Preparation of crystallized mesoporous CdS/Ta2O5 composite assisted by silica reinforcement for visible light photocatalytic hydrogen evolution
Preparation of crystallized mesoporous CdS/Ta2O5 composite assisted by silica reinforcement for visible light photocatalytic hydrogen evolution
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DOI：
10.1016/j.catcom.2012.03.037
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
Leilei Xu;W. Shi;Jianguo Guan
中科院分区：
文献类型：
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作者：
Leilei Xu;W. Shi;Jianguo Guan
采用蒸发诱导自组装技术，在硅氧烷试剂和S2−离子交换存在下，850℃下结晶制备了介孔CdS/ ta2o5光催化剂。所制备的复合材料具有较大的比表面积和较薄的晶化孔壁，因此具有明显增强的可见光析氢活性，是非晶化介孔CdS/Ta2O5的两倍，是直接晶化CdS/Ta2O5的近4倍。这种增强归因于高结晶度和精心制作的介观结构的协同效应所产生的光生电荷的有效利用。
A crystallized mesoporous CdS/Ta2O5photocatalyst was prepared using an evaporation-induced self-assembly technology followed by crystallization at 850°C in the presence of siloxane reagents and S2−ion-exchange. The as-prepared composite possesses large specific surface areas and thin crystallized pore walls, and thus exhibits a significantly enhanced visible light photocatalytic activity for hydrogen evolution, which is twice as large as that of the amorphous mesoporous CdS/Ta2O5and is nearly 4 times larger than that of the directly crystallized CdS/Ta2O5. This enhancement is attributed to the efficient utilization of photogenerated charges resulting from the synergistic effect of high crystallinity and well-fabricated mesostructures.