Tunable Ferrites as Environmentally Friendly Materials for Energy‐Efficient Processes

Álvarez-Serrano, I.; Arillo, Marı́a Ángeles; López, Marı́a Luisa; Veiga, M.L.; Pico, C.

doi:10.1002/adma.201101727

Cited by 12 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

The design of high-efficiency non-noble bifunctional electrocatalysts for oxygen evolution reaction and hydrogen evolution reaction is paramount for water splitting technologies and associated renewable energy systems. Spinel-structured oxides with rich redox properties can serve as alternative low-cost electrocatalysts. However, the spinel-structured oxides is a typical electrocatalyst for OER but with poor HER performance. In this work, zirconium regulation in threedimensional (3D) CoFe 2 O 4 (CoFeZr oxides) nanosheets on nickel foam (NF) as a novel strategy inducing bifunctionality toward OER and HER for overall water splitting is reported. The results demonstrate that the incorporation of Zr into CoFe 2 O 4 can tune the nanosheet morphology and electronic structure around Co and Fe sites for optimizing adsorption energies, thus effectively enhancing the intrinsic activity of active sites. The as-synthesized optimal electrocatalyst of 3D CoFeZr oxides nanosheets exhibited high OER activity with small overpotential, low Tafel slope and good stability. Moreover, the CoFeZr oxide nanosheets showed unprecedented HER activity with a small overpotential of 104 mV at 10 mA cm −2 in alkaline media, which is better than ever reported This article is protected by copyright. All rights reserved.3 spinel-structured oxides. When employing the CoFeZr oxides nanosheets as both anode and cathode catalysts for overall water splitting, a current density of 10 mA cm 2 was achieved at the cell voltage of 1.63 V in 1.0 M KOH. The results demonstrate that such favorable OER and HER activity can be attributed to fast electron transportation, improved electrical conductivity and optimal electronic structure.

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

“…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.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

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

et al. 2013

Self Cite

View full text Add to dashboard Cite

Samples of spinel type oxides Li((4-x)/3)Mn((5-2x)/3)Fe(x)O4 (x = 0.5 and x = 0.7) were prepared by combining sol-gel processes and further thermal treatments. The structure and microstructure were characterized by different techniques (XRD, SEM and HRTEM) showing a cubic spinel-type structure, S.G. Fd3m in all cases. Complementary techniques were used to determine composition (EDS, EELS and TGA). Electrochemical properties were studied from charge/discharge measurements and supported by impedance spectroscopy analysis. Optimal results were obtained for the x = 0.7 sample treated at 500 °C that reached a capacity of 185 mAh g(-1) at a charge rate of C/10; this value implies an enhancement of 60% in capacity with respect to the minimum value registered in a similar composition. The observed response has been related both to microstructural aspects, i.e. morphology and particle size, and to the amount of Mn(3+), suggesting that nano-sizes lead to better electrochemical behavior. Both samples used as cathodes showed a good cycling efficiency, only with a slight loss of capacity and a coulombic efficiency close to 95%.

show abstract

ChemInform Abstract: Tunable Ferrites as Environmentally Friendly Materials for Energy‐Efficient Processes

et al. 2011

View full text Add to dashboard Cite

show abstract

Tunable Ferrites as Environmentally Friendly Materials for Energy‐Efficient Processes

Cited by 12 publications

References 28 publications

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

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

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

ChemInform Abstract: Tunable Ferrites as Environmentally Friendly Materials for Energy‐Efficient Processes

Contact Info

Product

Resources

About