore facile synthesis strategies, which are cost-effective, simple, and environmentally friendly to get “green” nanomaterials. Recently, bio-templatinghas emerged as a promising technique for the synthesis of Co3O4capacitors [[i]]. Nature offers us various and excellent bio-templates[[ii],[iii],[iv]] such as bamboo, pig bone, crab shells, lotus pollen grains, bacteria [[v]], leaf [[vi]], sorghum straw [[vii]], butterfly wing [[viii]], jute fibers [[ix]], and cotton [ix]. Such bio-templatesexhibit precise widths and lengths, complex exterior and interior surfaces, and uniform geometries, all of which have inspired researchers to produce multiscale hybrid inorganic materials that exhibit hierarchical morphologies.
In this work, we present a comparative study of the electrochemical performance of tubular MCo2O4 (M= Mn, Ni, Cr) microstructures prepared using cotton fiber as a biotemplate. The as-obtained templated MCo2O4(M= Mn, Ni, Cr) structures inherit the morphology and microstructure of cotton fiber. The electrochemical performance of the electrode made up of tubular MCo2O4(M= Mn, Ni, Cr) structure was evaluated in 3M KOH aqueous electrolytes. The large-surface-area of tubular MCo2O4(M= Mn, Ni, Cr) microstructures has a noticeable pseudocapacitive performance with a capacitance of 161 F/g, 190 F/g, and 231 F/g at 1 A/g current density and 378.13F/g , 407.16 F/g , and 403.39 F/g at 2 mV/s scan rate for MnCo2O4, NiCo2O4, and CrCo2O4 respectively. Also a Coulombic efficiency ~100%, and excellent cycling stability with capacitance retention of about 91%, 100%, and 92% for MnCo2O4, NiCo2O4, and CrCo2O4 respectively even after 5,000 cycles. These obtained tubular MCo2O4(M= Mn, Ni, Cr) microstructure display superior electrochemical performance in aqueous 3M KOH electrolyte with peak power density reaching 295.5 W/Kg, 296.3 W/Kg, and 293.5 W/Kg, and energy density 7.8Wh/kg, 9.3 Wh/Kg, and 11.1 Wh/Kg, for MnCo2O4, NiCo2O4, and CrCo2O4 respectively. The superior performance of tubular MCo2O4(M= Mn, Ni, Cr) microstructure electrode is attributed to their high surface area and adequate pore volume distribution, which allows effective redox reaction and diffusion of hydrated ions.
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