Migration and Precipitation of Platinum in Anion‐Exchange Membrane Fuel Cells
[1];
[1];
- Department of Materials Science and Chemical Engineering State University of New York at Stony Brook Stony Brook NY 11794 USA
- Department of Materials Science and Chemical Engineering State University of New York at Stony Brook Stony Brook NY 11794 USA, Mitsubishi Chemical Corporation Science &, Innovation Center 1000, Kamoshida-cho Aoba-ku Yokohama 227–8502 Japan
- Department of Materials Science and Chemical Engineering State University of New York at Stony Brook Stony Brook NY 11794 USA, Division of Chemistry Brookhaven National Laboratory Upton NY 11973 USA
- Department of Chemistry and Chemical Biology Rensselaer Polytechnic Institute Troy NY 12180 USA
- The Wolfson Department of Chemical Engineering Technion—Israel Institute of Technology Haifa 3200003 (Israel)
- Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia
- Center for Clean Energy Engineering University of Connecticut Storrs CT 06269 USA
- The Wolfson Department of Chemical Engineering Technion—Israel Institute of Technology Haifa 3200003 (Israel), The Nancy &, Stephen Grand Technion Energy Program (GTEP) Technion—Israel Institute of Technology Haifa 3200003 Israel
Abstract Despite the recent progress in increasing the power generation of Anion‐exchange membrane fuel cells (AEMFCs), their durability is still far lower than that of Proton exchange membrane fuel cells (PEMFCs). Using the complementary techniques of X‐ray micro‐computed tomography (CT), Scanning Electron Microscopy (SEM) and Energy Dispersive X‐ray (EDX) spectroscopy, we have identified Pt ion migration as an important factor to explain the decay in performance of AEMFCs. In alkaline media Pt +2 ions are easily formed which then either undergo dissolution into the carbon support or migrate to the membrane. In contrast to PEMFCs, where hydrogen cross over reduces the ions forming a vertical “Pt line” within the membrane, the ions in the AEM are trapped by charged groups within the membrane, leading to disintegration of the membrane and failure. Diffusion of the metal components is still observed when the Pt/C of the cathode is substituted with a FeCo−N−C catalyst, but in this case the Fe and Co ions are not trapped within the membrane, but rather migrate into the anode, thereby increasing the stability of the membrane.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0022199
- OSTI ID:
- 1998011
- Journal Information:
- Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 37 Vol. 135; ISSN 0044-8249
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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