Projects per year
Abstract
The general requirements for PEM fuel cell catalyst
support materials are high electronic conductivity, high
specific surface area and high electrochemical and
chemical stability. Current structures typically consist
of Pt particles on carbon black support material, but the
mass activity of these high surface area nanoparticulate
catalysts as well as stability of carbon support is
limited. In this study we prepare corrosion resistant and
electrically conductive catalyst support structures
utilizing electrospinning and ALD.
New approach for automotive PEM fuel cell catalysts were
being developed in project Catapult. In this new approach
platinum was deposited as an extremely thin layer on
corrosion resistant supports of various morphologies
including fibrous structures. VTT's developed a
core-shell carbon-ceramic sub-µm fibrous catalyst
supports utilizing atomic layer deposition (ALD) method
on carbonized electrospun sub-µm fibres. Protective
Ti-Nb-oxide layer, also acting as wetting tie-layer for
platinum deposition, was applied by ALD method, and when
annealed, carbon-ceramic supports showed similar
conductivity than carbon fibre sheets prior to ALD
coating. Carbon fibres without oxide layer showed better
stability than carbon black reference, and oxide layer
improved the stability: Core-shell fibres with 100 or
more cycles of protective oxide layer showed similar
stability than oxide itself.
Original language | English |
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Publication status | Published - 2017 |
Event | Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop - San Sebastian, Spain Duration: 23 Jan 2017 → 25 Jan 2017 |
Workshop
Workshop | Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop |
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Country/Territory | Spain |
City | San Sebastian |
Period | 23/01/17 → 25/01/17 |
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Dive into the research topics of 'Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition'. Together they form a unique fingerprint.Projects
- 1 Finished
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CATAPULT: novel CATAlyst structures employing Pt at Ultra Low and zero loadings for auTomotive MEAs
Heikkilä, P. (Manager)
1/06/13 → 31/05/16
Project: EU project