Abstract
Coupling oxygen evolution catalyst (OEC) as a cocatalyst is a promising strategy to accelerate the oxygen evolution reaction (OER) kinetics. However, the charge transfer at the cocatalyst/semiconductor interface has been considered as the limiting factor. Meanwhile, the real action mechanism of the cocatalyst on the photoanode/electrolyte interface needs to be explored completely in building efficient photoanodes. Herein, FeNiSn(OH)6 modified Ti-doped α-Fe2O3 with good interface contact was synthesized by the co-precipitation and then post-annealing treatment. The results reveal a significant improvement in separation efficiency is guaranteed by the good interface contact between Ti-Fe2O3 and FeNiSn(OH)6 and the increased charge carrier density after the post-annealing treatment. Therefore, more photogenerated holes are captured by the surface states (SS). Additionally, the recombination behaviors of photogenerated charges at the surface are suppressed by regulating the SS after the deposition of FeNiSn(OH)6 and the post-annealing treatment. Consequently, FNS/Ti-Fe2O3-150 presents a significant 6.05-fold enhancement in photocurrent density compared to Ti-Fe2O3 (0.52 mA/cm2), accomplishing an impressive photocurrent density of 3.15 mA/cm2 at 1.23 V vs. RHE.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.