α-Ag₂WO₄ clusters comprising an assembly of nanorods were controllably fabricated via a simple ion exchange method at room temperature. The phase, morphology, microstructure, optical absorption, photoluminescence, photoelectrochemical properties and photocatalytic behavior of the products were systematically explored. α-Ag₂WO₄ nanorod-clusters of high purity are achieved at a medium pH of 9.8 provided by adjusting the molar ratio of AgNO₃ and Na₂WO₄ to 1 : 4, and the sample exhibits superior photocatalytic activity for the degradation of organic pollutants. Its rate constant k is as high as 21.8 fold in comparison with that of the sample obtained with stoichiometric raw materials at a ratio of 1 : 0.5. The boosted photoactivity of α-Ag₂WO₄ clusters can be well accounted for by the broadened light harvesting and accelerated charge separation, which are proved by the red-shifted light absorption, higher photocurrent and a smaller Nyquist impedance radius. Based on the detected active species and the band edge positions, a possible migration mechanism of photoinduced e⁻/h⁺ pairs on the surface of α-Ag₂WO₄ clusters was proposed. This work provides some new insights into the rational design and synthesis of photocatalysts with a deep understanding of the relationship among the experimental parameters, the microstructure and properties to acquire a more desired photoactivity.

中文翻译：

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的可控制备α银₂ WO ₄纳米棒簇具有优良模拟太阳光的光催化性能†

α银₂ WO ₄，其包括装配纳米棒簇可控地制造通过在室温下的简单的离子交换方法。系统地研究了产物的相，形貌，微观结构，光吸收，光致发光，光电化学性质和光催化性能。α银₂ WO ₄的高纯度的纳米棒簇以通过调整硝酸银的摩尔比提供为9.8的培养基pH达到₃和Na ₂ WO ₄至1：4，并且所述样品表现出优良的光催化活性为的降解有机污染物。其速率常数k与用化学计量的原料以1∶0.5的比率获得的样品相比，其高21.8倍。α-Ag的光活性升压₂ WO ₄集群可以通过加宽光捕获和加速的电荷分离，这是由证明良好占红移光吸收，光电流更高和更小的奈奎斯特阻抗半径。基于检测到的活性物质和带边缘位置，光诱导E的可能的迁移机制^- / H ⁺的表面上对α银₂ WO ₄提出了集群。这项工作提供了对光催化剂的合理设计和合成的一些新见解，对实验参数，微观结构和性能之间的关系有了深入的了解，从而获得了更理想的光活性。