Sonochemistry synthesis of Bi2S3/CdS heterostructure with enhanced performance for photocatalytic hydrogen evolution
Sonochemistry synthesis of Bi2S3/CdS heterostructure with enhanced performance for photocatalytic hydrogen evolution
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DOI：
10.1016/j.ijhydene.2014.04.140
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发表时间：
2014-09
影响因子：
7.2
通讯作者：
Hao Linxing;Gang Chen;Yaoguang Yu;Yansong Zhou;Zhonghui Han;Yue Liu
中科院分区：
文献类型：
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作者：
Hao Linxing;Gang Chen;Yaoguang Yu;Yansong Zhou;Zhonghui Han;Yue Liu
光催化水分解析氢是将太阳能转化为化学能的一种高效、环保的方法。已经报道了大量的光催化剂，但只有少数能够响应可见光。金属硫化物是一类用于析氢和有机污染物降解的可见光响应半导体光催化剂，由于其窄带隙而受到广泛关注。在此，我们报道了在温和温度下声化学合成具有微球结构的 Bi2S3/CdS 纳米晶体复合材料。在HRTEM图像中可以明显观察到Bi2S3和CdS的相。由两种纳米晶体组成的异质结构在分离光生电荷载流子方面发挥着关键作用。在可见光照射（λ> 400 nm）下研究了水分解的光催化活性，并实现了增强的光催化活性。在不使用任何助催化剂的情况下，H2 初始析出速率高达 5.5 mmol h−1g−1。
Photocatalytic hydrogen evolution from water splitting is an efficient, eco-friendly method for the conversion of solar energy to chemical energy. A great number of photocatalysts have been reported but only a few of them can respond to visible-light. Metal sulfides, a class of visible-light response semiconductor photocatalysts for hydrogen evolution and organic pollutant degradation, receive a lot of attention due to their narrow band gaps. Herein, we report the sonochemical synthesis of Bi2S3/CdS nanocrystal composites with microsphere structure at mild temperature. The phases of Bi2S3and CdS can be observed obviously in HRTEM image. The heterostructure consisting of the two species of nanocrystals plays a key role in separating photo-generated charge carriers. Photocatalytic activities for water splitting are investigated under visible-light irradiation (λ> 400 nm) and an enhanced photocatalytic activity is achieved. The initial rate of H2evolution is up to 5.5 mmol h−1g−1without resorting to any cocatalysts.