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Material Sciences 2021
金属铋修饰的P25光催化产氢活性研究
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Abstract:
本文采用两步法制备得到不同质量比的Bi/P25 (商业TiO2)复合纳米催化剂。所得复合光催化剂表现出明显优于P25的光催化产氢性能。其中，质量分数为5 wt%的样品表现出最好的光催化活性。当牺牲剂为20 vol%的甲醇时，其4小时的产氢速率可达460 μmol？g？1？h？1，是未修饰P25的8倍。光电性能测试结果表明，金属Bi的引入能有效地提升载流子的迁移速率与光生电子和空穴的分离效率，降低电子和空穴的复合能力，从而提升光催化活性。此外，在光催化过程中金属铋也可以作为光生电子受体，为反应提供更多的析氢活性位点，进而促进H2的产生。
In this work, Bi/P25 (Commercial TiO2) nanocomposites with different mass ratios of Bi were prepared by two-step method. The obtained composites were used as photocatalyst for hydrogen evolution. With 20 vol% methanol as sacrifice reagent, Bi/P25 nanocomposites with mass ratio of 5 wt% can achieve 460 μmol？g？1？h？1 in 4 hours under simulated solar light illumination, which was 8 times higher than that of unmodified P25. The photoelectric performance test indicated that the introduction of metallic Bi can effectively improve the mobility and separation rate of the photo-generated carriers. In addition, metallic bismuth can act as photoelectron acceptor in the reaction system and provide more active sites for hydrogen evolution, thus promoting the production of H2.
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