Morphing Mn<sub>core</sub>@Pt<sub>shell</sub> nanoparticles [electronic resource] : Effects of core structure on the ORR performance of Pt shell.
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Argonne, Ill. : Oak Ridge, Tenn. :
Argonne National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
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| Abstract: | Currently, the catalysts performance for the oxygen reduction reaction (ORR) is limited by two major factors, their price and the scaling relationship, i.e. constant offset, between the binding energy of reactants and reaction intermediates. Here we show that both limitations may be eased by using nanoparticle catalysts composed of a core of earth-abundant Mn and Pt shell of two atomic layers. We report the unusual atomic-structure of Mn core renders the distribution of coordination numbers and related atomic-level stresses on the Pt shell very broad in com- parison to pure Pt particles. This increases the chances of nearby sites on the shell to affect each other?s activity such that the dissociative absorption of molecular oxygen is facilitated without correspondingly increasing the binding strength of reaction intermediates, thereby promoting the ORR kinetics. Our findings introduce the concept of structural flexibility of the 3d-metal core and 5d-Pt shell as a strategy for catalysis performance. |
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| Item Description: | Published through Scitech Connect. 02/04/2020. "Journal ID: ISSN 0926-3373." "Other: 148225." Matin, Md. Abdul ; Lee, Junsu ; Kim, Gwan Woo ; Park, Hyun-Uk ; Cha, Byeong Jun ; Shastri, Sarvjit ; Kim, Gunn ; Kim, Young-Dok ; Kwon, Young-Uk ; Petkov, Valeri ; et al. National Research Foundation of Korea (NRF) |
| Physical Description: | Size: Article No. 118727 : digital, PDF file. |