Abstract
Heterogeneous solid electrochemical cells that contain two mixed ionic-electronic conductors (MIECs) exhibit quite unexpected I-V relations when the two MIECs conduct ionic defects having different absolute values of their effective charge | z|. For example, the larger voltage drop need not occur on the MIEC with the larger resistance to electronic (electron/hole) current. When the ionic transference number of one of the two MIECs is close to unity and its resistance to electronic current is large enough, then a simple relation is imposed on the ionic and electronic currents in the other MIEC. This is an ambipolar motion of ionic and electronic charge carriers with a non zero total current. The effect on the I-V relations of adding a solid electrolyte in series with a MIEC, conducting defects with different | z |, is discussed in detail, including the implications on ionic conductivity measurements.
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