To improve organic pollutant degradation ability, this work aims at designing a novel porous Cu-Ag bimetal hybrid with unique architecture, fertile porosity as well as Schottky junction. Herein, a free-standing hybrid with Ag nanoparticles modified CuO (x = 1, 2) nanowires in-situ grown on the nanoporous Cu-Ag bimetal network (Ag/CuO@NP-CuAg) was successfully synthesized by dealloying and then anodizing process. Compared with monometallic CuO nanowires integrated with nanoporous Cu substrate (CuO@NPC), the Ag/CuO@NP-CuAg hybrids with the Ag/CuO Schottky junction and SPR effect of Ag nanoparticles, are favorable to accelerate the transportation of photo-generated carriers and avoid the recombination of electrons (e) and holes (h), thus exhibiting the enhanced photocatalytic performance for RhB. Such remarkable performance is also contributed to the multimodal hierarchical porous structure and the integration design strategy. Moreover, by density functional theory (DFT) calculation, a typical Z-scheme mechanism is proposed to better understand the photocatalytic degradation process. The formation mechanism of the Ag/CuO nanowires is also investigated.

中文翻译：

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用于高光催化降解的分级多孔 Ag/CuxO (x = 1, 2) 纳米线杂化物的合成和机理


为了提高有机污染物的降解能力，本工作旨在设计一种具有独特结构、丰富孔隙率和肖特基结的新型多孔铜银双金属杂化物。在此，通过脱合金和阳极氧化过程成功合成了在纳米多孔 Cu-Ag 双金属网络上原位生长的 Ag 纳米颗粒改性 CuO (x = 1, 2) 纳米线的独立杂化物 (Ag/CuO@NP-CuAg) 。与集成有纳米多孔Cu基底的单金属CuO纳米线（CuO@NPC）相比，Ag/CuO@NP-CuAg杂化物具有Ag/CuO肖特基结和Ag纳米粒子的SPR效应，有利于加速光生载流子的传输并避免电子（e）和空穴（h）的复合，从而表现出增强的RhB光催化性能。如此出色的性能也归功于多模态分层多孔结构和集成设计策略。此外，通过密度泛函理论（DFT）计算，提出了典型的Z型机制，以更好地理解光催化降解过程。还研究了Ag/CuO纳米线的形成机制。