Engineering of highly active Au/Pd supported on hydrogenated urchin-like yolk@shell TiO<sub>2</sub> for visible light photocatalytic Suzuki coupling

Article Article scientifique Article Engineering of highly active Au/Pd supported on hydrogenated urchin-like yolk@shell TiO<sub>2</sub> for visible light photocatalytic Suzuki coupling eng 2019 author Rohani Sahar 906514 author Ziarati Abolfazl 900234 author Ziarani Ghodsi Mohammadi author Badiei Alireza author Buergi Thomas 727741 3820-3827 10.1039/C9CY00798A 2044-4753 http://xlink.rsc.org/?DOI=C9CY00798A Efficient smart photocatalysts and their surface engineering are necessary for the effective conversion of light energy into chemical energy in photocatalyzed organic reactions. Herein, we designed a hydrogenated urchin-like yolk@shell TiO2 structure decorated with Au and Pd nanoparticles (HUY@S-TOH@AuPd) as a robust photocatalyst for C–C coupling reactions. The resulting architecture exhibits considerable photocatalytic performance in Suzuki coupling reactions under visible light irradiation with a turnover frequency (TOF) value as high as 7095 h−1. The beauty of this engineered structure lies on the following four points: (I) the urchin-like structure provided a large accessible surface area for high light harvesting as well as high noble metal anchoring; (II) the yolk@shell mesoporous architecture improved the absorption of light by multiple scattering; (III) the presence of Ti3+ species on the surface of TiO2 decreased the band gap of the structure to the visible region; (IV) the enriched electron density of Pd through the injection of hot electrons from Au as well as the flow of electrons from the titanium dioxide semiconductor to the metals accelerated the rate-determining step. The merging of bimetallic plasmonic nanoparticles and urchin like yolk–shell hydrogenated titanium dioxide architecture can open an avenue for designing photocatalysts with high stability and promising activity as well as high direct harvesting of visible light for a broad range of photocatalytic organic reactions. Dewey 540 38 Département de chimie physique 142 false Catalysis Science and Technology 9 14 a21cd177-d694-423d-baa6-b376cb8034e1 Article (Published version) Public Engineering_TB_19.pdf 3703283 application/pdf openAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

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Engineering of highly active Au/Pd supported on hydrogenated urchin-like yolk@shell TiO₂ for visible light photocatalytic Suzuki coupling	Catalysis Science and Technology			2019	321	188

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Rohani, Sahar