Sun Yuntao, Wang Can, Qin Shengyao, Pan Fengda, Li Yongyan, Wang Zhifeng, Qin Chunling
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin 300401, China.
Nanomaterials (Basel). 2022 Aug 18;12(16):2850. doi: 10.3390/nano12162850.
Designing a novel photocatalytic composite for the efficient degradation of organic dyes remains a serious challenge. Herein, the multi-layered CoO@NP-CuO photocatalyst with unique features, i.e., the self-supporting, hierarchical porous network as well as the construction of heterojunction between CoO and CuO, are synthesized by dealloying-electrodeposition and subsequent thermal treatment techniques. It is found that the interwoven ultrathin CoO nanopetals evenly grow on the nanoporous CuO network (CoO@NP-CuO). The three-dimensional (3D) hierarchical porous structure for the catalyst provides more surface area to act as active sites and facilitates the absorption of visible light in the photodegradation reaction. Compared with the commercial CuO and CoO powders, the newly designed CoO@NP-CuO composite exhibits superior photodegradation performance for RhB. The enhanced performance is mainly due to the construction of heterojunction of CoO/CuO, greatly promoting the efficient carrier separation for photocatalysis. Furthermore, the possible photocatalytic mechanism is analyzed in detail. This work provides a promising strategy for the fabrication of a new controllable heterojunction to improve photocatalytic activity.
设计一种用于高效降解有机染料的新型光催化复合材料仍然是一项严峻的挑战。在此，通过脱合金电沉积和后续热处理技术合成了具有独特特性的多层CoO@NP-CuO光催化剂，即自支撑的分级多孔网络以及CoO和CuO之间异质结的构建。研究发现，交织的超薄CoO纳米花瓣均匀地生长在纳米多孔CuO网络（CoO@NP-CuO）上。催化剂的三维（3D）分级多孔结构提供了更多的表面积作为活性位点，并促进了光降解反应中可见光的吸收。与商业CuO和CoO粉末相比，新设计的CoO@NP-CuO复合材料对RhB表现出优异的光降解性能。性能增强主要归因于CoO/CuO异质结的构建，极大地促进了光催化中载流子的有效分离。此外，还详细分析了可能的光催化机理。这项工作为制造新型可控异质结以提高光催化活性提供了一种有前景的策略。
