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Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction

TitleSub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction
Publication TypeJournal Article
Year of Publication2017
AuthorsQi, ZY, Xiao, CX, Liu, C, Goh, TW, Zhou, L, Maligal-Ganesh, R, Pei, YC, Li, XL, Curtiss, LA, Huang, WK
JournalJournal of the American Chemical Society
Volume139
Pagination4762-4768
Date Published04
Type of ArticleArticle
ISBN Number0002-7863
Accession NumberWOS:000398764000028
Keywordsactivity, alloy, chemistry, electrocatalytic, formic-acid, fuel-cell catalysts, methanol oxidation reaction, nanocrystals, nanocubes, oxygen reduction, phases, strategy
Abstract

pathway for MOR because of the stabilization of the OH* intermediate by Zn atoms, while a pure Pt system forms highly stable COH* and CO* intermediates, leading to catalyst deactivation. Experimental studies on the origin of the backward oxidation peak of MOR coincide well with DFT predictions. Moreover, the calculations demonstrate that MOR on smaller PtZn iNPs is energetically more favorable than larger iNPs, due to their high density of corner sites and lower-lying energetic pathway. Therefore, smaller PtZn iNPs not only increase the number but also enhance the activity of the active sites in MOR compared with larger ones. This work opens a new avenue for the synthesis of small iNPs with more undercoordinated and enhanced active sites for fuel cell applications.

DOI10.1021/jacs.6b12780
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Alternate JournalJ. Am. Chem. Soc.