ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Conclusion Based on the preceding discussion, it is tentatively concluded that the oxide electrolyte cell acts as an oxygen concentration cell and the presence of point defects, such as interstitial protons on the oxide electrolyte surface, enhances the electrochemical reduction of O2 at the cathode and may be responsible for catalysing the anodic oxidation of H2. In order to obtain a much better understanding of the fundamentals of electrode processes involving point defects like interstitial protons and F-centres (V 0 x ), it is necessary to investigate the current-overpotential characteristics by performing systematic experiments using various metals as electrodes and a variety of oxides (e.g. ceria) over a wide range of compositions as electrolytes. It is planned to examine the influence of the morphology of the surface on the current-overpotential characteristics by making electron-microscopic, and Auger spectroscopic, measurements. In future work, the magnitude of the individual cathodic and anodic overpotentials will be measured by the introduction of reference electrodes to the system. Having reference electrodes available will greatly facilitate the interpretation of the data and confirmation of proposed electrochemical mechanisms. Also, with the experimental arrangement of Fig. 1 variation of flow-rates normal to the disc, resulting in stagnation flows, will allow gas phase masstransfer rates to be varied, thus allowing the mechanism of the limiting current behaviour in the plateaus of Figs. 3 and 4 to be ascertained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00615398
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