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Pt–Co@Pt Octahedral Nanocrystals: Enhancing Their Activity and Durability toward Oxygen Reduction with an Intermetallic Core and an Ultrathin Shell

Minghao XieSchool of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesZhiheng LyuSchool of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesRuhui ChenSchool of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United StatesMin ShenThe Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United StatesZhenming CaoThe Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United StatesYounan XiaSchool of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States

2021en

ABI

Annotatsiya

Despite extensive efforts devoted to the synthesis of Pt–Co bimetallic nanocrystals for fuel cell and related applications, it remains a challenge to simultaneously control atomic arrangements in the bulk and on the surface. Here we report a synthesis of Pt–Co@Pt octahedral nanocrystals that feature an intermetallic, face-centered tetragonal Pt–Co core and an ultrathin Pt shell, together with the dominance of {111} facets on the surface. When evaluated as a catalyst toward the oxygen reduction reaction (ORR), the nanocrystals delivered a mass activity of 2.82 A mg–1 and a specific activity of 9.16 mA cm–2, which were enhanced by 13.4 and 29.5 times, respectively, relative to the values of a commercial Pt/C catalyst. More significantly, the mass activity of the nanocrystals only dropped 21% after undergoing 30 000 cycles of accelerated durability test, promising an outstanding catalyst with optimal performance for ORR and related reactions.

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Identifikatorlar

DOI: 10.1021/jacs.1c04160

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