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首页> 外文期刊>Chemistry: A European journal >Enhancement of Ag-Based Plasmonic Photocatalysis in Hydrogen Production from Ammonia Borane by the Assistance of Single-Site Ti-Oxide Moieties within a Silica Framework
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Enhancement of Ag-Based Plasmonic Photocatalysis in Hydrogen Production from Ammonia Borane by the Assistance of Single-Site Ti-Oxide Moieties within a Silica Framework

机译：二氧化硅框架内单现场Ti氧化物部分的氨基硼烷基氢产生的Ag基于Ag的等离子体光催化

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摘要

Ag nanoparticles (NPs) have gained great attention owing to their interesting plasmonic properties and efficient catalysis under visible-light irradiation. In this study, an Ag-based plasmonic catalyst supported on mesoporous silica with isolated and tetrahedrally coordinated single-site Ti-oxide moieties, namely, Ag/Ti-SBA-15, was designed with the purpose of utilizing the broad spectral range of solar energy. The Ti-SBA-15 support allows the deposition of small Ag NPs with a narrow size distribution. The chemical structure, morphology, and optical properties of the prepared catalyst were characterized by techniques such as UV/Vis, FT extended X-ray absorption fine structure, and X-ray photoelectron spectroscopy, field-emission SEM, TEM, and N_2 physisorption studies. The catalytic activity of Ag/Ti-SBA-15 in hydrogen production from ammonia borane by hydrolysis was significantly enhanced in comparison with Ag/SBA-15 without Ti-oxide moieties and Ag/TiO_2/SBA-15 involving agglomerated TiO_2, both in the dark and under light irradiation. Improved electron transfer under light irradiation caused by the creation of heterojunctions between Ag NPs and Tioxide moieties explains the results obtained in the present study.
机译：由于其有趣的等离子体性能和在可见光照射下的有效催化，Ag纳米颗粒（NPS）效应很大。在本研究中，设计了一种基于介孔二氧化硅的基于AG基于介孔二氧化硅的等离子体催化剂，即AG / Ti-SBA-15，目的是利用广谱范围的太阳能活力。 Ti-SBA-15支持允许沉积小AG NP，窄尺寸分布。制备催化剂的化学结构，形态和光学性质的特征在于UV / VI，FT延伸X射线吸收细结构和X射线光电子光谱，现场排放SEM，TEM和N_2理由研究。与无线氧化物部分的AG / SBA-15相比，通过水解从氨硼烷的氢气产生的AG / TI-SBA-15的催化活性显着提高，涉及凝聚的TiO_2的Ag / TiO_2 / SBA-15黑暗和轻度照射。通过在Ag NPS和TiOxide部分之间产生杂癌的光照射下的电子转移解释了本研究中获得的结果。

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