Breaking the activity-stability trade-off of Au catalysts by depth-controlled TiO2 nanotraps

Tang, Yunge; Ma, Xiangyu; Du, Xudong; Liu, Xiao; Chen, Rong; Shan, Bin

doi:10.1016/j.jcat.2023.05.002

Cited by 6 publications

(1 citation statement)

References 48 publications

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“…Au nanoparticle-modified TiO 2 (Au/TiO 2 ) was prepared according to the study . Briefly, 1.0 g of TiO 2 (Sigma-Aldrich) was first added into 47.0 mL of deionized water, which was stirred continuously, and then 3.0 mL of 48.5 mM H 2 AuCl 4 solution (Sinopharm Chemical Reagent Co., Ltd.) was added and stirred for 10 min.…”

Section: Methodsmentioning

confidence: 99%

Commonly Existing Hole-Capturer Organics Adsorption-Induced Recombination over Metal/Semiconductor Perimeters: A Possible Important Factor Affecting Photocatalytic Efficiencies

Xu,

Wen,

Zhao

et al. 2024

Langmuir

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Photocatalysis is a physiochemical effect arising from the relaxation of photoinduced electrons from the conduction band to the valence band. Controlling the electron relaxation to occur through photocatalytic pathways and prohibiting other relaxations is the main scientific thought for photocatalytic studies. It is needed to know the parallel relaxation pathways that can compete with photocatalytic reactions. By means of in situ photoconductances (PCs) and photoinduced absorptions (PAs), the current research studied the photoinduced electron relaxations of the Au/TiO2 in different atmospheres and at different temperatures. The PC and PA relaxations became different and fast when methanol, ethanol, isopropanol, and acetone were introduced; they also tend to decrease as temperature increases, while that of the undecorated TiO2 in all atmospheres and the Au/TiO2 in pure N2 increased. The results indicated that the organic adsorptions over the Au/TO2 perimeters change the relaxation pathway, and a hole-capturing organics adsorption-induced recombination over the Au/TiO2 perimeter was proposed to explain the relaxations. We found that this relaxation also exists for Ag/TiO2, Pt/TiO2, and Au/ZnO, so it is a commonly existing physical course for the metal/semiconductor (M/S) materials. The effect of the organics and M/S structures on the relaxation was discussed, and the relationship with photocatalytic reactions was also analyzed. Our finding means that blocking this relaxation pathway is an effective way to increase photocatalytic activities, which might open a door for highly active photocatalyst developments.

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Section: Methodsmentioning

confidence: 99%

Commonly Existing Hole-Capturer Organics Adsorption-Induced Recombination over Metal/Semiconductor Perimeters: A Possible Important Factor Affecting Photocatalytic Efficiencies

Xu,

Wen,

Zhao

et al. 2024

Langmuir

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Effective Prevention of Palladium Metal Particles Sintering by Histidine Stabilization on Silica Catalyst Support

Cahyanto,

Chen,

Lam

et al. 2024

Adv Funct Materials

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A robust method for enhancing the dispersion and stabilization of small metal nanoparticles in heterogeneous catalysts is developed. It involves in situ complexation of palladium(II) by histidine, in water, prior to impregnation in fumed silica. TEM images show that the histidine facilitates dispersion of the Pd(II) into finer nanoscale particles (≈2 nm) uniformly distributed on the support, rather than the large clusters (≈5 nm) seen in the absence of histidine. After hydrogen reduction, assessments using CO chemisorption and propylene hydrogenation indicate that the coordinated histidine might obscure the active sites on the Pd particles. However, as histidine decomposes between 220 and 300 °C in air, these materials are treated at 225 °C in air for 48 h. Afterwards the Pd(II) particles remain the same size, but after hydrogen reduction, there is a 2.4‐fold increase in CO gas adsorption, indicative of an expanded Pd surface area. Furthermore, superior catalyst stability (activity >200 h) is observed during propylene hydrogenation at 250 °C. This is consistent with histidine use having generated widely spaced, uniformly small, Pd nanoparticles on the silica support which is expected to help prevent agglomeration (sintering) during catalysis. This is a convenient low‐cost strategy for reducing metal content, preventing sintering and optimizing catalyst performance.

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Efficient photocatalytic preparation of 2,5-furandicarboxylic acid on bimetallic Fe/Au decorated TiO2

Li,

Wang,

Ruan

et al. 2024

Applied Surface Science

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Breaking the activity-stability trade-off of Au catalysts by depth-controlled TiO2 nanotraps

Cited by 6 publications

References 48 publications

Commonly Existing Hole-Capturer Organics Adsorption-Induced Recombination over Metal/Semiconductor Perimeters: A Possible Important Factor Affecting Photocatalytic Efficiencies

Commonly Existing Hole-Capturer Organics Adsorption-Induced Recombination over Metal/Semiconductor Perimeters: A Possible Important Factor Affecting Photocatalytic Efficiencies

Effective Prevention of Palladium Metal Particles Sintering by Histidine Stabilization on Silica Catalyst Support

Efficient photocatalytic preparation of 2,5-furandicarboxylic acid on bimetallic Fe/Au decorated TiO2

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