Abstract
The introduction of oxygen vacancies activates the visible-light photoactivity of chromium-doped TiO 2 by enhancing the efficiency of charge separation and transfer. Although computational studies have demonstrated that metal ion doping can effectively narrow the bandgap of TiO 2 , the visible-light photoactivity of metal-doped TiO 2 photoanodes is still far from satisfactory. Herein, we report an effective strategy to activate the visible-light photoactivity of chromium-implanted TiO 2 via the incorporation of oxygen vacancies. The chromium-doped TiO 2 activated by oxygen vacancies (Cr-TiO 2 -vac) exhibited an incident photon-to-electron conversion efficiency (IPCE) of ~6.8% at 450 nm, which is one of the best values reported for metal-doped TiO 2 . Moreover, Cr-TiO 2 -vac showed no obvious photocurrent decay after 100 h under visible-light illumination.
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