Atomic structure and composition of "pt3Co" nanocatalysts in fuel cells: An aberration-corrected STEM HAADF study

Brian Patrick; Hyung Chul Ham; Yang Shao-Horn; Lawrence F. Allard; Gyeong S. Hwang; Paulo J. Ferreira

doi:10.1021/cm3029164

Atomic structure and composition of "pt₃Co" nanocatalysts in fuel cells: An aberration-corrected STEM HAADF study

Brian Patrick, Hyung Chul Ham, Yang Shao-Horn, Lawrence F. Allard, Gyeong S. Hwang, Paulo J. Ferreira

Department of Chemical Engineering & Materials Science

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Pt₃Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt₃Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed.

Original language	English
Pages (from-to)	530-535
Number of pages	6
Journal	Chemistry of Materials
Volume	25
Issue number	4
DOIs	https://doi.org/10.1021/cm3029164
State	Published - 26 Feb 2013

Keywords

PEM fuel cells
aberration-corrected STEM
nanoparticles
platinum-alloyed catalysts

Access to Document

10.1021/cm3029164

Cite this

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title = "Atomic structure and composition of {"}pt3Co{"} nanocatalysts in fuel cells: An aberration-corrected STEM HAADF study",

abstract = "Pt3Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt3Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed.",

keywords = "PEM fuel cells, aberration-corrected STEM, nanoparticles, platinum-alloyed catalysts",

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T2 - An aberration-corrected STEM HAADF study

AU - Patrick, Brian

AU - Ham, Hyung Chul

AU - Shao-Horn, Yang

AU - Allard, Lawrence F.

AU - Hwang, Gyeong S.

AU - Ferreira, Paulo J.

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AB - Pt3Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt3Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed.

KW - PEM fuel cells

KW - aberration-corrected STEM

KW - nanoparticles

KW - platinum-alloyed catalysts

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