Dong Chunyang, Hu Songchang, Xing Mingyang, Zhang Jinlong
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
Nanotechnology. 2018 Apr 2;29(15):154005. doi: 10.1088/1361-6528/aaad44.
A spatially separated, dual co-catalyst photocatalytic system was constructed by the stepwise introduction of RuO and Au nanoparticles (NPs) at the internal and external surfaces of a three dimensional, hierarchically ordered TiO-SiO (HTSO) framework (the final photocatalyst was denoted as Au/HRTSO). Characterization by HR-TEM, EDS-mapping, XRD and XPS confirmed the existence and spatially separated locations of Au and RuO. In CO photocatalytic reduction (COPR), Au/HRTSO (0.8%) shows the optimal performance in both the activity and selectivity towards CH; the CH yield is almost twice that of the singular Au/HTSO or HRTSO (0.8%, weight percentage of RuO) counterparts. Generally, Au NPs at the external surface act as electron trapping agents and RuO NPs at the inner surface act as hole collectors. This advanced spatial configuration could promote charge separation and transfer efficiency, leading to enhanced COPR performance in both the yield and selectivity toward CH under simulated solar light irradiation.
通过在三维分级有序的TiO-SiO（HTSO）框架的内表面和外表面逐步引入RuO和金纳米颗粒（NPs），构建了一种空间分离的双助催化剂光催化体系（最终的光催化剂记为Au/HRTSO）。高分辨透射电子显微镜（HR-TEM）、能谱映射（EDS-mapping）、X射线衍射（XRD）和X射线光电子能谱（XPS）表征证实了Au和RuO的存在及其空间分离的位置。在CO光催化还原（COPR）中，Au/HRTSO（0.8%）在对CH的活性和选择性方面均表现出最佳性能；CH产率几乎是单一的Au/HTSO或HRTSO（0.8%，RuO的重量百分比）对应物的两倍。一般来说，外表面的金纳米颗粒充当电子捕获剂，内表面的RuO纳米颗粒充当空穴收集剂。这种先进的空间构型可以提高电荷分离和转移效率，从而在模拟太阳光照射下提高COPR对CH的产率和选择性方面的性能。
