Photoelectrochemical Stability and Alteration Products of n-Type Single-Crystal ZnO Photoanodes

Figure 1

Current density versus applied potential curves for ZnO single-crystal electrode sample no. 4 (see Table 1) in the dark (solid line) and under illumination (dotted line). Regions A and B are reverse biased, showing photocurrent (B) under illumination or no current (A) in the dark. Position C is flat band, D is the cathodic peak, and F is the anodic peak. Bubbles formed at the electrode in region E. The arrows are used to emphasize the direction of the cyclic potential sweep.