超薄骨架有序介孔CdS/NiS的制备及光催化产氢性能

采用有序介孔氧化硅为硬模板, 通过纳米浇筑法制备了由螺旋骨架构建的有序介孔硫化镉(CdS)光 催化材料. 该光催化材料具有约5 nm厚的超薄骨架和大的比表面积(238 m²/g), 能有效缩短光催化反应中 光生电荷迁移到表面进行反应的距离并同时提供更多的反应活性位点, 从而增强光催化性能. 通过原位化学沉积法将不同量的助催化剂硫化镍(NiS)沉积到有序介孔CdS表面, 得到了一系列超薄骨架有序介孔CdS/NiS复合光催化材料. 可见光照射下的光催化产氢活性测试结果表明, 负载适量NiS的有序介孔CdS具有显著增强的光催化产氢活性(3.84 mmol?h^-1?g^-1), 约为负载相同量NiS的普通商业化CdS材料(0.22 mmol?h^-1?g^-1)的17.5倍.

Ordered Mesoporous NiS-loaded CdS with Ultrathin Frameworks for Efficient Photocatalytic H2 Production

An ordered mesoporous cadmium sulfide（CdS） photocatalyst has been synthesized through the nanocasting method using ordered mesoporous silica as hard template. The resultant ordered mesoporous CdS photocatalyst is constructed with gyroid ultrathin frameworks of ca. 5 nm and possesses a large specific surface area of 238 m²/g， which could efficiently reduce the migration distance of photo-generated charges from bulk to surface in photocatalysis and provide more active sites for photocatalytic reaction， thus resulting an enhanced photocatalytic performance. Furthermore， nickel sulfide as a cocatalyst was loaded on the surface of ordered mesoporous CdS by the in?situ chemical deposition， resulting in a series of ordered mesoporous NiS-loaded CdS nanocomposite photocatalysts. Their photocatalytic performances for H₂ production in water were evalua-ted under visible light irradiation（λ≥420 nm） and a high photocatalytic H₂ evolution rate of 3.84 mmol?h^-1?g^-1 could be reached after loading an optimal amount of NiS， which is 17.5 times that（0.22 mmol?h^-1?g^-1） for commercial CdS after loading the same amount of NiS.