Figure 3: Oxygen ionic conductivity study on isostructural single-doped or co-doped SrCoO3−δ perovskites.
From: A niobium and tantalum co-doped perovskite cathode for solid oxide fuel cells operating below 500 °C
(a) Estimated ionic conductivities of SCN20, SCT20 and SCNT membranes with similar dimensions determined by oxygen permeability testing. The values in the figure are average of multiple data values, and the vertical error bars are estimated from s.d. in the mean. (b) A schematic of the minimum energy migration pathway for an oxygen vacancy (VO) in SrCo0.75Nb0.125Ta0.125O3−δ, where dopants shown by coloured balls and Co along the pathway are within the octohedra. Other Co and Sr ions are omitted for clarity. The numbers 1–5 indicate the sequential positions of an oxygen vacancy along the diffusion pathway.
