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Hydrothermal Cation Exchange Enabled Gradual Evolution of Au@ZnS–AgAuS Yolk–Shell Nanocrystals and Their Visible Light Photocatalytic Applications
Advanced Science ( IF 14.3 ) Pub Date : 2017-11-20 , DOI: 10.1002/advs.201700376
Jingwen Feng 1 , Jia Liu 1 , Xiaoyan Cheng 1 , Jiajia Liu 1 , Meng Xu 1 , Jiatao Zhang 1
Affiliation  

Yolk–shell hybrid nanoparticles with noble metal core and programmed semiconductor shell composition may exhibit synergistic effects and tunable catalytic properties. In this work, the hydrothermal cation exchange synthesis of Au@ZnS–AgAuS yolk–shell nanocrystals (Y–S NCs) with well‐fabricated void size, grain‐boundary‐architectured ZnS–AgAuS shell and in situ generated Au cocatalyst are demonstrated. Starting from the novel cavity‐free Au@AgAuS core‐shell NCs, via aqueous cation exchange reaction with Zn2+, the gradual evolution with produced Au@ZnS–AgAuS Y–S NCs can be achieved successfully. This unprecedented evolution can be reasonably explained by cation exchange initialized chemical etching of Au core, followed by the diffusion through the shell to be AgAuS and then ZnS. By hydrothermal treatment provided optimal redox environment, Au ions in shell were partially reduced to be Au NCs on the surface. The UV–vis absorption spectra evolution and visible light photocatalytic performances, including improved photodegradation behavior and photocatalytic hydrogen evolution activity, have demonstrated their potential applications. This new one‐pot way to get diverse heterointerfaces for better photoinduced electron/hole separation synergistically can be anticipated for more kinds of photocatalytic organic synthesis.

中文翻译:

水热阳离子交换使Au@ZnS–AgAuS蛋黄壳纳米晶体的逐步演化及其可见光光催化应用

具有贵金属核和编程半导体壳成分的蛋黄-壳杂化纳米粒子可能表现出协同效应和可调催化性能。在这项工作中,演示了水热阳离子交换合成具有精心设计的空隙尺寸、晶界结构的 ZnS-AgAuS 壳和原位生成的 Au 助催化剂的 Au@ZnS-AgAuS 蛋黄壳纳米晶体(Y-S NC)。从新型无空腔Au@AgAuS核壳NCs开始,通过与Zn 2+的水性阳离子交换反应,可以成功地逐步演化出Au@ZnS–AgAuS Y–S NCs。这种史无前例的演变可以通过阳离子交换引发的 Au 核化学蚀刻,然后通过壳扩散成为 AgAuS,然后是 ZnS 来合理地解释。通过水热处理提供了最佳的氧化还原环境,壳中的Au离子部分被还原为表面的Au NCs。紫外可见吸收光谱的演变和可见光光催化性能,包括改进的光降解行为和光催化析氢活性,已经证明了它们的潜在应用。这种新的一锅法可以获得多种异质界面,以实现更好的光诱导电子/空穴协同分离,可用于更多种类的光催化有机合成。
更新日期:2017-11-20
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