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Tuning Surface Structure of Pd3Pb/Pt n Pb Nanocrystals for Boosting the Methanol Oxidation Reaction.


ABSTRACT: Developing an efficient Pt-based electrocatalyst with well-defined structures for the methanol oxidation reaction (MOR) is critical, however, still remains a challenge. Here, a one-pot approach is reported for the synthesis of Pd3Pb/Pt n Pb nanocubes with tunable Pt composition varying from 3.50 to 2.37 and 2.07, serving as electrocatalysts toward MOR. Their MOR activities increase in a sequence of Pd3Pb/Pt3.50Pb << Pd3Pb/Pt2.07Pb < Pd3Pb/Pt2.37Pb, which are substantially higher than that of commercial Pt/C. Specifically, Pd3Pb/Pt2.37Pb electrocatalysts achieve the highest specific (13.68 mA cm-2) and mass (8.40 A mgPt -1) activities, which are ?8.8 and 6.8 times higher than those of commercial Pt/C, respectively. Structure characterizations show that Pd3Pb/Pt2.37Pb and Pd3Pb/Pt2.07Pb are dominated by hexagonal-structured PtPb intermetallic phase on the surface, while the surface of Pd3Pb/Pt3.50Pb is mainly composed of face-centered cubic (fcc)-structured Pt x Pb phase. As such, hexagonal-structured PtPb phase is much more active than the fcc-structured Pt x Pb one toward MOR. This demonstration is supported by density functional theory calculations, where the hexagonal-structured PtPb phase shows the lowest adsorption energy of CO. The decrease in CO adsorption energy and structural stability also endows Pd3Pb/Pt n Pb electrocatalysts with superior durability relative to commercial Pt/C.

SUBMITTER: Wu X 

PROVIDER: S-EPMC6918111 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Tuning Surface Structure of Pd<sub>3</sub>Pb/Pt <i><sub>n</sub></i> Pb Nanocrystals for Boosting the Methanol Oxidation Reaction.

Wu Xingqiao X   Jiang Yi Y   Yan Yucong Y   Li Xiao X   Luo Sai S   Huang Jingbo J   Li Junjie J   Shen Rong R   Yang Deren D   Zhang Hui H  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20191029 24


Developing an efficient Pt-based electrocatalyst with well-defined structures for the methanol oxidation reaction (MOR) is critical, however, still remains a challenge. Here, a one-pot approach is reported for the synthesis of Pd<sub>3</sub>Pb/Pt <i><sub>n</sub></i> Pb nanocubes with tunable Pt composition varying from 3.50 to 2.37 and 2.07, serving as electrocatalysts toward MOR. Their MOR activities increase in a sequence of Pd<sub>3</sub>Pb/Pt<sub>3.50</sub>Pb << Pd<sub>3</sub>Pb/Pt<sub>2.07<  ...[more]

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