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231226s2023 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202301310
|2 doi
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|a pubmed25n1189.xml
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|a (DE-627)NLM356987507
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|a (NLM)37196181
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|a eng
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|a Wang, Zichen
|e verfasserin
|4 aut
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|a Tailored Lattice Compressive Strain of Pt-Skins by the L12 -Pt3 M Intermetallic Core for Highly Efficient Oxygen Reduction
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|c 2023
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|a Text
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 07.09.2023
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2023 Wiley-VCH GmbH.
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|a The sluggish kinetics of oxygen reduction reaction (ORR) and unsatisfactory durability of Pt-based catalysts are severely hindering the commercialization of proton-exchange-membrane fuel cells (PEMFCs). In this work, the lattice compressive strain of Pt-skins imposed by Pt-based intermetallic cores is tailored for highly effective ORR through the confinement effect of the activated nitrogen-doped porous carbon (a-NPC). The modulated pores of a-NPC not only promote Pt-based intermetallics with ultrasmall size (average size of <4 nm), but also efficiently stabilizes intermetallic nanoparticles and sufficient exposure of active sites during the ORR process. The optimized catalyst (L12 -Pt3 CoML-Pt/NPC10 ) achieves excellent mass activity (1.72 A mgPt -1 ) and specific activity (3.49 mA cmPt -2 ), which are 11- and 15-fold that of commercial Pt/C, respectively. Besides, owing to the confinement effect of a-NPC and protection of Pt-skins, L12 -Pt3 Co@ML-Pt/NPC10 retains 98.1% mass activity after 30 000 cycles, and even 95% for 100 000 cycles, while Pt/C retains only 51.2% for 30 000 cycles. Rationalized by density functional theory, compared with other metals (Cr, Mn, Fe, and Zn), L12 -Pt3 Co closer to the top of "volcano" induces a more suitable compressive strain and electronic structure on Pt-skin, leading to an optimal oxygen adsorption energy and a remarkable ORR performance
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|a Journal Article
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|a compressive strains
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|a confinement effects
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|a fuel cells
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|a intermetallics
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|a oxygen reduction reaction
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|a Chen, Suhao
|e verfasserin
|4 aut
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1 |
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|a Wu, Wei
|e verfasserin
|4 aut
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1 |
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|a Chen, Runzhe
|e verfasserin
|4 aut
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|a Zhu, Yu
|e verfasserin
|4 aut
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|a Jiang, Haoran
|e verfasserin
|4 aut
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|a Yu, Liyue
|e verfasserin
|4 aut
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| 700 |
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|a Cheng, Niancai
|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 35(2023), 36 vom: 30. Sept., Seite e2301310
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
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|g volume:35
|g year:2023
|g number:36
|g day:30
|g month:09
|g pages:e2301310
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|u http://dx.doi.org/10.1002/adma.202301310
|3 Volltext
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