LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions
LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions
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DOI：
10.1002/admi.201900516
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发表时间：
2019-06
影响因子：
5.4
通讯作者：
Samuel R. Anderson;A. O’Mullane;E. Della Gaspera;R. Ramanathan;V. Bansal
中科院分区：
文献类型：
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作者：
Samuel R. Anderson;A. O’Mullane;E. Della Gaspera;R. Ramanathan;V. Bansal
报道了一种简单的基于电替代（GR）反应的策略来创建用于光还原催化的铜基纤维织物。结果表明，纳米结构的Cu@Fabric可以很容易地通过自发的无电过程转化为纳米结构的Cu-Au@Fabric和Cu-Ag@Fabric，该过程包括简单地将铜织物暴露于金和银离子的水溶液。棉织物的纳米级层次有序性与其高孔隙率和润湿性相结合，使其成为催化剂回收和可重复使用的出色载体。在容易获得的Cu上沉积极少量的昂贵贵金属不仅降低了总催化剂成本，而且通过最小化Cu氧化在改善催化剂稳定性和在几个循环中的可重复使用性方面起着重要作用。Cu、Au和Ag的局域表面等离子体共振（LSPR）性质的协同效应使这些纳米纤维成为高活性的可见光光催化剂。光催化活性的机理研究提供了关于在催化剂/反应物界面处发生的电子转移过程的深入信息，揭示了电子转移作为限速步骤，这可以在可见光光照条件下克服。这些结果增强了对LSPR诱导的纳米结构的理解，为设计用于各种应用的多功能织物提供了新的潜力。
A simple galvanic replacement (GR) reaction‐based strategy to create copper‐based bimetallic fabrics for photoreductive catalysis is reported. It is shown that a nanostructured Cu@Fabric can be easily converted into bimetallic Cu‐Au@Fabric and Cu‐Ag@Fabric through a spontaneous electroless process that involves simple exposure of copper fabrics to the aqueous solutions of gold and silver ions. The nanoscale hierarchical ordering of cotton fabrics combined with their high porosity and wettability make them outstanding supports for catalyst recovery and reusability. The deposition of miniscule quantities of expensive noble metals on readily available Cu not only reduces the overall catalyst cost, but also plays a major role in improving the catalyst stability and reusability over several cycles through minimizing Cu oxidation. The synergistic effects of the localized surface plasmon resonance (LSPR) properties of Cu, Au, and Ag allow these bimetallic fabrics into highly active visible light photocatalysts. Mechanistic investigation of the photocatalytic activity provides in‐depth information on the electron transfer processes occurring at the catalyst/ reactant interface, revealing electron transport as the rate‐limiting step, which could be overcome under visible light photoillumination conditions. The outcomes enhance the understanding of template‐supported bimetallic nanostructures for LSPR‐induced photocatalysis applications, offering new potential to design multifunctional fabrics for various applications.