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首页> 外文期刊>RSC Advances >A galvanic replacement reaction to synthesise metal/ZnO heterostructured films on zinc substrates for enhanced photocatalytic performance
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A galvanic replacement reaction to synthesise metal/ZnO heterostructured films on zinc substrates for enhanced photocatalytic performance

机译：在锌基材上合成金属/ ZnO异质结构薄膜的电催化反应，提高光催化性能

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The construction of non-precious transition metal/ZnO heterostructured films is being considered as an effective way to promote photocatalytic efficiency for their practical applications. Herein, a general and facile approach is reported for the first time to synthesize a series of M/ZnO (M = Cu, Cd, Co) heterostructured films on Zn substrate based on a simple one-step galvanic replacement reaction between Zn substrate and metal salt solution under hydrothermal condition without the use of any other reactants or additives. Zn substrate functions as not only the reducing agent, but also the source of ZnO to simplify the recipes and facilitate the synthetic procedures. Among M/ZnO heterostructured films, due to their matching degree of phase and cell parameters, two kinds can be prepared, including Cu/ZnO and Co/ZnO heterostructures with metal nanoparticles ( e.g. Cu and Co) anchored on ZnO nanorods and Cd/ZnO heterostructures assembled by Cd nanorod core and ZnO nanorod branches. A pine tree-like Cu/ZnO heterostructured film is chosen as a representative to demonstrate the facility and effectiveness of the strategy, which exhibits higher photocatalytic efficiency towards visible light irradiation than bare ZnO nanospindles. The enhanced photocatalytic activities may be mainly attributed to the surface plasmon absorption of Cu nanoparticles in the visible region, which increases the optical absorption of the Cu/ZnO heterostructures and promotes the transfer of photo-induced electrons from Cu nanoparticles into ZnO nanorods. This general method can be further explored to guide the design of metal/metal oxide heterostructured films on other substrates, such as Cu, Ni and Ti foils.
机译：非珍贵过渡金属/ ZnO异质结构薄膜的构建被认为是促进光催化效率的实际应用的有效途径。在此，首次报告了一般和容易的方法，以基于Zn衬底和金属之间的简单一步电流置换反应，在Zn衬底上合成一系列M / ZnO（M = Cd，Co）异质化薄膜水热条件下的盐溶液，不使用任何其他反应物或添加剂。 Zn基板不仅起还原剂，而且是ZnO的来源，用于简化食谱并促进合成程序。在M / ZnO异质结构薄膜中，由于它们的相和电池参数匹配，可以制备两种，包括Cu / ZnO和Co / ZnO异质结构，其中金属纳米粒子（例如Cu和Co）锚定在ZnO纳米棒和Cd / ZnO上由CD纳米芯芯和ZnO纳米棒分支组装的异质结构。选择一种松树状Cu / ZnO异质结构薄膜作为代表，以证明该策略的设施和有效性，这表现出较高的光催化效率朝向可见光照射的光催化效率而不是裸ZnO纳米绦​​虫。增强的光催化活性可以主要归因于可见区域中Cu纳米颗粒的表面等离子体吸收，这增加了Cu / ZnO异质结构的光学吸收，并促进了从Cu纳米粒子的光诱导电子转移到ZnO纳米棒中。可以进一步探索该一般方法以指导在其他基材上的金属/金属氧化物异质结构薄膜的设计，例如Cu，Ni和Ti箔。

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