Structural and electrical characterization of the Co-doped Ca2Fe2O5 brownmillerite: Evaluation as SOFC -cathode materials

Cascos, Vanessa; Martínez-Coronado, R.; Alonso, J. A.; Fernández‐Díaz, M. T.

doi:10.1016/j.ijhydene.2015.01.067

Cited by 30 publications

(19 citation statements)

References 28 publications

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“…The data also reveal that the magnitude of OER current systematically increases with the increasing Co content ( x ). In addition, the electrical conductivity was found to be enhanced in Co‐rich ( x= 0.75 and 1.0) samples (Figure S7), consistent with the report of Cascos et al . Thus, the remarkable OER activity of CFCO can be explained partly by its improved electrical conductivity.…”

Section: Figuresupporting

confidence: 90%

Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

et al. 2017

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Here, we report remarkable oxygen evolution reaction (OER) catalytic activity of brownmillerite (BM)-type Ca FeCoO . The OER activity of this oxide is comparable to or beyond those of the state-of-the-art perovskite (PV)-catalyst Ba Sr Co Fe O (BSCF) and a precious-metal catalyst RuO , emphasizing the importance of the characteristic BM structure with multiple coordination environments of transition metal (TM) species. Also, Ca FeCoO is clearly advantageous in terms of expense/laboriousness of the material synthesis. These facts make this oxide a promising OER catalyst used in many energy conversion technologies such as metal-air secondary batteries and hydrogen production from electrochemical/photocatalytic water splitting.

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Section: Figuresupporting

confidence: 90%

Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

et al. 2017

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“…For instance, CaFeO 2.5 exhibits a brownmillerite‐type structure, which is better described with the formula Ca 2 Fe 2 O 5 . [ 34,35 ] The crystal structure contains an ordered framework of FeO 6 octahedra and FeO 4 tetrahedra, arranged in layers, as illustrated in Figure 2f. Indeed, the occurrence of long range oxygen ordering is, in general, adverse for the oxygen diffusion, and hence, totally disordered structures are preferred in energy conversion materials with oxide‐ion diffusion properties.…”

Section: Structure Defect Chemistry and Transport Properties Of Permentioning

confidence: 99%

Recent Advances in Perovskite‐Type Oxides for Energy Conversion and Storage Applications

Sun

Alonso

Bian

2020

Advanced Energy Materials

370

192

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Professor John B. Goodenough started his research on perovskite‐type oxides working on random‐access memory with ceramic [La,M(II)]MnO3 in the Lincoln Laboratory, Massachusetts Institute of Technology, more than 60 years ago. Since then perovskite‐type oxides have played vital roles in the field of energy conversion and storage. In this review, a brief overview is given on the structure, defect chemistry, and transport properties of perovskite oxides, especially the mixed‐valent materials with mixed electronic and ionic conductivities. The recent advances of perovskite oxides applications in the oxygen reduction reaction, oxygen evolution reaction, electrochemical water splitting reaction, metal–air batteries, solid‐state batteries, oxygen separation membranes, and solid oxide fuel cells are highlighted. Moreover, some novel design strategies for optimizing performance, like interface engineering, defect engineering, strain modulation are discussed as well. Finally, a perspective is given on how to design high‐performance perovskite oxide based materials for energy conversion and storage applications as well as the challenges involved in this task.

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“…[ 13,14 ] The BM structure is categorized as an oxygen‐deficiency‐ordered perovskite‐type structure containing a layered arrangement of octahedral (Oh) BO 6 and tetrahedral (Td) BO 4 . [ 15–18 ] Such Oh‐ and Td‐sites are likely to play distinct roles in the enhanced OER activity: the former mainly decreases the overpotential, and the latter enhances the OER current. [ 13 ] Therefore, BM‐type CFCO is expected to act as a new active cocatalyst for OER by combination with photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Brownmillerite‐Type Crystalline Ca₂FeCoO₅ Ultrasmall Particles with Single‐Nanometer Dimensions as an Active Cocatalyst for Oxygen Photoevolution Reaction

