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The construction of double type II heterostructure from CdS and Ni-MOF-74 with two structures and enhanced mechanism of photocatalytic water splitting

光催化 材料科学 分解水 X射线光电子能谱 制氢 异质结 化学工程 可见光谱 复合数 纳米颗粒 纳米技术 复合材料 催化作用 化学 光电子学 有机化学 工程类
作者
Lu Niu,Wanggang Zhang,Hao-tian Li,Hongxia Wang,Jian Wang,Yiming Liu
出处
期刊:Journal of Materials Science [Springer Science+Business Media]
卷期号:57 (10): 5768-5787 被引量:20
标识
DOI:10.1007/s10853-022-07014-0
摘要

Visible light-driven hydrogen production by water splitting has attracted much attention because of its advantages of low cost, relative safety, and environmental friendliness. In this paper, a series of Ni-MOF-74 materials, Ni-MOF-74(X), with different morphologies and structures were synthesized by controlling the amount (X mL) of added water. Then, various CdS/Ni-MOF-74 composites were prepared by simple mechanical mixing of Ni-MOF-74(X) and CdS nanoparticles. The morphology and structures of CdS, Ni-MOF-74(X), and CdS/Ni-MOF-74(X) were analyzed by SEM, TEM, XRD, FT-IR, BET, and XPS. The optical properties of the composites were analyzed by UV–visible DRS, PL, TRPL, and photoelectrochemical experiments. The results show that Ni-MOF-74 is formed with a Ni3(OH)2(H2O)2(tp)2 structure (tp: terephthalate) at low water amounts and with a [Ni3(OH)2(H2O)4(tp)2]·2H2O structure when sufficient water was present to promote its formation. Mixed structures of Ni-MOF-74 containing Ni3(OH)2(H2O)2(tp)2 and [Ni3(OH)2(H2O)4(tp)2]·2H2O are formed when the water amount is between 5 and 40 mL. The CdS/Ni-MOF-74(15) composite has the best photocatalytic hydrogen evolution performance under visible light irradiation, and the maximum produced hydrogen amount is 3117.9 μmol after 3 h, which is 12.8 times that of pure CdS nanoparticles. The composite of CdS and Ni-MOF-74 with a mixed structure exhibits better photocatalytic hydrogen production performance than the composite based on Ni-MOF-74 with a single structure. As an explanation for the superior activity, a double type II heterostructure is formed by CdS and Ni-MOF-74 with two structures. The photogenerated electrons in the conduction band (CB) of CdS spontaneously transfer to the CB of Ni-MOF-74, which is beneficial to the improvement in the separation of photogenerated carriers in hydrogen evolution.
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