Fe^(3+) 偶联的Eosin-Y染料敏化Pt/ZnO可见光制氢活性

Study on visible light hydrogen evolution activity ofFe^(3+) coupling eosin-y dye sensitized Pt/ZnO

以浸渍法制备了Eosin-Y染料敏化的EY-Pt/ZnO和Fe^(3+)偶联的EY-Fe-Pt/ZnO光催化剂。利用XRD、UV-Vis漫反射光谱、FTIR光谱、XPS能谱和电化学方法对催化剂进行了表征。以三甲胺(TMA)为电子给体,考察了催化剂在可见光(λ≥420 nm)照射下的光催化分解水制氢活性。结果表明:Eosin-Y染料的敏化使Pt/ZnO对可见光有较强的吸收和放氢活性。Fe^(3+)离子偶联后提高了Eosin-Y染料在Pt/ZnO光催化剂表面的吸附,促进了光生电子-空穴的分离,使催化剂可见光制氢活性和稳定性得以提高。最佳条件下,经过8 h光照,Fe^(3+)离子偶联的催化剂EY(0.05)-Fe(0.003)-Pt/ZnO的制氢活性比单一用Eosin-Y染料敏化的催化剂EY(0.05)-Pt/ZnO的制氢活性提高了47%。

EY-Pt/ZnO and EY-Fe-Pt/ZnO photocatalysts were prepared by the impregnation method.The catalysts were characterized by the X-ray diffraction,UV-Vis diffuse reflectance spectrum,FTIR spectrum,XPS analysis and the electrochemistry methods.Using trimethylamine as the electron donor,the photocatalytic activity of the catalyst for water splitting to produce hydrogen was investigated under visible light(λ≥420 nm).It was found that Pt/ZnO has a strong absorption of visible light and high hydrogen evolution activity by Eosin Y dye sensitization.Fe^(3+)ion coupling improves the adsorption of Eosin-Y dye on the surface of the Pt/ZnO photocatalyst,promotes the separation of photogenerated electrons and holes,and improves the visible light hydrogen evolution activity and stability of the catalyst.Under the optimal conditions and after 8 h illumination,the hydrogen evolution activity of the Fe^(3+)ion-coupled catalyst EY(0.05)-Fe(0.003)-Pt/ZnO is 47%higher than that of the catalyst EY(0.05)-Pt/ZnO sensitized with Eosin-Y dye only.