Effect of La and Gd substitution in BaFeO3-δ perovskite structure on its catalytic performance for thermochemical water splitting

Ngoensawat, A.; Tongnan, Vut; Laosiripojana, Navadol; Kim-Lohsoontorn, Pattaraporn; Hartley, Unalome Wetwatana

doi:10.1016/j.catcom.2019.105901

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…Perovskite type mixed metal oxide compound, such as barium ferrite oxide, possesses good chemical and thermal stability under severe conditions, besides high oxygen storage capacity (OSC) and reducibility [79]. The addition of La 3+ and Ga 3+ to BaFeO 3-δ was investigated in water splitting, and the best performance was obtained with Ba 0.95 La 0.05 FeO 3-δ , showing a H 2 production of about 1310 µmol•g −1 at 900 • C. Probably the smaller La 3+ ionic radius compared to Ba 2+ can lead to a larger lattice free volume for oxygen transport.…”

Section: Thermochemical Water Splittingmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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Due to its characteristics, hydrogen is considered the energy carrier of the future. Its use as a fuel generates reduced pollution, as if burned it almost exclusively produces water vapor. Hydrogen can be produced from numerous sources, both of fossil and renewable origin, and with as many production processes, which can use renewable or non-renewable energy sources. To achieve carbon neutrality, the sources must necessarily be renewable, and the production processes themselves must use renewable energy sources. In this review article the main characteristics of the most used hydrogen production methods are summarized, mainly focusing on renewable feedstocks, furthermore a series of relevant articles published in the last year, are reviewed. The production methods are grouped according to the type of energy they use; and at the end of each section the strengths and limitations of the processes are highlighted. The conclusions compare the main characteristics of the production processes studied and contextualize their possible use.

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Section: Thermochemical Water Splittingmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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“…Extensively studied for its potential as a cathode material [8], theoretical studies imply that BaFeO 3 has proton as well as hydroxide ion affinity and hydration energy comparable to the proton conductors like BaCeO 3 and BaZrO 3 [9]. Possessing a tolerance factor greater than 1, BaFeO 3 exists in mixed phases (i.e., cubic, hexagonal and orthorhombic) [10]. A cubic BaFeO 3 having (cubicclose packed) ccp stacking of BaO 3−d layers favours ionic conduction [11].…”

Section: Introductionmentioning

confidence: 99%

Unravelling the La dopant induced physicochemical changes and the electrical behaviour on BaFeO₃ under oxidising and reducing atmospheres

Prabhahari,

Raja,

Iniyan

et al. 2024

Phys. Scr.

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Electroceramic oxides like La-doped BaFeO3 garner greater interest owing to their tunability of mixed ionic conduction. However, reports on the effect of La on the microstructural changes, the type of conduction mechanism under different atmospheres and the negative charge transfer influenced by the Fe-O hybridization in Ba1-xLaxFeO3-δ are hardly available. Doping La induces cation vacancies and Fe reduction, creating nanorod decorated surface after the high-temperature treatment. Conductivity studies expose the rate-limiting steps for hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) as the ohmic resistances and Ba segregation effects. Among the samples studied, Ba0.9La0.1FeO3-δ performs better at 800˚C with an activation energy of ∼ 0.35 eV under both oxidizing and reducing atmospheres. Surface analysis after EIS reveals Fe and O with different oxidation states that enhance the total conductivity. The amount of hydroxyl species retained (23.66% for Ba0.9La0.1FeO3-δ) and the ratio of the adsorbed to the lattice oxygen (15.33% for Ba0.9La0.1FeO3-δ) gives insight on HOR and ORR activities. Also, computational studies validated the negative charge transfer mechanism of the samples under thermally assisted oxidation The. results indicate Ba0.9La0.1FeO3-δ as a tuneable electrode for solid oxide cells.

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“…The A-site and B-site ions can bond with 12 oxygen atoms and six oxygen atoms to form the densest cubic packing in the perovskite structure, respectively. This structural and compositional richness of perovskite can provide great opportunities to modulate the geometric and electronic structure of perovskite catalysts, so that could optimize its OER catalytic performance. − In addition, perovskite could allow some elements to exist in abnormal states, such as oxygen with nonstoichiometric ratio and the active metal of the A/B site to exist in a mixed valence state. , This will obtain the distinctive chemical properties and generate abundant oxygen vacancies in perovskite, which are beneficial to achieve higher catalytic performance. Furthermore, perovskite with multiple elements coexisting at the B site has been proven to significantly optimize lattice parameters, structural stability, and e g electron filling of surface transition metal cations associated with catalytic activity, compared with the original perovskite. , The most typical perovskite oxide used as an OER catalyst is BaSrCoFeO x …”

Section: Introductionmentioning

confidence: 99%

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

Wei

Wang

2022

Energy Fuels

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Alkaline water splitting is a technique utilizing renewable resource-derived electricity to generate hydrogen with high purity. The oxygen evolution reaction (OER) with sluggish dynamics is the crucial half-reaction toward electrocatalytic water splitting, which needs a non-noble metal catalyst with high performance to make the reaction process be more energy-efficient and economical. Perovskite, as a kind of price moderate, compositional adjustable, structurally stable, and highly active material, has been widely used as the catalyst for the OER under alkaline conditions. In this review, we systematically expound the OERrelated catalytic mechanism, provide the evaluative criteria of catalytic performance, and then summarize the corresponding measurement methods of catalysts for the alkaline OER. Furthermore, our emphasis is given to the synthetic methods, the activity descriptors, and the performance optimization strategies of perovskite-based catalysts. Finally, we present a number of future directions on the development of more highly efficient perovskite-based catalysts for the alkaline OER.

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Effect of La and Gd substitution in BaFeO3-δ perovskite structure on its catalytic performance for thermochemical water splitting

Cited by 14 publications

References 26 publications

Main Hydrogen Production Processes: An Overview

Main Hydrogen Production Processes: An Overview

Unravelling the La dopant induced physicochemical changes and the electrical behaviour on BaFeO₃ under oxidising and reducing atmospheres

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

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Effect of La and Gd substitution in BaFeO3-δ perovskite structure on its catalytic performance for thermochemical water splitting

Cited by 14 publications

References 26 publications

Main Hydrogen Production Processes: An Overview

Main Hydrogen Production Processes: An Overview

Unravelling the La dopant induced physicochemical changes and the electrical behaviour on BaFeO3 under oxidising and reducing atmospheres

Recent Advances on Perovskite Electrocatalysts for Water Oxidation in Alkaline Medium

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Unravelling the La dopant induced physicochemical changes and the electrical behaviour on BaFeO₃ under oxidising and reducing atmospheres