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Poisoning and regeneration of Pd catalyst in direct formic acid fuel cell |
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| Authors: | Yi Zhou Jilei Ye Jinhua Ye Jun Gu Aidong Yang |
| Affiliation: | a Eco-materials and Renewable Energy Research Center, Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China b Department of Materials Science and Engineering, Nanjing University Nanjing 210093, China c Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, GU2 7XH, UK |
| Abstract: | Palladium catalyst poisoned in the anode of direct formic acid fuel cell (DFAFC) during constant current discharging can be fully regenerated by a non-electrochemical method, i.e. just switching pure water to DFAFC for 1 h. Electrochemical impedance spectrum of DFAFC during the discharging and regeneration were recorded and analyzed. No much difference could be found for the high-frequency resistance of DFAFC after discharging while the charge transfer resistance in the mediate-frequency region increased significantly. The voltage variation during the regeneration showed that one platform of 0.35 V was formed by the intermediate species of formic acid oxidation, which is proven to be critical for cell performance regeneration. The results indicated that the absorption of poisoning species on Pd was the main reason for the decaying of cell performance. |
| Keywords: | Direct formic acid fuel cell Performance degradation Pd poisoning Performance regeneration Electrochemical impedance spectrum |
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