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Mn0.05Cd0.95S/Cu2SeI p-n heterojunction with high-conductivity for efficient photocatalytic hydrogen evolution
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-07-31 , DOI: 10.1016/j.jiec.2021.07.042
Xiangyi Wang 1 , Zhiliang Jin 1
Affiliation  

It is undoubtedly that constructing heterojunction on the surface of semiconductor materials is an effective way to improve the performance of photocatalysts. Here, Cu2SeI nanospheres were dispersed on the surface of Mn0.05Cd0.95S nanoparticles constructed a p-n heterojunction photocatalyst with high conductivity. Firstly, SEM and TEM showed that the load of Cu2SeI nanospheres successfully formed a close contact on the surface of MCS, which was conducive to the rapid charge transfer between the two. Under visible light irradiation, Na2S/Na2SO3 (0.35 M/0.25 M) was used as sacrifice reagent for hydrogen production. The results showed that the construction of p-n heterojunction was beneficial to charge transfer and the hydrogen evolution ability of the composite catalyst was greatly improve, the 3%MCS/Cu2SeI showed the best hydrogen production activity reaching 677.4 μmol after 5 h, it is 12.3 times higher than that of single catalyst MCS, In addition, the results of X-ray photoelectron spectroscopy (XPS) show that the binding energies of the elements in the composite catalysts are different compared with those in the catalysts alone, indicating that there is a interaction between the catalysts. Through the analysis of photoelectrochemical and fluorescence spectra, the charge transfer kinetics of the composite catalyst was explained and discussed in depth. On the basis of the above analysis results, the possible photocatalytic reaction mechanism of the composite catalyst was proposed, and the mechanism was analyzed and discussed. This work has undoubtedly made a further improvement for the activity of photocatalytic hydrogen production.



中文翻译:

Mn0.05Cd0.95S/Cu2SeI pn 异质结具有高导电性,可实现高效光催化析氢

无疑,在半导体材料表面构建异质结是提高光催化剂性能的有效途径。在这里,Cu 2 SeI 纳米球分散在Mn 0.05 Cd 0.95 S 纳米粒子的表面上,构建了具有高导电性的pn 异质结光催化剂。首先,SEM和TEM表明负载的Cu 2 SeI纳米球成功地与MCS表面形成紧密接触,有利于两者之间的快速电荷转移。在可见光照射下,Na 2 S/Na 2 SO 3(0.35 M/0.25 M) 用作制氢的牺牲试剂。结果表明,pn异质结的构建有利于电荷转移,复合催化剂的析氢能力大大提高,3%MCS/Cu 2SeI 表现出最佳的制氢活性,5 h 后达到 677.4 μmol,是单催化剂 MCS 的 12.3 倍,此外,X 射线光电子能谱 (XPS) 结果表明复合催化剂与单独使用的催化剂不同,表明催化剂之间存在相互作用。通过光电化学和荧光光谱分析,对复合催化剂的电荷转移动力学进行了深入的解释和讨论。在上述分析结果的基础上,提出了复合催化剂可能的光催化反应机理,并对其机理进行了分析和讨论。这项工作无疑对光催化制氢的活性做出了进一步的提高。

更新日期:2021-09-04
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