Palladium–platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction

Wang, Xue; Choi, Sang-Il; Roling, Luke T.; Luo, Ming; Ma, Cheng; Zhang, Lei; Chi, Miaofang; Liu, Jingyue; Xie, Zhaoxiong; Herron, Jeffrey A.; Mavrikakis, Manos; Xia, Younan

doi:10.1038/ncomms8594

Title: Palladium–platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction

Journal Article · Thu Jul 02 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms8594· OSTI ID:1259678

Wang, Xue ^[1]; Choi, Sang-Il ^[2]; Roling, Luke T. ^[3]; Luo, Ming ^[2]; Ma, Cheng ^[4]; Zhang, Lei ^[1]; Chi, Miaofang ^[4]; Liu, Jingyue ^[5]; Xie, Zhaoxiong ^[6]; Herron, Jeffrey A. ^[3]; Mavrikakis, Manos ^[3]; Xia, Younan ^[2]

Georgia Institute of Technology and Emory University, Atlanta, GA (United States); Xiamen Univ., Xiamen (China)
Georgia Institute of Technology and Emory University, Atlanta, GA (United States)
University of Wisconsin-Madison, Madison, WI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Arizona State Univ., Tempe, AZ (United States)
Xiamen Univ., Xiamen (China)

Conformal deposition of platinum as ultrathin shells on facet-controlled palladium nanocrystals offers a great opportunity to enhance the catalytic performance while reducing its loading. Here we report such a system based on palladium icosahedra. Owing to lateral confinement imposed by twin boundaries and thus vertical relaxation only, the platinum overlayers evolve into a corrugated structure under compressive strain. For the core-shell nanocrystals with an average of 2.7 platinum overlayers, their specific and platinum mass activities towards oxygen reduction are enhanced by eight- and sevenfold, respectively, relative to a commercial catalyst. Density functional theory calculations indicate that the enhancement can be attributed to the weakened binding of hydroxyl to the compressed platinum surface supported on palladium. After 10,000 testing cycles, the mass activity of the core-shell nanocrystals is still four times higher than the commercial catalyst. These results demonstrate an effective approach to the development of electrocatalysts with greatly enhanced activity and durability.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER15731; AC02-06CH11357; AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1259678

Alternate ID(s):: OSTI ID: 1337045; OSTI ID: 1395953

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 402 works

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