Controlling Pt Crystal Defects on the Surface of Ni–Pt Core–Shell Nanoparticles for Active and Stable Electrocatalysts for Oxygen Reduction

Alinezhad, Ali; Benedetti, Tania M.; Gloag, Lucy; Cheong, Soshan; Watt, John Daniel; Chen, Hsiang-Sheng; Gooding, J. Justin; Tilley, Richard D.

doi:10.1021/acsanm.0c01159

Title: Controlling Pt Crystal Defects on the Surface of Ni–Pt Core–Shell Nanoparticles for Active and Stable Electrocatalysts for Oxygen Reduction

Journal Article · Thu May 21 00:00:00 EDT 2020 · ACS Applied Nano Materials

DOI:https://doi.org/10.1021/acsanm.0c01159· OSTI ID:1968215

Alinezhad, Ali ^[1]; Benedetti, Tania M. ^[1]; Gloag, Lucy ^[1];

^[1];

^[2]; Chen, Hsiang-Sheng ^[1];

^[1];

^[1]

Univ. of New South Wales, Sydney, NSW (Australia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A strategy of direct growth of Pt on Ni was used to create and control Pt crystal defects on the surface of Ni–Pt core–shell nanoparticles. The control over the types of defects was easily achieved by changing the surfactant system. Here, in this work, two types of crystal defects have been introduced into Ni–Pt core–shell nanoparticles: polycrystalline shells with multiple grain boundaries and step-edge shells with undercoordinated atoms at corners and steps. We show that the step-edge shell has a higher specific activity for the oxygen reduction reaction (ORR), while the thinner polycrystalline shell results in a higher activity per mass and stability. Our results suggest that Ni–Pt core–shell nanoparticles with a thin Pt shell that have high density of crystal defect should be targeted for high performance ORR catalysts.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); Australian Research Council of Centre of Excellence in Convergent Bio-Nano Science and Technology; ARC Australian Laureate Fellowship; Discovery Projects

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1968215

Report Number(s):: LA-UR-19-31960

Journal Information:: ACS Applied Nano Materials, Vol. 3, Issue 6; ISSN 2574-0970

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Controlling Pt Crystal Defects on the Surface of Ni–Pt Core–Shell Nanoparticles for Active and Stable Electrocatalysts for Oxygen Reduction

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