Oxygen evolution electrocatalysis in alkaline medium at thin MnxCo3-xO4 (0 ≤ x ≤ 1) spinel films on glass / SnO2: F prepared by spray pyrolysis

Rı́os, E.; Chartier, P.; Gautier, J.L.

doi:10.1016/s1293-2558(00)80081-3

Cited by 59 publications

(37 citation statements)

References 19 publications

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“…Meanwhile, as shown in Figure S5 (Supporting Information), M‐CoO/CoFe LDHs possess the highest Co 3+ content among the hybrids with different CoO populations, suggesting that the Co 3+ sites are responsible to the enhancement of OER activity. According to previous studies, Co 3+ ions in the oxides have been well recognized as the active sites for electrochemical water oxidation, which has been generally ascribed to its lower coordination number and larger H 2 O molecules adsorption energy, leading to promoted deprotonation of OOH species and thus O 2 generation . The lower Co 3+ contents in H‐CoO/CoFe LDHs could be interpreted as follows.…”

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confidence: 96%

Strongly Coupled CoO Nanoclusters/CoFe LDHs Hybrid as a Synergistic Catalyst for Electrochemical Water Oxidation

Zuo-ning

Chen

et al. 2018

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Exploiting high-performance, robust, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is crucial for electrochemical energy storage and conversion technologies. Engineering the interfacial structure of hybrid catalysts often induces synergistically enhanced electrocatalytic performance. Herein, a new strongly coupled heterogeneous catalyst with proper interfacial structures, i.e., CoO nanoclusters decorated on CoFe layered double hydroxides (LDHs) nanosheets, is prepared via a simple one-step pulsed laser ablation in liquid method. Thorough spectroscopic characterizations reveal that strong chemical couplings at the hybrid interface trigger charge transfer from Co in the oxide to Fe in the LDHs through the interfacial FeOCo bond, leading to considerable amounts of high oxidation state Co sites present in the hybrid. Interestingly, the CoO/CoFe LDHs exhibit pronounced synergistic effects in electrocatalytic water oxidation, with substantially enhanced intrinsic catalytic activity and stability relative to both components. The hybrid catalyst achieves remarkably low OER overpotential and Tafel slope in alkaline medium, outperforming that of Ru/C and manifesting itself among the most active Co-based OER catalysts.

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confidence: 96%

Strongly Coupled CoO Nanoclusters/CoFe LDHs Hybrid as a Synergistic Catalyst for Electrochemical Water Oxidation

Zuo-ning

Chen

et al. 2018

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“…Furthermore, the observation made from X-ray absorption near edge structure (XANES) analysis has suggested that Co 3+ is indeed the active site for water oxidation. [96,100,101] The substitution of Mn 3+ in the octahedral sites in the case of tetragonal CoMn 2 O 4 provides fewer active sites for oxygen evolution reactions. [102] However, the tetrahedral sites of spinels are known to be the catalytic sites for the ORR.…”

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confidence: 99%

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

et al. 2014

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Recently, there has been much interest in the design and development of affordable and highly efficient oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalysts that can resolve the pivotal issues that concern solar fuels, fuel cells, and rechargeable metal-air batteries. Here we present the synthesis and application of porous CoMn2 O4 and MnCo2 O4 spinel microspheres as highly efficient multifunctional catalysts that unify the electrochemical OER with oxidant-driven and photocatalytic water oxidation as well as the ORR. The porous materials were prepared by the thermal degradation of the respective carbonate precursors at 400 °C. The as-prepared spinels display excellent performances in electrochemical OER for the cubic MnCo2 O4 phase in comparison to the tetragonal CoMn2 O4 material in an alkaline medium. Moreover, the oxidant-driven and photocatalytic water oxidations were performed and they exhibited a similar trend in activity to that of the electrochemical OER. Remarkably, the situation is reversed in ORR catalysis, that is, the oxygen reduction activity and stability of the tetragonal CoMn2 O4 catalyst outperformed that of cubic MnCo2 O4 and rivals that of benchmark Pt catalysts. The superior catalytic performance and the remarkable stability of the unifying materials are attributed to their unique porous and robust microspherical morphology and the intrinsic structural features of the spinels. Moreover, the facile access to these high-performance materials enables a reliable and cost-effective production on a large scale for industrial applications.

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“…The higher temperature weight losses are indicative of reduction of the cobalt manganese oxide. The sample calcined at 673 K loses *25 % of its weight which is equivalent to full reduction of the (Co,Mn)(Co,Mn) 2 temperature increases the amount of oxygen reduces such that after calcination at 873 K only half of the oxygen is removed (equivalent to two oxygen atoms) in two events at 600 and 728 K. This would in principle reduce all cobalt and manganese ions to Co 2? and Mn 2?…”

Section: Resultsmentioning

confidence: 99%

“…Co(NO 3 ) 2 Na 2 CO 3 (1 M) added dropwise until the pH of the solution reached 10. The solution was then left stirring at 348 K for 2 h to complete the reaction.…”

Section: Methodsmentioning

confidence: 99%

“…The spinel structure can also crystallize in either a cubic or tetragonal form, with the tetragonal form being generated by a JahnTeller deformation of the octahedral. Spinels have a wide variety of uses, for example, they can be used, as catalysts for oxygen evolution reaction [1][2][3], reduction of nitrogen oxides, oxidation of CO, hydrocarbons [4], decomposition of NO and hydrogenation of CO [5], as thermistors and as infrared sensors [6].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Muneam

Hadi²,

Kareem³

et al. 2016

Int J Ind Chem

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A (Co,Mn)(Co,Mn) 2 O 4 /MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn) 2 O 4 /MgO by 773 K. The catalyst had a surface area of 45 m 2 g -1 in the fully calcined state (873 K) and was characterized by XRD and TGA. Characterization by TPR of the catalyst calcined at different temperatures revealed an annealing process that lowered the surface energy of the catalyst thereby inhibiting reduction. The calcined catalyst was active for the dehydrogenation of isopropanol to acetone and propene with the peak reaction temperature *428 K and a second reaction zone around 613 K related to strongly bound alcohol. Lattice oxygen was reactive from 463 K converting adsorbed alcohol into carbon dioxide.

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Oxygen evolution electrocatalysis in alkaline medium at thin MnxCo3-xO4 (0 ≤ x ≤ 1) spinel films on glass / SnO2: F prepared by spray pyrolysis

Cited by 59 publications

References 19 publications

Strongly Coupled CoO Nanoclusters/CoFe LDHs Hybrid as a Synergistic Catalyst for Electrochemical Water Oxidation

Strongly Coupled CoO Nanoclusters/CoFe LDHs Hybrid as a Synergistic Catalyst for Electrochemical Water Oxidation

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

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