Template and sol‐gel routed CoMn ₂ O ₄ nanofibers for supercapacitor applications

Abstract

Summary Nanofibrous CoMn2O4 materials are prepared by a simple and most adoptable sol‐gel process. To create the nanofabric morphology, small pieces of tissue paper are utilized as a template form. The prepared CoMn2O4 material was characterized by X‐ray diffraction, field‐emission scanning electron microscopy, Fourier‐transform infrared spectroscopy, Brunauer‐Emmett‐Teller, X‐ray photoelectron spectroscopy, and transmission electron microscopy techniques. Supercapacitive performance of the CoMn2O4 nanofibers was observed in an aqueous potassium hydroxide electrolyte, and a specific capacity of 134 mAh g−1 at 1 A g−1 was obtained. On the basis of the high energy storage performance of this material, an aqueous asymmetric supercapacitor (ASC) was assembled. The high power and energy density values of 0.725 kW kg−1 and 30 W h kg−1, respectively at 1 A g−1 were achieved. The ASCs can light up eleven light‐emitting diodes. Furthermore, a kitchen timer and a toy motor were also powered by the fabricated ASCs.

Sonochemical synthesized BaMoO4/ZnO nanocomposites as electrode materials: A comparative study on GO and GQD employed in hydrogen storage

“… Material Electrolyte Capacity (mAhg −1 ) Ref. 1 ZnMn 2 O 4 KOH (2 M) 160 [94] 2 Ce 2 W 2 O 9 /CoWO 4 KOH (2 M) 115 [17] 3 NiMnO 3 -RGO NiMnO 3 KOH (3 M) 91 47.7 [95] 4 CoMn 2 O 4 KOH (1 M) 134 [96] 5 LaCrO 3 KOH (7 M) 107 [97] 6 LaFeO 3 KOH (7 M) 80 [98] 7 Li 2 Ni(WO 4 ) 2 Li 2 Co(WO 4 ) 2 Li 2 Cu(WO 4 ) 2 H 2 SO 4 (0.5 M) 121 98 84 [99] 8 BaMoO 4 /ZnO BaMoO 4 /ZnO-GO BaMoO 4 /ZnO-GQD KOH (2 M) 129 213 284 This work …”

Nanoarchitectured transition metal oxides and their composites for supercapacitors

“…This was followed by mixing two solutions and dropwise addition of Triethanolamine (chelating agent) and overnight stirring at 150 via sol-gel route and obtained a nanofabric morphology by using tissue paper pieces as a template. [81]…”

“…have prepared CoMn 2 O 4 nanofibers via sol‐gel route and obtained a nanofabric morphology by using tissue paper pieces as a template. [ 81 ]…”

“…The assembled ASC displayed a capacitance of 126.9 F/g at 1 A/g current density with an energy density of 56.7 Wh/kg at 756 W/kg power density. Other than these, spinel cobaltite MCo 2 O 4 (M = Ni, Co, and Mn), [ 200 ] NiCoFeO 4 nanorods, [ 201 ] and CoMn 2 O 4 nanofibres [ 81 ] have been synthesized and found to demonstrate good electrochemical performance suitable for next‐generation supercapacitors.…”

Unraveling the Critical Role of Octahedrally Coordinated Mn in Spinel Manganites toward Enhanced Electrochemical Charge Storage

“…Among them, pseudocapacitors were recognized as attractive candidates due to their high power and energy densities, good cyclic stability, and environmental friendliness. − The electroactive materials, which are typically considered as the most important component in improving the pseudocapacitive properties, involve transition metal oxides/dichalcogenides, MXenes, conducting polymers, etc. − Among them, spinel manganites have emerged as the promising candidates because of their abundant availability, low cost, ease of fabrication, eco-benignity, and battery-type electrochemical charge storage behavior that can achieve a high theoretical capacitance. − However, the practical applications of Mn 3 O 4 have been greatly limited due to its intrinsic low electrical conductivity and sluggish kinetics. − Incorporation of a different cation (XMn 2 O 4 ) results in the presence of abundant redox-active sites and multiple valence states, thus leading to attractive redox chemistry and enhanced charge storage capability. The bimetallic compositional feature also induces synergistic effects between Mn and substituted cation, which leads to efficient charge transfer. − Although making nanoscale − and composite materials ,− has been widely used as effective modification approaches to enlarge surface area and facilitate ion diffusion, deciphering the host and substitutional cations’ local coordination structures is a more fundamental strategy to improve their charge storage properties.…”