Cu_(3)P修饰改性CdS光催化析氢性能研究

Study on Cu_(3)P as a Cocatalyst to Improve the Photo-catalytic Hydrogen Evolution Performance of CdS

助催化剂的负载是提高催化剂光生电子-空穴对分离效率的有效策略之一。通过水热法成功得到了CdS纳米棒,基于形貌调控策略将不同质量的Cu_(3)P纳米颗粒通过溶剂热法与CdS纳米棒成功复合。两种材料复合之后大大降低了Cu_(3)P的团聚程度。一系列实验表明,Cu_(3)P颗粒的引入显著提高了CdS的光捕获能力,这为激发CdS产生更多的光生载流子提供了条件。基于实验结果提出了可能的光催化裂解水析氢的机理,Cu_(3)P的有效负载为CdS提供了表面反应活性中心,进一步抑制了CdS光生载流子的复合,[JP+2]加快了光催化析氢反应,快速地将生成的氢气释放。该工作为改善CdS光催化析氢活性提供了合理的手段和策略。

The loading of cocatalysts is one of the effective strategies to improve the separation efficiency of photogenerated carriers in catalysts.In this work,CdS nanorods were successfully synthesized through a hydrothermal method,and then Cu_(3)P nanoparticles of different masses were successfully coupled with CdS nanorods by a solvothermal method based on morphology regulation strategy.The composite of the two materials greatly reduced the degree of Cu_(3)P agglomeration.A series of experiments showed that the introduction of Cu_(3)P particles significantly improved the light capture ability of CdS,which provided the conditions for stimulating CdS to generate more photocarriers.A possible mechanism for the photocatalytic splitting of water for hydrogen evolution was proposed based on the experimental results.The effective loading of Cu_(3)P provides surface reactivity for CdS and further inhibits the recombination of CdS photogenerated carriers,which accelerates the process of photocatalytic hydrogen evolution.This work provides a reasonable means and strategy for improving the photocatalytic hydrogen evolution activity of CdS.