Abstract
Porous silver membranes were investigated as potential substrates for alkaline fuel cell gas transport electrodes by both electrochemical half-cell measurements in aqueous KOH electrolyte and production of fuel cells utilising an anion-exchange polymer electrolyte. The silver membranes provide both electrocatalytic function, mechanical support and a means of current collection. The gas transport layers are cost effective compared to current gas transport media (∼3× more expensive) especially considering their greatly reduced thickness, and several hundred-fold superior electrical and thermal conductivity. Utilising Teflon-AF as a hydrophobisation agent allows production of very high performance cathodes, with platinum-free performance under oxygen at 25°C of 248mAcm−2 (0.70V vs. RHE) and 575mAcm−2 (0.60V vs. RHE). Addition of a small amount of platinum (100μgcm−2) increases the cathode performance to 1071mAcm−2, and 1756mAcm−2, respectively. An alkaline anion exchange membrane fuel cells constructed utilising these electrodes and an anion-exchange polymer electrolyte shows an open circuit potential of 1.05V and a performance of 100mAcm−2 at 0.6V (60mWcm−2).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
