Defect chemistry of p-type perovskite oxide La0.2Sr0.8FeO3-δ: a combined experimental and computational study

Bae, Hohan; Shin, Yonghun; Mathur, Lakshya; Lee, Donghwa; Song, Sun-Ju

doi:10.1007/s43207-022-00237-6

Cited by 8 publications

(1 citation statement)

References 56 publications

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“…In this study, we aimed to modify the surface of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ (LSCF), a state-of-the-art cathode material, 26 using Ar plasma treatment to create an oxygen electrode with high catalytic activity and durability. The effects of the Ar plasma treatment on the surface phase separation phenomenon and electrochemical properties were investigated by analyzing the corresponding changes in surface structure and chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Enhanced catalytic activity and stability of SOFC electrodes through plasma-driven surface modification

Shin,

Seo,

Jeon

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Enhanced catalytic activity and stability of SOFC electrodes through plasma-driven surface modification

Shin,

Seo,

Jeon

et al. 2024

J. Mater. Chem. A

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Concurrent Amorphization and Nanocatalyst Formation in Cu‐Substituted Perovskite Oxide Surface: Effects on Oxygen Reduction Reaction at Elevated Temperatures

Jeon,

Jung,

Bae

et al. 2024

Advanced Materials

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The activity and durability of chemical/electrochemical catalysts are significantly influenced by their surface environments, highlighting the importance of thoroughly examining the catalyst surface. Here, Cu‐substituted La0.6Sr0.4Co0.2Fe0.8O3‐δ is selected, a state‐of‐the‐art material for oxygen reduction reaction (ORR), to explore the real‐time evolution of surface morphology and chemistry under a reducing atmosphere at elevated temperatures. Remarkably, in a pioneering observation, it is discovered that the perovskite surface starts to amorphize at an unusually low temperature of approximately 100 °C and multicomponent metal nanocatalysts additionally form on the amorphous surface as the temperature raises to 400 °C. Moreover, this investigation into the stability of the resulting amorphous layer under oxidizing conditions reveals that the amorphous structure can withstand a high‐temperature oxidizing atmosphere (≥650 °C) only when it has undergone sufficient reduction for an extended period. Therefore, the coexistence of the active nanocatalysts and defective amorphous surface leads to a nearly 100% enhancement in the electrode resistance for the ORR over 200 h without significant degradation. These observations provide a new catalytic design strategy for using redox‐dynamic perovskite oxide host materials.

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Recent progress in electrolyte-supported solid oxide fuel cells: a review

Mathur

Namgung

Kim

et al. 2023

J. Korean Ceram. Soc.

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Defect chemistry of p-type perovskite oxide La0.2Sr0.8FeO3-δ: a combined experimental and computational study

Cited by 8 publications

References 56 publications

Enhanced catalytic activity and stability of SOFC electrodes through plasma-driven surface modification

Enhanced catalytic activity and stability of SOFC electrodes through plasma-driven surface modification

Concurrent Amorphization and Nanocatalyst Formation in Cu‐Substituted Perovskite Oxide Surface: Effects on Oxygen Reduction Reaction at Elevated Temperatures

Recent progress in electrolyte-supported solid oxide fuel cells: a review

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