摘要
采用机械混合法制备了红磷-Ti O_2(P-Ti O_2)复合光催化剂,并对催化剂进行了X射线衍射、紫外-可见光漫反射、透射电子显微镜表征。以甲醇为牺牲试剂,铂为助催化剂,在可见光辐照下对P-Ti O_2复合光催化剂进行了光催化分解水产氢性能测试,并提出了红磷和Ti O_2可能的作用机理。研究结果表明:红磷和Ti O_2复合后,光催化剂的产氢性能显著提高,当P-Ti O_2中Ti O_2的质量分数为5%时,光催化剂的产氢性能最高,产氢速率可达到52.6μmol/(h·g),为纯红磷样品的2.54倍;红磷和Ti O_2复合后在其接触面上形成了p-n结,并通过p-n结实现了光生电子从红磷到Ti O_2的传递,从而与Pt发生还原反应产生氢气。
Red phosphorus-TiO2 composites photocatalysts were prepared by a mechanical mixture method and characterized by X-ray diffraction, UV-Vis diffuse reflectance spectra, transmission electron microscopy. The photocatalytic activities of the P-TiO2 composites for H2 evolution were evaluated under visible light irradiation with methanol as sacrificial reagent and Pt as co-catalyst. A possible mechanism for methanol/water decomposition over P-TiO2 is proposed.The results show that the photocatalytic H2 production performance of P-TiO2 composites can be significantly improved. The highest H2 evolution rate was 52.6 μmol/（h ·g） under visible light when the ratio of TiO2 reacheed 5 percent, it is about 2.54 times higher than that of pure red phosphorus sample. The p-n heterojunction can be formed within the interracial surface between red phorsphorus and TiO2, where photogenerated dectrons effectively transferred from red phorsphorus to TiO2, thereby promoting the water reduction for H2 evolution in the presence of Pt.
出处
《可再生能源》
CAS
北大核心
2016年第2期274-278,共5页
Renewable Energy Resources
基金
国家自然科学基金(21376102)
广东省自然科学基金(S2013010012199)
关键词
光催化
红磷
TIO2
可见光
产氢性能
photoeatalysis
red phosphorus
TiO2
visible light
hydrogen generation perfor-mance
