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Mesoporous black TiO2 phase junction@Ni nanosheets: A highly integrated photocatalyst system
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jtice.2020.09.009
Wei Li , Lin OuYang , Yuxia Tang , Zhaogang Teng , Xiaodan Su , Jiang Wu

Solar fuels production by using TiO2 nanomaterials has attracted much attention to overcome the energy and environmental crisis. However, it is a big challenge to utilize the visible light, promote charge separation and surface reaction, and efficiently recover nanosized TiO2 photocatalysts without secondary contamination. Here, Ni nanosheets as the non-noble metal co-catalysts are coated on the surface of mesoporous black TiO2 phase junction microspheres (Ni/b–TiO2) for highly efficient H2 evolution. The black TiO2 phase junction core can efficiently harvest the visible light and greatly facilitate the charge transfer. The Ni nanosheet shell can not only serve as a highly efficient collaborative co-catalyst to promote the separation and transfer of photogenerated charge carriers, but also enhance the visible light absorption and improve the utilization ratio of sunlight. The obtained Ni/b–TiO2 exhibits a high hydrogen evolution rate of 166.2 µmol h-1 g-1 under simulated sunlight, which is much higher than that of pristine mesoporous black TiO2 microspheres (80.5 μmol h-1 g-1). More importantly, the obtained photocatalysts can be easily separated through magnetic separation. Such a structure design may provide new insights for fabricating low-cost bifunctional photocatalysts with high-performance.



中文翻译:

介孔黑色TiO2相结@Ni纳米片:高度集成的光催化剂体系

利用TiO 2纳米材料生产太阳能燃料已引起人们的广泛关注,以克服能源和环境危机。然而,利用可见光,促进电荷分离和表面反应以及有效地回收纳米TiO 2光催化剂而没有二次污染是一个巨大的挑战。在这里,作为非贵金属助催化剂的Ni纳米片被涂覆在介孔黑色TiO 2相结微球(Ni / b-TiO 2)的表面上,以高效地释放H 2。黑色TiO 2相结核可以有效地收集可见光,极大地促进了电荷转移。Ni纳米片壳不仅可以作为高效的协同助催化剂,促进光生载流子的分离和转移,而且可以提高可见光吸收率,提高太阳光的利用率。所获得的Ni / b-TiO 2在模拟阳光下具有很高的析氢速率,为166.2 µmol h -1  g -1,远高于原始的中孔黑色TiO 2微球(80.5μmolh -1  g -1)。)。更重要的是,可以通过磁分离容易地分离所获得的光催化剂。这样的结构设计可以为制造具有高性能的低成本双功能光催化剂提供新的见解。

更新日期:2020-10-16
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