标题：Doping strategy to promote the charge separation in BiVO4photoanodes
作者：Zhang, Bo ;Zhang, Haipeng ;Wang, Zeyan ;Zhang, Xiaoyang ;Qin, Xiaoyan ;Dai, Ying ;Liu, Yuanyuan ;Wang, Peng ;Li, Yingjie ;Huang, Baibiao
作者机构：[Zhang, Bo ;Zhang, Haipeng ;Wang, Zeyan ;Zhang, Xiaoyang ;Qin, Xiaoyan ;Liu, Yuanyuan ;Wang, Peng ;Huang, Baibiao ] State Key Laboratory of Crystal Ma 更多
来源：Applied Catalysis B: Environmental
摘要：We fabricated Mo:BiVO4/Co:BiVO4photoanodes by depositing Co:BiVO4layers on top of Mo:BiVO4layers, and demonstrated the enhanced PEC performances with improved charge separation both in the bulk and at the interface by doping strategy in this work. Co:BiVO4layers in Mo:BiVO4/Co:BiVO4photoanodes were found to be important for the enhanced charge separation efficiencies. The surface exposed Co2+ions in Co:BiVO4layers can act as reactive sites for water oxidation to promote the interfacial charge separation. While, the Co2+doping inside Co:BiVO4cannot only tune the built in electric fields in Mo:BiVO4/Co:BiVO4homojunctions, but also be able to optimize the charge transport in Co:BiVO4layers to facilitate the bulk charge separation. By optimizing the Co contents and the number of Co:BiVO4layers in Mo:BiVO4/Co:BiVO4photoanodes, 3Mo-1Co-6% consisted of 3 layers of 3% Mo:BiVO4and 1 layer 6% Co:BiVO4yields the highest photocurrent of 2.09 mA/cm2at 1.23 V vs RHE, with a ηband ηivalue of 77.8% and 86.5%, respectively. This work provides a new thread for the design and fabrication of photoanode with high charge separation efficiencies by doping strategy, which could be helpful for the further improvement of PEC water splitting performances.