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Photocatalyseurs hétérostructurés LaFeO₃/g-C₃N₄ pour la production d’hydrogène

Abstract : Hydrogen is a promising energy carrier for replacing fossil fuels, under the conduction of having a mainly low carbon production. One of the most promising solution to generate clean and durable hydrogen is water splitting from solar energy. This manuscript focuses on the development and optimization of an abundant and stable photocatalyst. LaFeO₃ is a perovskite semi-conductor material showing and excellent chemical stability and that absorbs a large part in the visible spectra, although a low electron transfer limits its photocatalytic properties. To improve its activity, a heterostructure associating LaFeO₃ with g-C₃N₄ was realised. g-C₃N₄ is an organic semi-conductor with outstanding optical, structural, and electronic properties. Their association led to a significant increase in the photocatalytic activity by an increase in the separation and transfer of charge carriers. Two methods for H₂ production were studied: photocalysis (PC) and photoelectrocatalysis (PEC). Photoelectrodes of PEC dispositive were elaborated by magnetron sputtering and nanoparticles dispersed in solution of PC dispositive were synthesised using sol-gel. The insertion of a layer of g-C₃N₄, deposited by spin coating, below the LaFeO₃ films allowed for the first time to prepare this heterojunction using thin films, while the sonication of particles of LaFeO₃ and g-C₃N₄ allowed creating a heterojunction of dispersed photocatalysts. The impact of the composition of photoelectrodes was also studied for non-stoichiometric films and by inserting additional metallic elements.
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Submitted on : Tuesday, February 2, 2021 - 9:47:48 AM
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Vincent Guigoz. Photocatalyseurs hétérostructurés LaFeO₃/g-C₃N₄ pour la production d’hydrogène. Génie des procédés. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0148⟩. ⟨tel-03128188⟩



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