【摘要】 采用机械混合法制备了红磷-Ti O₂（P-Ti O₂）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 O₂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 O₂可能的作用机理。研究结果表明:红磷和Ti O₂复合后,光催化剂的产氢性能显著提高,当P-Ti O₂中Ti O₂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 O₂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 O₂的传递,从而与Pt发生还原反应产生氢气。更多还原

【Abstract】 Red phosphorus-Ti O₂ 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-Ti O₂ 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-Ti O₂ is proposed.The results show that the photocatalytic H₂ production performance of P-Ti O₂ composites can be significantly improved. The highest H₂ evolution rate was 52.6 μmol/（h·g） under visible light when the ratio of Ti O₂ reacheed 5percent,it is about 2.54 times higher than that of pure red phosphorus sample. The p-n heterojunction can be formed within the interfacial surface between red phorsphorus and Ti O₂, where photogenerated electrons effectively transferred from red phorsphorus to Ti O₂, thereby promoting the water reduction for H₂ evolution in the presence of Pt.更多还原