Boosting Charge Transfer of Fe Doping BiVO4/CoO (x) for Photoelectrochemical Water Splitting

Chargeseparation efficiency is the main obstacle to limiting thephotoelectrochemical (PEC) water-splitting performance of bismuthvanadate (BiVO4) photoanodes. Herein, we report a convenientand efficient strategy for Fe doping into BiVO4 and hybridCoO (x) OECs to obtain a Fe-BiVO4/CoO (x) photoanode. The resulting photoanodeexhibits 4.0 mA/cm(2) photocurrent density as well as a highcharge transfer (74.4%)/separation efficiency (71.2%) at 1.23 V vsreversible hydrogen electrode (RHE) under AM 1.5 G illumination. Thesynergistic effect of Fe doping and CoO (x) OEC loading can dramatically boost the electrical conductivity andcarrier density of BiVO4. This work provides effectiveexperimental data for improving the PEC performance of BiVO4.

Automated summary

This study presents a convenient and efficient strategy for Fe doping into BiVO4 and hybrid CoO(x) OECs to achieve a Fe-BiVO4/CoO(x) photoanode. The resulting photoanode demonstrates a photocurrent density of 4.0 mA/cm2 and high charge transfer (74.4%)/separation efficiency (71.2%) at 1.23 V vs RHE under AM 1.5 G illumination. The synergistic effect of Fe doping and CoO(x) OEC loading significantly enhances the electrical conductivity and carrier density of BiVO4. This work provides valuable experimental data for improving the PEC performance of BiVO4.