Novel method of preparing hierarchical porous CoFe2O4 by the citric acid-assisted sol-gel auto-combustion for supercapacitors

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

“…Ltd), Fe(NO 3 ) 3 $9H 2 O ($98.5% purity, sourced from Qualikems), and C 6 H 8 O 7 ($99.5% purity, sourced from Oxford Lab Fine Chem LLP) have been adjusted in weights, such that the ratios of the used anhydrous citric acid to trivalent metal ions to and divalent metal ions were 3 : 2 : 1. [39][40][41] These nitrate salts were dissolved in distilled water and stirred for 15 minutes without heating to create a homogeneous mixture before adding the citric acid. Finally, ammonium hydroxide was added to the mix in drops while the stirring continued until the pH reached approximately 7.0.…”

Peroxymonosulfate activation using CoFe2O4/Fe2O3 nanocomposite for Acid Orange removal

“…e results of the FTIR spectra implied that all the catalyst have the same functional groups, and the formation of Me-O bonds are successful. [19,20].…”

“…Several diffraction peaks were observed at 2θ = 30.2°, 35.7°, 43.4°, 57.0° and 62.8°, which were assigned to (220), (311), (400), (511) and (440) crystal planes of the spinel CoFe 2 O 4 respectively (JCPDS No. 22-1086)[19,20].e results indicated that CoFe 2 O 4 nanocomposite has been successfully obtained. e intensity of diffraction peaks were less distinctive compared to the reported XRD pa erns by[21,22], suggesting that the formation of CoFe 2 O 4 had a low crystallinity.…”

One-Step Rapid Conversion of Electroactive CoMnO Nanostructures Using a Deep Eutectic Solvent as the Template, Solvent, and Source

“…The specific capacitance decreases slightly till 5000 cycles and further increases possibly due to changes in the morphology of CoMnO material as reported previously. 47 In all our samples, high-temperature synthesis 239 F g −1 at 0.5 A g −1 1000 cycles (76%) 49 3 MnFeO x -110 two-step hydrothermal synthesis high temperature and pressure 224.6 F g −1 at 1 A g −1 4000 cycles at 10 A g −1 (94.6%) 50 4 MnCo 2 O4 coprecipitation method use of hazardous chemicals 381 F g −1 at 1 A g −1 5000 cycles at 5 A g −1 (68%) 51 5 CoFe 2 O 4 sol−gel combustion followed by calcination use of hazardous chemicals and high temperatures 358.67 F g −1 at 1 A g −1 6000 cycles at 10 A g −1 (56.28%) 52 6 Co 0.5 Mn 0.5 S sonication followed by calcination high-temperature synthesis 893.3 F g −1 at 1.0 A g −1 2000 cycles at 10 A g −1 (90.19%) 53…”