Spatial distribution of reaction products in direct ethanol fuel cell |
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Authors: | Younkee Paik Seong-Soo Kim Oc Hee Han |
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Affiliation: | Analysis Research Division, Daegu Center, Korea Basic Science Institute, 67 Kyungdae Jungmoonro, Pookgu, Daegu 702-701, Republic of Korea |
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Abstract: | The electro-catalytic oxidation of ethanol in a direct-type polymer electrolyte membrane fuel cell is known to be more complex than that of methanol. We used both solution and solid-state nuclear magnetic resonance (NMR) methods for the first time to successfully identify and quantify the reaction intermediates and the fuel itself which were distributed differently over fuel pathways and the polymer membrane (PEM) in the direct ethanol fuel cell (DEFC). The diverse chemical species present in the exhaust were identified by high-resolution solution NMR, while the nature and amounts of the species in the PEM of the DEFC were analyzed by solid-state NMR. The relative amount of reaction intermediates of ethanol detected in the PEM was an order of magnitude higher than that observed in the exhaust, which might be of critical importance in understanding and developing DEFC systems. |
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