TY - JOUR

T1 - Three-dimensional shapes and spatial distributions of Pt and PtCr catalyst nanoparticles on carbon black

A1 - Gontard,Lionel Cervera

A1 - Dunin-Borkowski,Rafal E.

A1 - Ozkaya,D.

AU - Gontard,Lionel Cervera

AU - Dunin-Borkowski,Rafal E.

AU - Ozkaya,D.

PB - Wiley-Blackwell Publishing Ltd.

PY - 2008

Y1 - 2008

N2 - High-angle annular dark-field scanning transmission electron microscopy tomography is applied to the study of Pt and PtCr nanoparticles supported on carbon black, which are used as heterogeneous catalysts in the electrodes of proton exchange membrane fuel cells. By using electron tomography, the three-dimensional architecture of the heterogeneous catalyst system can be determined, providing high-spatial-resolution information about the shapes, faceting and crystallographies of 5-20 nm single and multiply twinned catalyst particles, as well as their positions with respect to the carbon support. Approaches that can be used to provide improved information about the distribution and orientation of the particles on their support are proposed and discussed. Our results show that electron tomography provides important information that is complementary to high-resolution lattice imaging. Both techniques are required to understand fully the nature and role of the surfaces of faceted catalyst particles.

AB - High-angle annular dark-field scanning transmission electron microscopy tomography is applied to the study of Pt and PtCr nanoparticles supported on carbon black, which are used as heterogeneous catalysts in the electrodes of proton exchange membrane fuel cells. By using electron tomography, the three-dimensional architecture of the heterogeneous catalyst system can be determined, providing high-spatial-resolution information about the shapes, faceting and crystallographies of 5-20 nm single and multiply twinned catalyst particles, as well as their positions with respect to the carbon support. Approaches that can be used to provide improved information about the distribution and orientation of the particles on their support are proposed and discussed. Our results show that electron tomography provides important information that is complementary to high-resolution lattice imaging. Both techniques are required to understand fully the nature and role of the surfaces of faceted catalyst particles.

KW - tomography

KW - platinum alloy

KW - nanoparticle shapes

KW - platinum

KW - Heterogeneous catalysts

KW - nanoparticles

U2 - 10.1111/j.1365-2818.2008.02096.x

DO - 10.1111/j.1365-2818.2008.02096.x

JO - Journal of Microscopy

JF - Journal of Microscopy

SN - 0022-2720

IS - 2

VL - 232

SP - 248

EP - 259

ER -