Graphitised Carbon Nanofibres as Catalyst Support for PEMFC
2011 (English)In: Fuel Cells, ISSN 1615-6846, E-ISSN 1615-6854, Vol. 11, no 6, 715-725 p.Article in journal (Refereed) Published
Graphitised carbon nanofibres (G-CNFs) show superior thermal stability and corrosion resistance in PEM fuel cell environment over traditional carbon black (CB) and carbon nanotube catalyst supports. However, G-CNFs have an inert surface with only very limited amount of surface defects for the anchorage of Pt catalyst nanoparticles. Modification of the fibre surface is therefore needed. In this study Pt nanoparticles have been deposited onto as-received and surface-modified G-CNFs. The surface modifications of the fibres comprise acid treatment and nitrogen doping by pyrolysis of a polyaniline (PANI) precursor. The modified surfaces were studied by FTIR and XPS and the electrochemical characterization, including long-term Pt stability tests, was performed using a low-temperature PEMFC single cell. The performance and stability of the G-CNF supported catalysts were compared with a CB supported catalyst and the effects of the different surface treatments were discussed. On the basis of these results, new membrane electrode assemblies (MEAs) were manufactured and tested also for carbon corrosion by in situ FTIR analysis of the cathode exhaust gases. It was observed that the G-CNFs showed 5?times lower carbon corrosion compared to CB based catalyst when potential reached 1.5?V versus RHE in simulated start/stop cycling.
Place, publisher, year, edition, pages
Wiley-Blackwell, 2011. Vol. 11, no 6, 715-725 p.
Carbon Corrosion, Carbon Nanofibres, Catalyst Stability, Catalyst Support, Proton Exchange Membrane Fuel Cell, Surface Modification
Other Chemistry Topics
IdentifiersURN: urn:nbn:se:kth:diva-70040DOI: 10.1002/fuce.201000180ISI: 000298317200002ScopusID: 2-s2.0-84055212712OAI: oai:DiVA.org:kth-70040DiVA: diva2:485977
QC 201201302012-01-302012-01-302015-06-24Bibliographically approved