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Unassisted Photoelectrochemical H 2 O 2 Production with In Situ Glycerol Valorization Using α-Fe 2 O 3 .
Nano Letters 2024 March 26
Photoelectrochemical (PEC) H2 O2 production via two-electron O2 reduction is promising for H2 O2 production without emitting CO2 . For PEC H2 O2 production, α-Fe2 O3 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 H2 O2 . However, a significant overpotential for water oxidation is required due to the poor surface properties of α-Fe2 O3 . Thus, unassisted solar H2 O2 production is not yet possible. Herein, we demonstrate unassisted PEC H2 O2 production using α-Fe2 O3 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 H2 O2 production, respectively, with high stability for 25 h. Our results indicate that unassisted and stable PEC H2 O2 production is feasible with in situ glycerol valorization using the α-Fe2 O3 photoanode.
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