Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition

Research output: Contribution to conferenceConference articleScientific

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 languageEnglish
Publication statusPublished - 2017
EventWorkshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop - San Sebastian, Spain
Duration: 23 Jan 201725 Jan 2017

Workshop

WorkshopWorkshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop
CountrySpain
CitySan Sebastian
Period23/01/1725/01/17

Fingerprint

Atomic layer deposition
Electrospinning
Oxides
Carbon
Catalyst supports
Fibers
Soot
Platinum
Fuel cells
Corrosion
Automotive fuels
Catalysts
Chemical stability
Specific surface area
Wetting
Coatings
carbon fiber

Cite this

Heikkilä, P., Pasanen, A., Putkonen, M., & Vähä-Nissi, M. (2017). Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition. Paper presented at Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop, San Sebastian, Spain.
Heikkilä, Pirjo ; Pasanen, Antti ; Putkonen, Matti ; Vähä-Nissi, Mika. / Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition. Paper presented at Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop, San Sebastian, Spain.
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title = "Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition",
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.",
author = "Pirjo Heikkil{\"a} and Antti Pasanen and Matti Putkonen and Mika V{\"a}h{\"a}-Nissi",
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Heikkilä, P, Pasanen, A, Putkonen, M & Vähä-Nissi, M 2017, 'Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition' Paper presented at Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop, San Sebastian, Spain, 23/01/17 - 25/01/17, .

Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition. / Heikkilä, Pirjo; Pasanen, Antti; Putkonen, Matti; Vähä-Nissi, Mika.

2017. Paper presented at Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop, San Sebastian, Spain.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition

AU - Heikkilä, Pirjo

AU - Pasanen, Antti

AU - Putkonen, Matti

AU - Vähä-Nissi, Mika

N1 - Project code: 100646

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

M3 - Conference article

ER -

Heikkilä P, Pasanen A, Putkonen M, Vähä-Nissi M. Core-shell carbon-ceramic hybrid fibres by electrospinning and atomic layer deposition. 2017. Paper presented at Workshop on hybrid materials by ALD/MLD & IBERIAN ALD workshop, San Sebastian, Spain.