Abstract A free-standing Cu2O/CuO@nanoporous copper/bulk metallic glass (Cu2O/CuO@NPC/BMG) composite rod with a multimodal hierarchical porous structure has been successfully prepared by a facile two-step synthesis strategy consisting of dealloying and anodizing. The NPC/BMG composite is first fabricated by dealloying of Cu50Zr45Al5 BMG rod. Then the ultrafine Cu2O/CuO nanosheet arrays are synthesized by anodizing of the NPC/BMG rod followed by heat treatment. The as-obtained Cu2O/CuO@NPC/BMG composite possesses a multimodal hierarchical porous structure comprising interconnected pores ranging from micro, meso to macro sizes. It is worth pointing out that there are several “barren lands” without nanosheets grown on the surface of the composite. Further analyses indicate that the microstructures of substrate materials not only dominate the sizes of Cu2O/CuO sheets, but also influence the nucleation and growth of Cu2O/CuO sheets. Meanwhile, the possible formation mechanism of the Cu2O/CuO nanosheets is proposed. Accordingly, the Cu2O/CuO@NPC/BMG composite shows remarkably high photocatalytic degradation performance and excellent cycling stability for RhB due to the multimodal hierarchical porous structure, ultrafine Cu2O/CuO nanosheets in the entire NPC and the integration design strategy.

中文翻译：

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与NPC/BMG复合棒集成的超细Cu2O/CuO纳米片阵列用于光催化降解

摘要 通过脱合金和阳极氧化两步合成策略，成功制备了具有多峰分层多孔结构的独立式Cu2O/CuO@纳米多孔铜/块状金属玻璃（Cu2O/CuO@NPC/BMG）复合棒。NPC/BMG 复合材料首先通过对 Cu50Zr45Al5 BMG 棒进行脱合金制备。然后通过对 NPC/BMG 棒进行阳极氧化和热处理来合成超细 Cu2O/CuO 纳米片阵列。所获得的 Cu2O/CuO@NPC/BMG 复合材料具有多模态分层多孔结构，包括从微观、中观到宏观尺寸的互连孔隙。值得指出的是，复合材料表面有几处没有纳米片生长的“荒地”。进一步的分析表明，衬底材料的微观结构不仅决定了 Cu2O/CuO 片的尺寸，而且影响了 Cu2O/CuO 片的形核和生长。同时，提出了Cu2O/CuO纳米片的可能形成机制。因此，Cu2O/CuO@NPC/BMG 复合材料由于多峰分级多孔结构、整个 NPC 中的超细 Cu2O/CuO 纳米片和集成设计策略，对 RhB 显示出非常高的光催化降解性能和优异的循环稳定性。