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240809s2024 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202404103
|2 doi
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|a pubmed24n1496.xml
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|a (DE-627)NLM376078391
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|a (NLM)39120472
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|a DE-627
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|a eng
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|a Jeon, SungHyun
|e verfasserin
|4 aut
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|a Concurrent Amorphization and Nanocatalyst Formation in Cu-Substituted Perovskite Oxide Surface
|b Effects on Oxygen Reduction Reaction at Elevated Temperatures
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|c 2024
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|a Text
|b txt
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 09.08.2024
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a © 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH.
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|a 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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|a Journal Article
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|a ex‐solution
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|a in situ observation
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|a oxygen reduction reaction
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|a solid oxide fuel cell
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|a surface amorphization
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|a Jung, Wan-Gil
|e verfasserin
|4 aut
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|a Bae, Hohan
|e verfasserin
|4 aut
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|a Ahn, Sejong
|e verfasserin
|4 aut
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|a Koo, Bonjae
|e verfasserin
|4 aut
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|a Yu, WonJeong
|e verfasserin
|4 aut
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|a Kim, Seunghyun
|e verfasserin
|4 aut
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|a Oh, DongHwan
|e verfasserin
|4 aut
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|a Kim, Uisik
|e verfasserin
|4 aut
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|a Barnett, Scott A
|e verfasserin
|4 aut
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|a Seo, Jongsu
|e verfasserin
|4 aut
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|a Kim, Bong-Joong
|e verfasserin
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|a Jung, WooChul
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g (2024) vom: 09. Aug., Seite e2404103
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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|g year:2024
|g day:09
|g month:08
|g pages:e2404103
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|u http://dx.doi.org/10.1002/adma.202404103
|3 Volltext
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