Degradation studies of PEMFC cathodes based on different types of carbon
2009 (English)In: ECS Transactions, 2009, Vol. 25, no 1 PART 2, 1241-1250 p.Conference paper (Refereed)
In this study different accelerated degradation tests were used evaluating three different carbon supports as well as a thin model electrode. Cyclic ADTs, by 1000 cycles beween 0.6 and 1.2 V in nitrogen, did not degrade the porous electrodes to any larger extent in terms of oxygen reduction activity, whereas a significant loss of electrochemical surface area was seen, often more than 50%. Potentiostatic hold at 1.4 V during 3 h, did not permanently degrade the electrodes but instead an improved activity was obtained after rest during night. A correlation of increase in double layer capacitance and improved performance was seen and believed to be caused by the good proton conductivity of carbon surface oxides. CO-stripping peaks revealed that the humidity and wetting of Nafionâ¢ may have caused the observed temporary changes during the potentiostatic hold. Â©The Electrochemical Society.
Place, publisher, year, edition, pages
2009. Vol. 25, no 1 PART 2, 1241-1250 p.
Accelerated degradation tests, Carbon support, Carbon surface oxides, Degradation study, Double-layer capacitance, Electrochemical surface area, Oxygen Reduction, PEMFC cathode, Porous electrodes, Potentiostatics, Degradation, Electrolytic reduction, Membranes, Oxygen, Proton exchange membrane fuel cells (PEMFC), Protons, Stripping (dyes), Electrochemical electrodes
IdentifiersURN: urn:nbn:se:kth:diva-25234DOI: 10.1149/1.3210679ISI: 000329585500126ScopusID: 2-s2.0-77649265443ISBN: 978-156677738-4OAI: oai:DiVA.org:kth-25234DiVA: diva2:356649
9th Proton Exchange Membrane Fuel Cell Symposium (PEMFC 9) - 216th Meeting of the Electrochemical Society; Vienna; 4 October 2009 through 9 October 2009
QC 201010142010-10-132010-10-132014-10-06Bibliographically approved