Photoelectrochemical (PEC) H₂O₂ production via two-electron O₂ reduction is promising for H₂O₂ production without emitting CO₂. For PEC H₂O₂ production, α-Fe₂O₃ is an ideal semiconductor owing to its earth abundance, superior stability in water, and an appropriate band gap for efficient solar light utilization. Moreover, its conduction band is suitable for O₂ reduction to produce H₂O₂. However, a significant overpotential for water oxidation is required due to the poor surface properties of α-Fe₂O₃. Thus, unassisted solar H₂O₂ production is not yet possible. Herein, we demonstrate unassisted PEC H₂O₂ production using α-Fe₂O₃ for the first time by applying glycerol oxidation, which requires less bias compared with water oxidation. We obtain maximum Faradaic efficiencies of 96.89 ± 0.6% and 100% for glycerol oxidation and H₂O₂ production, respectively, with high stability for 25 h. Our results indicate that unassisted and stable PEC H₂O₂ production is feasible with in situ glycerol valorization using the α-Fe₂O₃ photoanode.

中文翻译：

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使用 α-Fe2O3 原位甘油增值无辅助光电化学生产 H2O2

通过双电子O 2 还原的光电化学（PEC）H 2 O 2 生产_有望在_不排放_CO 2的情况下生产_{H 2} O ₂。对于PEC H ₂ O ₂生产，α-Fe ₂ O ₃是一种理想的半导体，因为它在地球上储量丰富，在水中具有优异的稳定性，并且具有适合有效利用太阳光的带隙。而且其导带适合O ₂还原生成H ₂ O ₂。然而，由于α-Fe ₂ O ₃的表面性质较差，因此需要显着的水氧化过电势。因此，无辅助太阳能生产H ₂ O ₂尚不可能。在此，我们首次通过应用甘油氧化证明了使用α-Fe ₂ O _{3进行无辅助PEC H 2} O _{2生产，与水氧化相比，这需要更少的偏差。我们获得了甘油氧化和 H 2} O ₂生产的最大法拉第效率分别为 96.89 ± 0.6% 和 100% ，并且在 25 小时内具有高稳定性。我们的结果表明，使用 α-Fe ₂ O _3光电阳极原位甘油增值，无辅助且稳定的 PEC H ₂ O ₂生产是可行的。