Tsuji

Nanbu

Degami

et al. 2020

Part & Part Syst Charact

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transfer processes. [2,3] For highly efficient water splitting method, we believe it is quite important to find an effective photocatalyst for OER. Many researchers have attempted to improve photocatalytic activity by loading cocatalysts, which are active for the OER step on photocatalysts or semiconductors. [1][2][3] Although noble metal oxides such as RuO 2 [4,5] and IrO 2 [6] show higher catalytic activity for OER and have also been used as cocatalysts of photocatalysts, the lack of sufficient reserves prohibits their large-scale uses. Therefore, it is necessary to find a promising OER cocatalyst consisting of only transition metal elements. Among transition metal cocatalysts, cobalt-containing materials, such as cobalt oxides (CoO x ) [8][9][10] and cobalt phosphate (Co-Pi), [11,12] are ones of the most frequently studied as the OER cocatalysts, whereas their OER activity are not higher than those of the noble metal oxides. Recently we found that brownmillerite (BM)-type Ca 2 FeCoO 5 (CFCO) possessed higher catalytic OER activity than the noble metal oxides in an alkaline solution. [13,14] The BM structure is categorized as an oxygen-deficiencyordered perovskite-type structure containing a layered arrangement of octahedral (Oh) BO 6 and tetrahedral (Td) BO 4 . [15][16][17][18] Such Oh-and Td-sites are likely to play distinct roles in the enhanced OER activity: the former mainly decreases the overpotential, and the latter enhances the OER current. [13] Therefore, BM-type CFCO is expected to act as a new active cocatalyst for OER by combination with photocatalysts.In general, the particle size of cocatalyst is several nanometers due to increasing interface between the parent catalyst and the cocatalyst, and exposure of the active sites. [4][5][6][7][8][9][10][11][12] For example, Liu et al. reported size influence of metal oxide cocatalysts on photocatalytic activity of TiO 2 nanosheets for OER. [19] Charge-transfer process in TiO 2 was significantly accelerated by loading the metal oxides clusters with ≈2 nm diameter, leading to enhance the photocatalytic water oxidation rate to oxygen. In solutions, on the other hand, nanometric oxide particles have been utilized as the OER cocatalysts. [20][21][22][23] For example, Maeda and co-workers reported OER catalytic activity of Fe(III)-Cr(III) oxide solid solution [20] combined with PdCrO x[21] on SrTiO 3Brownmillerite-type Ca 2 FeCoO 5 (CFCO) is one of the most effective catalysts for oxygen evolution reaction (OER), comparable with noble metal oxides. In this study, crystalline CFCO ultrasmall particles with nanometric dimension are synthesized by a reverse micelle method on TiO 2 nanoparticles. The particle size decreases with decreasing molar ratio of water to surfactant. The precursors of CFCO must be calcined after loading on TiO 2 nanoparticles to achieve CFCO ultrasmall particles with several nanometers in size. Interaction between the precursors and TiO 2 is speculated to suppress aggregation of the precursors during calcination. The photocatalytic activity...

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Structural and electrical characterization of the Co-doped Ca2Fe2O5 brownmillerite: Evaluation as SOFC -cathode materials

Cited by 30 publications

References 28 publications

Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

Recent Advances in Perovskite‐Type Oxides for Energy Conversion and Storage Applications

Brownmillerite‐Type Crystalline Ca₂FeCoO₅ Ultrasmall Particles with Single‐Nanometer Dimensions as an Active Cocatalyst for Oxygen Photoevolution Reaction

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Structural and electrical characterization of the Co-doped Ca2Fe2O5 brownmillerite: Evaluation as SOFC -cathode materials

Cited by 30 publications

References 28 publications

Brownmillerite‐type Ca2FeCoO5 as a Practicable Oxygen Evolution Reaction Catalyst

Brownmillerite‐type Ca2FeCoO5 as a Practicable Oxygen Evolution Reaction Catalyst

Recent Advances in Perovskite‐Type Oxides for Energy Conversion and Storage Applications

Brownmillerite‐Type Crystalline Ca2FeCoO5 Ultrasmall Particles with Single‐Nanometer Dimensions as an Active Cocatalyst for Oxygen Photoevolution Reaction

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Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

Brownmillerite‐type Ca₂FeCoO₅ as a Practicable Oxygen Evolution Reaction Catalyst

Brownmillerite‐Type Crystalline Ca₂FeCoO₅ Ultrasmall Particles with Single‐Nanometer Dimensions as an Active Cocatalyst for Oxygen Photoevolution Reaction