Room-Temperature Activation of CO2 by Dual Defect-Stabilized Nanoscale Hematite (Fe2-δO3-v): Concurrent Role of Fe and O Vacancies

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Abstract

We demonstrate that synthetically controlled concurrent stabilization of Fe and O vacancy defects on the surface of interbraided nanoscale hematite (Fe2-δO3-v) renders an interesting surface chemistry which can reduce CO2 to CO at room temperature (RT). Importantly, we realized a highly enhanced output of 410 μmol h-1 g-1 at RT, as compared to that of 10 μmol h-1 g-1 for bulk hematite. It is argued based on the activity degradation under cycling and first principles density functional theory calculations that the excess chemical energy embedded in the defect-stabilized surface is expended in this high-energy conversion process, which leads to progressive filling up of oxygen vacancies.

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Nagaraju, D., Gupta, S., Kumar, D., Jijil, C. P., Bhat, S. K., Jagadeesan, D., & Ogale, S. (2017). Room-Temperature Activation of CO2 by Dual Defect-Stabilized Nanoscale Hematite (Fe2-δO3-v): Concurrent Role of Fe and O Vacancies. ACS Omega, 2(11), 8407–8413. https://doi.org/10.1021/acsomega.7b01505

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