Enhanced Stability of PtRu Supported on N-Doped Carbon for the Anode of a DMFC
NATIONAL RENEWABLE ENERGY LAB GOLDEN CO
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The performance and long-term stability of a direct-methanol fuel cell DMFC employing PtRu supported on nitrogen-modified carbon is compared with that of PtRuC Hi-spec 5000. The long-term stability test is carried by means of accelerated degradation testing ADT at an anodic potential of 0.8 V vs. DHE for 640h. The initial DMFC performance of the MEA containing PtRuC N-doped is slightly lower than that of the PtRuC Hi-SPEC because of the lower ECSA of the former. After 640h ADT, the anode ECSA loss is found to be 21 and 26 for the PtRuC N-doped and PtRuC Hi-SPEC, respectively. Electrochemical analyzes reveal that cathode of the MEA with PtRuC N-doped is less contaminated with Ru. It is further corroborated by post-mortem analysis done by scanning electron microscopy SEM associated with EDS, which indicates 4.8 and 8.2 at. Ru accumulation, respectively, in the cathodes of the PtRuC N-doped and PtRuC Hi-SPEC MEAs after 640h ADT. Although both MEAs sustain anode and cathode ECSA losses, the performance for the PtRuC N-doped MEA is improved by 28 and 8 after initial and long-term ADT, while the performance for the PtRuC Hi-SPEC MEA is improved by 20 after initial and decreased by 3 after long-term ADT.
- Inorganic Chemistry
- Electrical and Electronic Equipment
- Electrochemical Energy Storage
- Properties of Metals and Alloys