Efficient Photocatalytic Hydrogen Generation from Ni Nanoparticle Decorated CdS Nanosheets
Efficient Photocatalytic Hydrogen Generation from Ni Nanoparticle Decorated CdS Nanosheets
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DOI：
10.1021/acscatal.5b01812
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发表时间：
2015-10
期刊：
影响因子：
12.9
通讯作者：
M. Zhukovskyi;Pornthip Tongying;H. Yashan;Yuanxing Wang;M. Kuno
中科院分区：
文献类型：
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作者：
M. Zhukovskyi;Pornthip Tongying;H. Yashan;Yuanxing Wang;M. Kuno
通过二乙基二硫代氨基甲酸镉在十八碳烯中的热分解，获得了高质量、厚度可控的CdS纳米片。已制成离散厚度为1.50、1.80和2.16 nm的系综，其相应的横向尺寸为90 nm × 20 nm。这些后者的值使1-3纳米的NS最大的二维CdS样品，迄今为止使用胶体化学。通过将Ni光沉积到平均粒径为6 nm的NS上，制备了相关的Ni纳米颗粒修饰的对应物。随后的光催化制氢测量比较了CdS NS的性能与它们的Ni NP修饰的对应物在水/乙醇混合物。已经看到的表观量子产率高达25%的Ni NP装饰的NS与瞬态产率高达64%，在第一个2小时的照射。系综飞秒瞬态差分吸收光谱的结果揭示了这种高效率的起源。
High-quality, thickness-controlled CdS nanosheets (NSs) have been obtained through the thermal decomposition of cadmium diethyldithiocarbamate in octadecene. Ensembles with discrete thicknesses of 1.50, 1.80, and 2.16 nm have been made with corresponding lateral dimensions on the order of 90 nm × 20 nm. These latter values make the 1–3 nm NSs the largest 2D CdS specimens made to date using colloidal chemistry. Associated Ni nanoparticle decorated counterparts have been made through the photodeposition of Ni onto NSs with an average nanoparticle diameter of 6 nm. Subsequent photocatalytic hydrogen generation measurements have compared the performance of CdS NSs with that of their Ni NP decorated counterparts in water/ethanol mixtures. Apparent quantum yields as large as 25% have been seen for Ni NP decorated NSs with transient yields as large as 64% within the first 2 h of irradiation. Results from ensemble femtosecond transient differential absorption spectroscopy reveal that the origin of this high effic...