Photo-Assisted Sequential Assembling of Uniform Metal Clusters With Sub-Nanometers on Semiconductor Supports

Haocheng Wu, Wentao Jiang, Liyi Shi, Rengui Li, Lei Huang, Can Li
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Abstract

Dispersing metal subnano-clusters on the oxide supports is attracting close attention in heterogeneous catalysis, but great challenges still lie in controlling the size and dispersion of subnano-clusters due to the inevitable agglomeration. Here, we propose a sequential photochemical deposition strategy named “first store, and then release” to uniformly fabricate the size-controlling noble metal subnano-clusters on semiconductor oxides. Using the typical semiconductor TiO2, the photoexcited electrons can be first stored as reduced species (e.g. Ti3+) under irradiation and the Ti3+ species can optimize both the nucleation and growth processes in dark reaction, resulting in a uniform dispersing of various noble metals (Au, Pt, Ag etc.) with size diameters of ~1 nm. The subnano-clusters catalysts exhibited superior performance in catalytic oxidation of HCHO compared with that of nanoparticles. This work brings a new and useful strategy to construct size-controlling noble metals on the oxide supports for heterogeneous catalysis and the related fields.
半导体支架上亚纳米均匀金属团簇的光辅助顺序组装
在氧化物载体上分散金属亚纳米团簇是非均相催化研究的热点,但由于不可避免的团聚现象,如何控制亚纳米团簇的大小和分散仍是一大挑战。本文提出了一种“先储存后释放”的顺序光化学沉积策略,以均匀地在半导体氧化物上制备尺寸可控的贵金属亚纳米团簇。使用典型的半导体TiO2,光激发的电子在辐照下首先以还原态(如Ti3+)的形式储存,并且Ti3+可以在暗反应中优化成核和生长过程,从而使各种贵金属(Au, Pt, Ag等)均匀分散,直径约为1 nm。亚纳米团簇催化剂对HCHO的催化氧化性能优于纳米颗粒催化剂。本研究为在非均相催化及相关领域的氧化物载体上构建尺寸控制贵金属提供了一种新的有用策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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