Rational design of a novel quaternary ZnO@ZnS/Ag@Ag2S nanojunction system for enhanced photocatalytic H2 production†,Inorganic Chemistry Frontiers

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Rational design of a novel quaternary ZnO@ZnS/Ag@Ag2S nanojunction system for enhanced photocatalytic H2 production†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-10-10 00:00:00 , DOI: 10.1039/c8qi00828k
Yiping Su _{1,

2,

3,

4,

5} , Zhicheng Zhao _{1,

2,

3,

4,

5} , Shun Li _{1,

2,

3,

4,

5} , Fei Liu _{1,

2,

3,

4,

5} , Zuotai Zhang _{1,

2,

3,

4,

5}

Affiliation

Semiconductor photocatalysis provides a promising potential solution to the challenging issue of clean energy production. Construction of multijunction systems is an effective strategy to overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts. Here, we report a novel quaternary heterogeneous photocatalyst fabricated by loading Ag nanoparticles onto ZnO nanowires and subsequent simultaneous formation of core/shell structured ZnO@ZnS and Ag@Ag₂S heterojunctions via a one-step anion-exchange sulfuration reaction process. The resulting four-component ZnO@ZnS/Ag@Ag₂S multijunction photocatalyst exhibits a high hydrogen evolution activity (140.3 μmol g⁻¹) under simulated solar light irradiation in 5 h, far exceeding those of bare ZnO (30.8 μmol g⁻¹), ZnO@ZnS (92.8 μmol g⁻¹) and ZnO/Ag (45.1 μmol g⁻¹) counterparts. The enhanced photocatalytic activity can be attributed to the synergetic effect of the formation of both Z-scheme and type II core/shell heterojunctions, favoring light absorption and separation of photogenerated electron–hole pairs in the composite. This work provides a facile, controlled method for the fabrication of multicomponent heterostructures used for efficient solar water splitting.

中文翻译：

新型季铵化ZnO @ ZnS / Ag @ Ag ₂ S纳米结体系的合理设计，以增强光催化H _2的产生†

半导体光催化技术为解决清洁能源生产这一具有挑战性的问题提供了有希望的潜在解决方案。多结系统的构建是克服快速电荷重组和半导体光催化剂可见光吸收受限的严重缺陷的有效策略。在这里，我们报告了一种新型的季铵多相光催化剂，该催化剂是通过将Ag纳米颗粒加载到ZnO纳米线上并随后通过一步阴离子交换硫化反应过程同时形成核/壳结构的ZnO @ ZnS和Ag @ Ag ₂ S异质结而制成的。所得的四组分ZnO @ ZnS / Ag @ Ag ₂ S多结光催化剂显示出高的析氢活性（140.3μmolg ^-1）在5 h的模拟太阳光照射下，远远超过了裸露的ZnO（30.8μmolg ^-1），ZnO @ ZnS（92.8μmolg ^-1）和ZnO / Ag（45.1μmolg ^-1）。增强的光催化活性可归因于Z方案和II型核/壳异质结形成的协同效应，有利于光吸收和复合物中光生电子-空穴对的分离。这项工作为制造用于高效太阳能水分解的多组分异质结构提供了一种简便，可控制的方法。

更新日期：2018-10-10

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