Photoelectrochemical generation of H2O2 using hematite (α-Fe2O3) and gas diffusion electrode (GDE)

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2025-01-16 DOI:10.1016/j.cattod.2025.115206

T. Imrich , T. Nakata , T. Ohno , J. Krýsa

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引用次数: 0

Abstract

In contrast to the industrial-scale production of H₂O₂, electrochemical or photoelectrochemical synthesis is an environmentally friendly alternative. In this study, the photoelectrochemical generation of H₂O₂ was investigated using a hematite (α-Fe₂O₃/FTO/glass) photoanode in combination with a gas diffusion electrode (GDE) modified by the incorporation of tin(II) phthalocyanine (SnPc) in its hydrophilic layer. The experiments were conducted in a photoelectrochemical cell with two compartments separated by a proton exchange membrane, under an applied bias and AM1.5 irradiation (100 mW/cm²). The amount of H₂O₂ generated was quantified through chemical analysis using visible light spectrophotometry of the electrolyte. To assess the process efficiency, the Faradaic efficiency (FE) was calculated. The optimal configuration employed air as the inlet gas for the GDE and phosphate buffer (pH 6.4) as the electrolyte in the cathodic compartment. The combination of the hematite photoanode and the GDE modified with SnPc was the most effective for H₂O₂ photoelectrochemical generation. The highest FE values achieved were 52.4 % for the GDE (O₂ reduction to H₂O₂) and 0.4 % for the hematite photoanode (H₂O oxidation to H₂O₂).

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.