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Communication Dans Un Congrès Année : 2023

Surface Modification of Photocatalysts with Bimetallic Nanoparticles for Hydrogen Generation.

Résumé

Development of efficient photocatalysts under solar light for water and air treatment and solar fuel production is a main challenge to solve energy and environment issues. TiO2 is a very efficient photocatalyst due to its photocatalytic activity, high photochemical stability and low cost. The limitation in TiO2 application results from low quantum yield due to fast charge carriers (electron/hole e-/h+) recombination and its activation only under UV irradiation because of the value of its band gap. Its surface modification with metal nanoparticles (NPs) can lead to enhancement of the photo-conversion quantum yield and may allow the extension of the light absorption of wide band-gap semiconductors to the visible light.1- In particular, plasmonic photocatalysts have appeared as a very promising way to induce a photocatalytic activity of TiO2 in the visible range.1 On another hand, conjugated polymer (CP) nanostructures emerge as a new class of photocatalysts, which are very active under visible light.2 TiO2 and CP photocatalysts were surface-modified with mono- and bi-metallic nanoparticles induced by radiolysis.2-4 Radiolysis is a powerful method to synthesize bimetallic nanoparticles of controlled size, composition and structure in solutions and on supports. Time Resolved Microwave Conductivity (TRMC) is a very useful technique to study charge-carrier dynamics and to understand the effect of semiconductor modification on their photocatalytic activity. Modification of TiO2 or CP nanostructures with bimetallic nanoparticles can lead to much higher photocatalytic activity than their monometallic counterparts, and synergistic effects can be obtained with nanoalloys. Some results on modification of semiconductors (titania and CPs) with bimetallic NPs for water treatment and hydrogen generation will be presented and discussed.2-4 References [1] Mendez-Medrano, M. G.; Kowalska, E.; Lehoux, A.; Herissan, A.; Ohtani, B.; Bahena, D.; Briois, V.; Colbeau-Justin, C.; Rodriguez-Lopez, J. L.; Remita, H. J. Phys. Chem. C. 2016, 120, 25010 [2] Ghosh, S.; Kouamé, N.A.; Ramos, L.; Remita, S.; Dazzi, A.; Deniset-Besseau, A..Beaunier, P.;Goubard, F.; Aubert, P.-H.; Remita, H. Nature Materials, 2015, 14, 505 . [3] Yuan, X.; Wang, C.; Dragoe, D.; Beaunier, P.; Colbeau, C. Remita H. Appl. Catal. B: Env., 2021, 281 , 119457. [4] Yuan, X.; Dragoe, D.; Beaunier, P. ; Ramos, L. ; Méndez Medrano, M.G. ; Remita, H. J. Mater. Chem. A, 2020, 8, 268.
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hal-04250723 , version 1 (20-10-2023)

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  • HAL Id : hal-04250723 , version 1

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Hynd Remita, Andrea Mendez Medrano, Xiaojiao Yuan, Guadalupe Mendez Medranomaria, Daniel Bahena. Surface Modification of Photocatalysts with Bimetallic Nanoparticles for Hydrogen Generation.. IMRC, MRS et Société Mexicaine des Matériaux, Aug 2023, Cancun, Mexico. ⟨hal-04250723⟩
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