Fe₂O₃ is a promising semiconductor for photoelectrochemical (PEC) water decomposition. However, severe charge recombination problems limit its applications. In this study, a F–Fe₂O_3–x/MoS₂ nanorod array photoanode was designed and prepared to facilitate charge separation. Detailed characterization and experimental results showed that F doping in Fe₂O₃ regulated the electronic structure to improve the conductivity of Fe₂O₃ and induced abundant oxygen vacancies to increase the carrier concentration and promote charge separation in bulk. In addition, the internal electric field between F–Fe₂O_3–x and MoS₂ facilitated the qualitative transfer of the photogenerated charge, thus inhibiting their recombination. The synergistic effect between the oxygen vacancy and F–Fe₂O_3–x/MoS₂ heterojunction significantly enhanced the PEC performance of Fe₂O₃. This study provides a universal strategy for designing other photoanode materials with high-efficiency charge separation.

中文翻译：

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利用缺陷工程和异质结构构建提高氧化铁(III)光电化学分解水性能

Fe ₂ O ₃是一种很有前景的光电化学（PEC）水分解半导体。然而，严重的电荷复合问题限制了其应用。在本研究中，设计并制备了F–Fe ₂ O _{3– x} /MoS ₂纳米棒阵列光阳极以促进电荷分离。详细的表征和实验结果表明，Fe ₂ O _{3中的F掺杂调节了电子结构，提高了Fe 2} O ₃的电导率，并诱导了丰富的氧空位，增加了载流子浓度，促进了电荷分离。此外，F-Fe ₂ O _{3- x}和MoS ₂之间的内部电场促进了光生电荷的定性转移，从而抑制了它们的复合。氧空位与F-Fe ₂ O _{3- x} /MoS _{2异质结之间的协同效应显着增强了Fe 2} O ₃的PEC性能。这项研究为设计其他具有高效电荷分离的光电阳极材料提供了通用策略。