Tunable Ferrites as Environmentally Friendly Materials for Energy‐Efficient Processes

Abstract

Novel materials and methods of synthesis in the field of energy conversion and economy are reported. The main goal is to prepare and characterize Li(4 − x)Mn(5 − 2x)Fe3xO12 compounds. These compounds crystallize in a spinel‐type structure, AB2O4, in which the cationic location in the A and B sublattices drives the potential application of these materials in two current prominent research fields: magnetic refrigeration and lithium batteries. This solid solution is revealed as a tunable system that nicely permits a specific response to be highlighted, depending on the composition and particle size: the magnetocaloric effect or active electrochemical behavior.

Zirconium‐Regulation‐Induced Bifunctionality in 3D Cobalt–Iron Oxide Nanosheets for Overall Water Splitting

“…Among the above-mentioned electrocatalysts, spinel-structured oxides of AB 2 O 4 (A, B = metal) are composed of a cubic tightly packed array of O 2 , in which A 2 and B 3 occupy the tetrahedron and octahedron sites, respectively. [20,21] Due to their low cost, high stability and rich redox properties, spinel-structured oxides have attracted much attention in various fields. [22,23] Particularly, cobalt-iron oxides (CoFe 2 O 4 ) has been reported as promising electrocatalysts for OER, whereas its catalytic activity for HER is rarely reported to date.…”

Electrochemical performance of Li(4−x)/3Mn(5−2x)/3FexO4 (x = 0.5 and x = 0.7) spinels: effect of microstructure and composition

“…A concomitant effect is that the insertion of Li + ions in the 16c octahedral vacant positions becomes progressively blocked as the 8a tetrahedral sites are being occupied by metal transition cations. 29 With the aim to study the effect of Fe 3+ content in the title phases on their electrochemical properties, and considering that its reduction voltage 6,7 is 4.7-5.0 V, both cathodes were tested between 2.5 and 5.0 V. The voltage vs. capacity resulting curves (Fig. 14 and 15, and in S5 † for a detailed cycle) have in common the high potential plateau whatever the thermal treatment was.…”