Synthesis of Aliphatic Acids from CO2 and Water at Efficiencies Close to the Photosynthesis Limit Using Mixed Copper and Iron Oxide Films

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Abstract

The photocatalytic conversion of CO2 and water into value-added chemicals remains a great challenge. This study shows that uniformly mixed copper and iron oxide (CuO/CuFeO2; CFO) bulky heterojunction films are capable of converting CO2 and water into C1-C6 aliphatic acid anions and O2 at a solar-to-chemical energy conversion (STC) efficiency close to 3% under simulated sunlight in the absence of any sacrificial chemicals or electrical biases. When the CFO film is simply wired to a Pt foil, C1 (formate, with selectivity of 100%) and O2 are produced at a near-stoichiometric ratio at an STC efficiency of â5% via the Z-scheme charge transfer mechanism. The CFO films are durable over 1 week and recyclable over 5 weeks under continuous irradiation. The addition of chloride enhances formate production, with an STC efficiency of 10%, while inhibiting the deformation of CFOs. Density functional theory computations support the observed selectivity and durability.

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Kang, U., Yoon, S. H., Han, D. S., & Park, H. (2019). Synthesis of Aliphatic Acids from CO2 and Water at Efficiencies Close to the Photosynthesis Limit Using Mixed Copper and Iron Oxide Films. ACS Energy Letters, 4(9), 2075–2080. https://doi.org/10.1021/acsenergylett.9b01281

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