Figure 7
3D-simulations with parameters from Table 1. (a) Variation of the size of the bottom electrode (BE). The size of the top electrode (TE) is kept constant, while the diameter of the BE and the oxide layer vary in size. The circles indicate the location of the intersection point. Note that the green curve (\({\text {BE}}=2.50\times 10^{-13}\,{\text {m}}^2\)) is completely covered by the yellow curve. (b) Contour plot of the electrochemical potential of the oxygen ions at the maximum voltage of 0.02 V after the first quarter of a steady cycle. Shown is the cross section across the centre of the device. The electrodes are shown in grey with the TE being much smaller than the BE, corresponding to the yellow curve with a BE-area of \(1.00\times 10^{-12}\,\mathrm {m}^2\) in (a). (c) y-component of the gradient of the electrochemical potential of the oxygen ions in (b) at the BE (\(y=0\)).
