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Self-assembled Janus plasmene nanosheets as flexible 2D photocatalysts
Materials Horizons ( IF 13.3 ) Pub Date : 2020-10-26 , DOI: 10.1039/d0mh01275k
Runfang Fu 1 , Qianqian Shi , Zijun Yong , James C Griffith , Lim Wei Yap , Wenlong Cheng
Affiliation  

A leaf is a free-standing photocatalytic system that can effectively harvest solar energy and convert CO2 and H2O into carbohydrates in a continuous manner without the need for regeneration or tedious product extraction steps. Despite encouraging advances achieved in designing artificial photocatalysts, most of them function in bulk solution or on rigid surfaces. Here, we report on a 2D flexible photocatalytic system based on close packed Janus plasmene nanosheets. One side of the Janus nanosheets is hydrophilic with catalytically active palladium, while the opposite side is hydrophobic with plasmonic nanocrystals. Such a unique design ensures a stable nanostructure on a flexible polymer substrate, preventing dissolution/degradation of plasmonic photocatalysts during chemical conversion in aqueous solutions. Using catalytic reduction of 4-nitrophenol as a model reaction, we demonstrated efficient plasmon-enhanced photochemical conversion on our flexible Janus plasmene. The photocatalytic efficiency could be tuned by adjusting the palladium thickness or types of constituent building blocks or their orientations, indicating the potential for tailor-made catalyst design for desired reactions. Furthermore, the flexible Janus plasmene nanosheets were designed into a small 3D printed artificial tree, which could continuously convert 30 mL of chemicals in 45 minutes.

中文翻译:

作为柔性二维光催化剂的自组装 Janus 等离子体纳米片

叶子是一种独立的光催化系统,可以有效地收集太阳能并转化CO 2和H 2O 以连续方式转化为碳水化合物,无需再生或繁琐的产品提取步骤。尽管在设计人造光催化剂方面取得了令人鼓舞的进展,但它们中的大多数都在本体溶液或刚性表面上起作用。在这里,我们报告了基于紧密堆积的 Janus 等离子体纳米片的二维柔性光催化系统。Janus 纳米片的一侧是亲水的,具有催化活性的钯,而另一侧是疏水的,具有等离子体纳米晶体。这种独特的设计确保了柔性聚合物基底上的稳定纳米结构,防止了等离子光催化剂在水溶液中的化学转化过程中的溶解/降解。以 4-硝基苯酚的催化还原为模型反应,我们在灵活的 Janus 等离子体上展示了有效的等离子体增强光化学转换。可以通过调整钯的厚度或组成结构单元的类型或它们的方向来调整光催化效率,这表明为所需反应量身定制催化剂设计的潜力。此外,灵活的 Janus 等离子体纳米片被设计成一个小型 3D 打印人造树,可以在 45 分钟内连续转换 30 mL 的化学物质。
更新日期:2020-11-27
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