Au/TiO 2 (P25)-gC 3 N 4 composites with low gC 3 N 4 content enhance TiO 2 sensitization for remarkable H 2 production from water under visible-light irradiation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nano Energy Année : 2020

Au/TiO 2 (P25)-gC 3 N 4 composites with low gC 3 N 4 content enhance TiO 2 sensitization for remarkable H 2 production from water under visible-light irradiation

Résumé

A series of ternary Au/TiO 2 (P25)-gC 3 N 4 heterostructure photocatalysts with low Au nanoparticle (NP) loading and gC 3 N 4 content were synthesized and evaluated for H 2 production from water with a very low amount of sacrificial agent (1 vol%) under solar and visible-light irradiation. The optimized composite, 0.3 wt% Au/ TiO 2 (P25)-gC 3 N 4 (95-5), exhibited a remarkable production rate under visible light (419 μmol À 1 h À 1 g catalyst of H 2), corresponding to almost twice the cumulated H 2 production over 2.5 h as that of the Au/TiO 2 (P25) reference. To best of our knowledge, this high of a yield has never been reported for comparable experimental conditions. The highest performing composite was characterized using UV-vis, XPS, UPS, BET, TEM, and TRMC techniques. The performance of the photocatalyst could be correlated to contributions of various phenomena such as effective heterojunction formation of TiO 2 with gC 3 N 4 operating in a Z-scheme dynamic allowing TiO 2 photosensitization towards visible-light, also leading to new electronic hybrid states, and plasmonic Au/support Schottky junction allowing electronic trapping sites and co-catalytic effects. These contributions resulted in more efficient light harvesting and separation of the charge carriers to enhance visible light driven activity.

Domaines

Chimie Catalyse
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Dates et versions

hal-02928198 , version 1 (05-11-2020)

Identifiants

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Pablo Jiménez-Calvo, Valérie Caps, Mohamed Nawfal Ghazzal, Christophe Colbeau-Justin, Valérie Keller. Au/TiO 2 (P25)-gC 3 N 4 composites with low gC 3 N 4 content enhance TiO 2 sensitization for remarkable H 2 production from water under visible-light irradiation. Nano Energy, 2020, 75, ⟨10.1016/j.nanoen.2020.104888⟩. ⟨hal-02928198⟩
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