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 is restrainer for a large-scale
commercialization of PEM fuel cell for vehicles.
Reduction of platinum content per vehicle and increase of
mass activity are solutions paving the way for a larger
utilization of the PEM fuel cells.
New approach for automotive PEM fuel cell catalysts are
being developed in project CATAPULT (novel CATAlyst
structures employing Pt at Ultra Low and zero loadings
for auTomotive MEAs; Funded by EC FP7, Fuel Cells and
Hydrogen Joint Technology Initiative, grant agreement
n°.325268). In this new approach platinum is deposited as
an extremely thin layer on corrosion resistant supports
of various morphologies including fibrous and tubular
structures. VTT's approach is to produce two types of
structures: core-shell carbon-ceramic sub-µm fibrous and
ceramic sub-µm tubular catalyst supports utilizing atomic
layer deposition (ALD) method on electrospun sub-µm
fibres. Within this presentation we will present results
of Nb-Ti-oxide coatings made, firstly, on carbonized
sub-µm fibres in order to obtain core shell fibrous
supports and, secondly, on sacrificial polymeric fibres
in order to make tubular supports for platinum coating
also made by ALD method. Support production and the
properties of the support materials are presented, and
deposition of Pt catalyst layer is discussed in this
presentation.
Original language | English |
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Publication status | Published - 2014 |
Event | 28th International Conference on Surface Modification Technologies, SMT28 - Tampere, Finland Duration: 16 Jun 2014 → 18 Jun 2014 |
Conference
Conference | 28th International Conference on Surface Modification Technologies, SMT28 |
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Country/Territory | Finland |
City | Tampere |
Period | 16/06/14 → 18/06/14 |
Keywords
- atomic layer deposition
- core-shell fibres
- electrospinning
- fuel cell
- catalyst