Promoting the Photocatalytic H2 Evolution Activity of CdLa2S4 Nanocrystalline using Few-layered WS2 Nanosheet as a co-catalyst
Promoting the Photocatalytic H2 Evolution Activity of CdLa2S4 Nanocrystalline using Few-layered WS2 Nanosheet as a co-catalyst
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使用少层WS2纳米片作为助催化剂提高CdLa2S4纳米晶的光催化析氢活性
DOI：
10.1016/j.ijhydene.2021.10.227
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发表时间：
2022
影响因子：
7.2
通讯作者：
林君
中科院分区：
文献类型：
--
作者：
刘小明;陈雪雅;王苏庆;颜流水;严家俊;郭会琴;杨芳;林君
本文采用超声剥离法结合水热法制备了一系列多层WS 2纳米片，然后通过超声剥离法和水热法在多层WS 2纳米片表面原位生长CdLa 2S 4纳米晶，制备了WS 2/CdLa 2S 4复合材料。研究表明，所制备的WS 2/CdLa 2S 4复合材料具有良好的可见光催化活性。结果表明，在CdLa 2S 4纳米晶的质量分数为5%左右时，WS 2纳米片的最佳含量为5%左右，此时的析氢速率比单一的CdLa 2S 4纳米晶的析氢速率提高了6倍左右。经4次循环后，WS 2/CdLa 2S 4复合材料仍保持较高的光催化活性。将多层WS 2纳米片作为助催化剂与CdLa 2S 4纳米片相结合，不仅有利于光生载流子的有效分离，而且促进了更多的析氢活性位点。该复合光催化剂具有良好的可见光响应性和光化学稳定性，在太阳能驱动水制氢方面具有良好的应用前景。
In this work, a series of few-layered WS2nanosheets were fabricated through an ultrasonic stripping method assisted by a hydrothermal process, then the WS2/CdLa2S4composites were prepared by growing CdLa2S4nanocrystallines in situ on the surface of few-layered WS2nanosheets through an ultrasonic stripping method followed by a hydrothermal process. Investigation shows that the prepared WS2/CdLa2S4composite shows an excellent photocatalytic activity toward hydrogen evolution from water with visible light response. The optimized content of few-layer of WS2nanosheet was estimated to be around 5 wt% of CdLa2S4nanocrystalline and the corresponding hydrogen evolution rate is about 6 times higher than that of single phase of CdLa2S4nanocrystalline. Furthermore, the WS2/CdLa2S4composites still keep high photocatalytic activity after 4 times circles. Combining few-layered WS2nanosheets as a co-catalyst with CdLa2S4nanocrystallines not only facilitate the efficient separation of photogenerated carriers, but also promote more active sites for hydrogen evolution. Considering its excellent photocatalytic activity toward H2evolution with visible light response and photochemistry stability, the obtained WS2/CaLa2S4composite photocatalyst has promising application for practical photocatalytic H2production from H2O drived by solar energy.