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Photocatalytic H2 production over inverse opal TiO2 catalysts
Catalysis Today ( IF 5.3 ) Pub Date : 2017-12-13 , DOI: 10.1016/j.cattod.2017.12.011
Roberto Fiorenza , Marianna Bellardita , Salvatore Scirè , Leonardo Palmisano

The influence of BiVO4 and CuO on the chemico-physical properties of TiO2-based systems is reported. The performances of these systems were investigated in the photocatalytic H2 production both under UV and solar light irradiation. The characterization data pointed out that the obtained TiO2 samples have highly porous inverse opal structures with interconnected macropores. Inverse opal TiO2 exhibited higher activity in the H2 production than the commercial TiO2 due to the peculiar porosity that allows photons to enter inside the photocatalyst. A further improvement in terms of photoactivity was verified by addition of increasing amounts of BiVO4. On the contrary a small CuO content was found to be the optimal one for the inverse opal TiO2-CuO composites. In fact, due to surface segregation effects, a higher amount of CuO can partially keep the light radiation away from the TiO2 surface active sites, thus decreasing drastically the absorption of photons. The combination of the benefits of the highly ordered porous TiO2 structure and the presence of BiVO4 or small amounts of CuO can represent a promising strategy towards efficient photocatalytic H2 production.



中文翻译:

反相蛋白石TiO 2催化剂上的光催化H 2产生

报道了BiVO 4和CuO对TiO 2基体系化学-物理性质的影响。在紫外线和太阳光照射下,在光催化H 2的生产中研究了这些系统的性能。表征数据指出,所获得的TiO 2样品具有具有相互连接的大孔的高度多孔的反蛋白石结构。反蛋白石的TiO 2展出在H更高的活性2生产比市售的TiO 2,由于特有的孔隙率,其允许光子光催化剂内部进入。通过添加增加量的BiVO验证了光活性方面的进一步改善4。相反,发现少量的CuO含量是反蛋白石TiO 2 -CuO复合材料的最佳含量。实际上,由于表面偏析效应,较高量的CuO可以部分地使光辐射远离TiO 2表面活性部位,从而大大降低了光子的吸收。高度有序的多孔TiO 2结构的好处与BiVO 4或少量CuO的存在相结合,可以代表一种有效的光催化H 2生产的有前途的策略。

更新日期:2017-12-13
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