| Electrode | Deposition time (s) | Electrode potential (V vs. Ag/AgCl) |
| Al/glass | - | -0.70 |
| ZnO/Al/glass | 3 | -0.55 |
| 17 | -0.46 | |
| NbOx/Al/glass | 10 | -0.19 |
| 15 | -0.25 | |
| 17 | -0.19 | |
| 20 | -0.07 | |
| 30 | -0.04 | |
| 40 | 0.00 | |
| 60 | 0.07 | |
| 100 | 0.11 | |
| 150 | 0.19 | |
| 200 | 0.20 | |
| 300 | 0.23 |