Batch Experiments for the Determination of the Ti(IV,III) Couple Formal Potential in 1 mol⋅dm−3 HCl, 2 mol⋅dm−3 NaCl Medium at 25 °C

Charge Transfer Mechanism on a Cobalt-Polyoxometalate-TiO2 Photoanode for Water Oxidation in Acid

“…The effects of Co 9 POM and APS modification on the TiO 2 photoelectrode were evaluated in a series of photoelectrochemical (PEC) characterizations in a pH 2 sulfate buffer solution (details in the Experimental Section). Figure a shows that under the dark conditions, TiO 2 , TiO 2 –APS, and TiO 2 – Co 9 POM electrodes exhibit negligible current when scanned to positive potentials, though there is an oxidation peak at around 0.0 V vs reversible hydrogen electrode (RHE) that can be attributed to the Ti­(III)/Ti­(IV) redox couple . All potentials in this study are referenced to RHE unless otherwise mentioned.…”

“…Figure 2a shows that under the dark conditions, TiO 2 , TiO 2 − APS, and TiO 2 −Co 9 POM electrodes exhibit negligible current when scanned to positive potentials, though there is an oxidation peak at around 0.0 V vs reversible hydrogen electrode (RHE) that can be attributed to the Ti(III)/Ti(IV) redox couple. 59 All potentials in this study are referenced to RHE unless otherwise mentioned. With 365 nm light illumination, the photocurrent increases substantially and reaches a plateau at around 0.30 V for TiO 2 , TiO 2 −APS, and TiO 2 −Co 9 POM.…”