BiVO 4 /Bi 2 S 3 heterojunction decorated by Pt and FeOOH double cocatalysts to enhance photoelectrochemical degradation of Rhodamine B

The performance of photoelectrochemical (PEC) degradation is mainly influenced by the efficient separation and transfer of photogenerated charge carriers and the excellent light absorption properties of photoelectrodes. Therefore, the Pt/BiVO 4 /Bi 2 S 3 /FeOOH photoelectrode was firstly designed for improving PEC degradation performance by combining the cooperative action of double cocatalysts and BiVO 4 /Bi 2 S 3 heterojunction. As expected, the Pt/BiVO 4 /Bi 2 S 3 /FeOOH photoelectrode exhibits an improved photocurrent of 4.35 mA/cm 2 with 1.23 V vs. RHE under visible light in a 0.2 M Na 2 SO 4 electrolyte with 5 mg/L Rhodamine B (RhB), which is about 11.1 times than pristine BiVO 4 . Meanwhile, the efficient PEC degradation of 91% was obtained of Pt/BiVO 4 /Bi 2 S 3 /FeOOH. These results indicate BiVO 4 /Bi 2 S 3 heterojunctions inhibit charge recombination due to the driving effect of different energy effects and Bi 2 S 3 displays a light collector for abundant light absorption; subsequently, the double cocatalysts of Pt and FeOOH were accepted to accelerate carrier separation and improve photoelectrode stability. This research may inspire the rational combination of double cocatalysts to synergistic enhance semiconductors heterojunction in PEC degradation performance.