An electrode comprised of a carbon dioxide/carbon monoxide mixture bubbled over platinum immersed in molten sodium carbonate within a closed-end sheath of commercialpurity alumina was found to be ohmic, with an apparent sheath resistivity of the order of 1 M ohm cm at 1000°C, and to respond in a Nernstian manner to variation in the P qq and Pc02 values* This electrode permits independent control of cell and reference environments and, by vir tue of cationic transport within the alumina sheath,

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... s insensitive to anionic electrolyte variations. Electrode polarization data for Ni 200 in molten sodium carbonate under reducing environments are reported; these data are matched to an empirical function via computer modelling.