Table 1. Surface Pretreatments of 3 Groups of Electrodes Where R, O, and OR Prefixes Designate Electrodes That Were Tested at Reductive, Oxidative, or Oxidative Then Reductive Potentials, Respectively.
| name | oxidation voltage (V vs Ag/AgCl sat. KCl) | reduction voltage (V vs Ag/AgCl sat. KCl) |
|---|---|---|
| R2.5 | − | –2.5 |
| R1.5 | − | –1.5 |
| R0.5 | − | –0.5 |
| O1.5 | 1.5 | − |
| O2.5 | 2.5 | − |
| O3.5 | 3.5 | − |
| OR1.5 | 1.5 | –1.5 |
| OR2.5 | 2.5 | –1.5 |
| OR3.5 | 3.5 | –1.5 |
| controla | − | − |
a
The Control electrode was left at open-circuit voltage in 0.12 M Ti(SO4)2, which was measured to be 0.5 V vs. Ag/AgCl sat. KCl.