Linking morphology with activity through the lifetime of pretreated PtNi nanostructured thin film catalysts

The nanoscale morphology of highly active Pt 3 Ni 7 nanostructured thin film fuel cell catalysts is linked with catalyst surface area and activity following catalyst pretreatments, conditioning and potential cycling. The significant role of fuel cell conditioning on the structure and composition of...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2015-01, Vol.3 (21), p.11660-11667
Main Authors: Cullen, D. A., Lopez-Haro, M., Bayle-Guillemaud, P., Guetaz, L., Debe, M. K., Steinbach, A. J.
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
Catalysis
Catalysts
Conditioning
Cycles
Fuel cells
Morphology
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructure
Physics
Surface chemistry
Thin films
Tomography
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Summary:The nanoscale morphology of highly active Pt 3 Ni 7 nanostructured thin film fuel cell catalysts is linked with catalyst surface area and activity following catalyst pretreatments, conditioning and potential cycling. The significant role of fuel cell conditioning on the structure and composition of these extended surface catalysts is demonstrated by high resolution imaging, elemental mapping and tomography. The dissolution of Ni during fuel cell conditioning leads to highly complex, porous structures which were visualized in 3D by electron tomography. Quantification of the rendered surfaces following catalyst pretreatment, conditioning, and cycling shows the important role pore structure plays in surface area, activity, and durability.
ISSN:2050-7488
2050-7496
DOI:10.1039/C5TA01854D