Pd/Ag and Pd/Au bimetallic nanocatalysts on mesoporous silica for plasmon-mediated enhanced catalytic activity under visible light irradiation
Pd/Ag and Pd/Au bimetallic nanocatalysts on mesoporous silica for plasmon-mediated enhanced catalytic activity under visible light irradiation
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DOI：
10.1039/c6ta01664b
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发表时间：
2016-06
影响因子：
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通讯作者：
Priyanka Verma;Yasutaka Kuwahara;K. Mori;H. Yamashita
中科院分区：
文献类型：
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作者：
Priyanka Verma;Yasutaka Kuwahara;K. Mori;H. Yamashita
系统地比较了等离子体性质和催化性能与Pd沉积的等离子体Ag和Au的纳米结构。采用微波辅助醇还原法合成了介孔氧化硅（SBA-15）负载Ag和Au纳米粒子（NPs）。1-己醇和乙二醇分别用作Ag和Au前体的还原剂，这取决于它们获得金属NP的还原能力。在可见光照射下，通过局部表面等离子体共振（LSPR）辅助沉积实现了用Pd NPs的进一步装饰。通过各种表征技术，如紫外-可见光谱、EXAFS、TEM、EDX和XPS，证实了纳米粒子的形成。所得Pd/Au和Pd/Ag纳米粒子分别在Suzuki偶联反应和氨硼烷（AB）制氢中表现出特定的光催化活性。此外，我们还探讨了等离子体激元催化剂由于周围环境和电子注入的变化而可能具有的可调谐性。
A systematic comparison of plasmonic properties and catalytic performances has been performed with Pd deposited bimetallic nanostructures of plasmonic Ag and Au. Mesoporous silica (SBA-15) supported Ag and Au nanoparticles (NPs) were synthesized using a microwave assisted alcohol reduction system. 1-Hexanol and ethylene glycol were employed as reducing agents for Ag and Au precursors, respectively, depending on their reduction ability to obtain metallic NPs. Further decoration with Pd NPs was achieved via localized surface plasmon resonance (LSPR)-assisted deposition under visible light irradiation. The formation of bimetallic NPs was confirmed by various characterization techniques, such as UV-vis spectroscopy, EXAFS, TEM, EDX and XPS. The obtained Pd/Au and Pd/Ag NPs exhibited specific photocatalytic activity in the Suzuki coupling reaction and hydrogen production from ammonia borane (AB), respectively. Moreover, we have explored the possible tunability of the plasmonic catalysts owing to change in the surrounding environment and electron injection.