The 1 8 O/ 1 6 O Isotope Exchange Depth Profile technique (IEDP) was applied to BIMEVOX.10 (ME=Cu, Co) materials to determine their oxygen exchange coefficients and bulk oxygen tracer diffusion coefficients. These results are compared to the exchange current densities obtained from current-voltage curves and bulk conductivity determined by impedance spectroscopy. These results confirm that, in spite of a noticeably higher ionic conductivity than that of the classical oxide electrolytes such as yttria stabilized zirconia (YSZ) or gadolinia-doped ceria (GDC), the oxygen surface exchange coefficients are low.