Hydrogen Production System by Light‐Induced α‐FeOOH Coupled with Photoreduction

Abstract

Solar‐driven catalysts on semiconductors to produce hydrogen are considered as a means to solve environmental issues. In this study, H2 production coupling with oxygen consumption by noble metal‐free α‐FeOOH was demonstrated even though the conduction band edge was lower than the reduction potential of H+ to H2. For activation of α‐FeOOH, an electron donor, Hg‐Xe irradiation, and low pH (ca. 5) were indispensable factors. The H2 production from H2O was confirmed by GC‐MS using isotope‐labeled water (D2O) and deuterated methanol. The α‐FeOOH synthesized by coprecipitation method showed 25 times more active than TiO2. The photocatalytic activity was stable for over 400 h. Our study suggests that α‐FeOOH known as rust can produce H2 by light induction.

Scavenging of Organic Pollutant and Fuel Generation through Cost-Effective and Abundantly Accessible Rust: A Theoretical Support with DFT Simulations

“…The production of H 2 attracts attention because it is essential for fuel and chemical reactions [2,69]. H 2 is a sustainable and green form of energy with high energy density, abundance, low cost, and environmentally friendly nature, which makes it an ideal alternative energy candidate to fossil fuels [70].…”

Engineering Z-Scheme FeOOH/PCN with Fast Photoelectron Transfer and Surface Redox Kinetics for Efficient Solar-Driven CO2 Reduction

“…Accordingly, such structure enables FeOOH with reduced mass transfer resistance and rich coordinatively unsaturated sites to facilitate surface water oxidation kinetics. − This is verified by the photocatalytic test of the sole oxygen evolution from water, from which pristine FeOOH exhibits more considerable activity than Fe 2 O 3 (Figure S4). However, the conduction band minimum of FeOOH usually locates at ∼0.3 V vs RHE and is less negative than the redox potential of CO 2 /CH 4 (−0.24 V vs RHE), thus being incapable for CO 2 reduction from a thermodynamic point of view. Therefore, the π-conjugated PCN, with robust photoinduced electrons, broad light response, and tunable structural properties, was selected as the reduction semiconductor for CO 2 reduction .…”

Scavenging of Organic Pollutant And Fuel Generation Through Cost-Effective And Abundantly Accessible Rust: An Economical Approach For Waste Management And Energy Generation

“…Production of H 2 attracts attention because it is essential for fuel and chemical reactions (Yamada et al 2020). Both calcined and uncalcined were also utilized for water splitting.…”