Catalytic Reactions in Direct Ethanol Fuel Cells

Catalytic Reactions in Direct Ethanol Fuel Cells
직접에탄올연료전지; 백금촉매; 핵자기공명; 에탄올산화반응; electrochemistry; ethanol oxidation; fuel cells; NMR spectroscopy; reaction mechanisms
Issue Date
Angewandte Chemie international edition
VOL 50, NO 10, 2270-2274
In summary, the dependence of product populations on potential, measured by NMR spectroscopy, is clearly different on each catalyst, especially for AA. The increased current of the DEFCs that were prepared with the Pt3Sn/C or PtRu/C anode catalyst was mainly due to enhanced production of AA, which was the greatest for Pt3Sn/C. ED is a major product detected by NMR spectroscopy in addition to the previously reported major products AA and AAL. With the maximum AA population for Pt3Sn/C or PtRu/C, the potentials were consistent with the onset potentials of COstripping and ethanol-oxidation voltammetry. The different dependences on potential for AA and ED production suggest that the water dissociation reaction was not the only major controlling factor for the AA and ED production, and AAL and ED behave as intermediates to be converted into AA. All products that were identified in the liquid exhaust by NMR spectroscopy in this study and previous reports on ethanol oxidation led to the proposed ethanol reaction pathways. The NMR experiments demonstrated here can be carried out in a much shorter time with probes that are equipped with smaller NMR coils[21] and better sensitivities. The NMR analyses can be performed on-line and automated if the fuel cell is adapted to an LC-NMR-type spectrometer.[22] In terms of hardware, integrating the NMR analyses with other on-line analyses such as differential electrochemical mass spectrometry (DEMS) and in situ FTIR of the reaction products in an operating fuel cell could be highly desirable to improve investigation of the fuel-cell reaction mechanism.
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