Cobalt Ferrite Nanocrystallites for Sustainable Hydrogen Production Application

Gaikwad, Rajendra S.; Chae, Sang Youn; Mane, Rajaram S.; Han, Sung‐Hwan; Joo, Oh‐Shim

doi:10.4061/2011/729141

Cited by 44 publications

(8 citation statements)

References 32 publications

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“…It is important to point out that α-Fe 2 O 4 is often found as a secondary phase in spinel synthesis, as previously reported by Sun et al 62 and Mathew et al CuFe 2 O 4 crystallitesshow mean size between 32 and 35 nm, much lower than the value proposed by Sun ıet al,62 that estimated the range in between 75 -110 nm for the ferrites. In opposition, CoFe 2 O 4 crystallite sizes were in the range 28 -37 nm, being also smaller than those reported by Gaikwad et al,75 i.e., 60 -80 nm, but bigger than the one obtained by Valdés-Solís et al,76 that was 20 nm.…”

contrasting

confidence: 62%

Cobalt Substitution in CuFe$_{2}$O$_{4}$ spinel and its influence on the crystal structure and phonons

Silva¹,

Silva²,

Sinfrônio³

et al. 2013

Preprint

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In this work nanometric spinel Co 1−x Cu x Fe 2 O 4 powders were obtained by polymeric precursors method at several annealing temperatures between 700 and 1200 • C. The samples were characterized by means of X-ray powder diffraction, confirming the ideal inverse spinel structure for CoFe 2 O 4 sample and the tetragonal distorted inverse spinel structure for CuFe 2 O 4 sample. Based on FWHM evaluation, we estimated that crystallite sizes varies between 27 and 37 nm for the non-substituted samples. The optical-active modes were determined by infrared and Raman spectroscopies. The phonon spectra showed a local tetragonal distortion for mixed samples.

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contrasting

confidence: 62%

Cobalt Substitution in CuFe$_{2}$O$_{4}$ spinel and its influence on the crystal structure and phonons

Silva¹,

Silva²,

Sinfrônio³

et al. 2013

Preprint

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“…Transition metal ferrites, both doped and undoped, are attractive candidates for a wide range of applications including catalysis (Lu et al, 2011), sustainable hydrogen production application (Gaikwad et al, 2011) and electronic and magnetic devices, among others. Their great advantage for catalytic purposes is that they are generally magnetic and can be easily recovered after completion of reactions using a magnet (Choon Woo Lim, In Su Lee, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mini-review: Ferrite nanoparticles in the catalysis

Kharisov

Dias

Kharissova

2019

Arabian Journal of Chemistry

279

118

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Recent applications of ferrite nanoparticles as catalysts in organic processes are reviewed. Catalytic applications include the use of mainly cobalt, nickel, copper, and zinc ferrites, as well as their mixed-metal combinations with Cr, Cd, Mn and sometimes some lanthanides. Core-shell nanostructures with silica and titania are also used without loss of magnetic properties. The ferrite nanomaterials are obtained mainly by wet-chemical sol-gel or co-precipitation methods, more rarely by sonochemical technique, mechanical high-energy ball milling, spark plasma sintering, microwave heating or hydrothermal route. Catalytic processes with application of ferrite nanoparticles include decomposition (in particular photocatalytic), reactions of dehydrogenation, oxidation, alkylation, C-C coupling, among other processes. Ferrite nano catalysts can be easily recovered from reaction systems and reused up to several runs almost without loss of catalytic activity.

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“…Spinel ferrites (MFe 2 O 4 ) have hereof been in the spotlight of many research groups for their applicability in modern electric devices, [2] such as sensors [3], memories [4] and in the medical field. [5] Owing to their high coercivity, moderate saturation magnetization, [6] mechanical hardness and excellent chemical stability, [7,8] these materials are nowadays highly popular for applications in magnetic and magneto-optical devices.…”

Section: Introductionmentioning

confidence: 99%