Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology , Dalian 116024, China.
Langmuir. 2017 May 9;33(18):4452-4460. doi: 10.1021/acs.langmuir.7b00995. Epub 2017 Apr 24.
To improve the photocatalytic activity and photostability of ZnO, a novel cable-like Pt/ZnO@C composite is successfully fabricated by coating a 3-5 nm hydrothermal carbon (HTC) layer on the surface of the Pt nanoparticle-modified ZnO nanowire. After investigating the optical and photoelectrochemical performance in detail, it is found that the Pt/ZnO@C nanocable shows a dual-enhanced migration efficiency for the photoinduced surface electrons, distributing to the modified Pt nanoparticles and the coated HTC layer. Consequently, the Pt/ZnO@C nanocable exhibits a dual-enhanced photocatalytic activity for the degradation of various organic pollutants under the UV light irradiation. The coated HTC layer can also play a role in suspending the ZnO photocorrosion and significantly improves the photostability of the Pt/ZnO@C nanocable. Furthermore, the photocatalysis and photocorrosion mechanism of the Pt/ZnO@C nanocable is proposed and discussed in terms of its structural feature and photoelectrochemical property. The resultant Pt/ZnO@C nanocable with the unique HTC layer-coated structure will probably stimulate to design and synthesize more HTC-hybridized composites with a superior photocatalytic or photoelectrocatalytic performance.
为了提高 ZnO 的光催化活性和光稳定性，通过在 Pt 纳米颗粒修饰的 ZnO 纳米线表面涂覆 3-5nm 的水热碳（HTC）层，成功制备了一种新型的电缆状 Pt/ZnO@C 复合材料。在详细研究了其光学和光电化学性能后发现，Pt/ZnO@C 纳米电缆表现出光致表面电子的双增强迁移效率，分布在修饰的 Pt 纳米颗粒和涂覆的 HTC 层上。因此，Pt/ZnO@C 纳米电缆在紫外光照射下对各种有机污染物的降解表现出双增强的光催化活性。涂覆的 HTC 层还可以起到悬浮 ZnO 光腐蚀的作用，显著提高了 Pt/ZnO@C 纳米电缆的光稳定性。此外，根据其结构特征和光电化学性质，提出并讨论了 Pt/ZnO@C 纳米电缆的光催化和光腐蚀机理。具有独特 HTC 层涂覆结构的 Pt/ZnO@C 纳米电缆可能会激发更多具有优异光催化或光电催化性能的 HTC 杂化复合材料的设计和合成。
