Highly efficient photocatalytic hydrogen generation by incorporating CdS into ZnCr-layered double hydroxide interlayer
Highly efficient photocatalytic hydrogen generation by incorporating CdS into ZnCr-layered double hydroxide interlayer
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DOI：
10.1039/c4ra11757c
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
Guohua Zhang;B. Lin;Weiwei Yang;Shaofeng Jiang;Qianru Yao;Yilin Chen;Bifen Gao
中科院分区：
文献类型：
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作者：
Guohua Zhang;B. Lin;Weiwei Yang;Shaofeng Jiang;Qianru Yao;Yilin Chen;Bifen Gao
通过剥离-重堆积法将CdS纳米粒子嵌入ZnCr-LDH纳米片层间，制备了CdS柱撑ZnCr-LDH纳米杂化材料。所得纳米杂化物显示出2.50 nm的层间距和具有86 m2 g-1比表面积的中孔织构。结果表明，在柱撑异质结构中，两组分之间存在较强的电子耦合，从而显著抑制了光生电子-空穴复合。所制备的纳米杂化物显示出显著增强的光催化活性。在可见光和紫外-可见光下，其放氢速率分别高达374 μmol h−1 g−1和2164 μmol h−1 g − 1，量子效率分别为42.6%和48.2%，远远上级其亲本ZnCr-LDH和CdS。目前的研究结果清楚地表明，自组装的CdS-LDHs是非常有效的合成新的LDHs基可见光驱动的光催化剂，具有高性能的析氢从水分解。
CdS-pillared ZnCr–LDH nanohybrid was prepared by incorporating CdS nanoparticles into the interlayer of ZnCr–LDH nanosheets via an exfoliation–restacking route. The resultant nanohybrid exhibits an interlayer spacing of 2.50 nm and a mesoporous texture with a specific surface area of 86 m2 g−1. It was revealed that there exists a strong electronic coupling between the two components in the pillared heterostructure, which remarkably suppresses the photogenerated electron–hole recombination. The as-prepared nanohybrid displayed significantly enhanced photocatalytic activity. Its H2-evolution rates were as high as 374 μmol h−1 g−1 with a quantum efficiency of 42.6% and 2164 μmol h−1 g−1 with a quantum efficiency of 48.2% under visible and UV-visible light, respectively, which were far superior to those of its parents ZnCr–LDH and CdS. The present findings clearly demonstrate that the self-assembly of CdS–LDHs is quite effective in synthesizing novel LDHs-based visible-light-driven photocatalysts with high performance in hydrogen evolution from water splitting.