Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
ACS Appl Mater Interfaces. 2013 Feb;5(3):1031-7. doi: 10.1021/am302726y. Epub 2013 Jan 15.
Au-nanoparticle-decorated ZnS nanoarchitectures were fabricated by a simple hydrothermal approach combined with a deposition-precipitation method. After the deposition-precipitation process, 5-nm Au nanoparticles were homogeneously dispersed on the ZnS surface. In addition, the band gap of ZnS was also narrowed by the incorporation of a small amount of Au(I) ions. The photocatalytic hydrogen production activities of all the samples were evaluated by using Na(2)S and Na(2)SO(3) as sacrificial reagents in water under a 350 W xenon arc lamp. The results show that the photocatalytic hydrogen production rate of ZnS nanoarchitectures can be significantly improved by loading Au cocatalysts and reaches an optimal value (3306 μmol h(-1) g(-1)) at the Au content of 4% wt. Although strong surface plasmon resonance (SPR) absorption of the Au nanoparticles was found in the Au-loaded samples, all of these samples exhibit no activities in the visible light region (λ > 420 nm). On the basis of this Au/ZnS system, the possible roles of Au deposition in improving the photocatalytic hydrogen production activity, especially the necessary condition for SPR effect of metal nanostructures to function in the visible-light photocatalysis, are critically discussed.
采用简单的水热法结合沉积-沉淀法制备了金纳米粒子修饰的 ZnS 纳米结构。沉积-沉淀过程后，5nm 的 Au 纳米粒子均匀分散在 ZnS 表面。此外，少量 Au（I）离子的掺入也缩小了 ZnS 的带隙。通过在 350 W 氙弧灯下在水中使用 Na(2)S 和 Na(2)SO(3)作为牺牲试剂，评估了所有样品的光催化制氢活性。结果表明，负载 Au 助催化剂可以显著提高 ZnS 纳米结构的光催化制氢速率，在 Au 含量为 4wt%时达到最佳值（3306 μmol h(-1) g(-1)）。尽管在负载 Au 的样品中发现了 Au 纳米粒子的强表面等离子体共振（SPR）吸收，但所有这些样品在可见光区域（λ>420nm）均无活性。基于该 Au/ZnS 体系，我们批判性地讨论了 Au 沉积在提高光催化制氢活性中的可能作用，特别是金属纳米结构的 SPR 效应在可见光光催化中发挥作用的必要条件。
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