In situ construction of NiSe/Mn0.5Cd0.5S composites for enhanced photocatalytic hydrogen production under visible light
In situ construction of NiSe/Mn0.5Cd0.5S composites for enhanced photocatalytic hydrogen production under visible light
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原位构建 NiSe/Mn0.5Cd0.5S 复合材料增强可见光下光催化产氢
DOI：
10.1016/j.apcatb.2019.118439
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发表时间：
2020-07-05
影响因子：
22.1
通讯作者：
Huang, Caijin
中科院分区：
文献类型：
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作者：
Jiang, Xinwei;Gong, Haisheng;Huang, Caijin
MnxCd 1-xS固溶体是一种新型的可调禁带半导体光催化分解水。然而，光催化活性的提高仍有很大的空间。在本文中，我们通过原位水热合成用不含贵金属的NiSe对Mn-0.5Cd 0.5S进行改性。在可见光下，NiSe/Mn-0.5Cd0.5S纳米复合材料具有高效的光催化产氢性能，最高产氢速率达到28.08 mmol/h/g，高于Mn-0.5Cd0.5S（13.71 mmol/h/g）和1 wt% Pt/Mn-0.5Cd0.5S（24.22 mmol/h/g）。通过紫外-可见漫反射光谱、光致发光光谱、时间分辨光致发光光谱和光电化学测试，发现NiSe与Mn-0.5Cd-0.5S之间存在良好的匹配结构，有利于电荷转移，延长了光生电子寿命，从而提高了光催化活性。
MnxCd1-xS solid solution is an emerging semiconductor for photocatalytic water splitting with a tunable bandgap. However, it still leaves much room to improve the photocatalytic activity. Herein, we modified Mn-0.5Cd0.5S with noble metal-free NiSe by an in-situ hydrothermal synthesis. The as-obtained NiSe/Mn-0.5Cd0.5S nanocomposites exhibited highly efficient photocatalytic H-2 production under visible light and the highest hydrogen generation rate reaches 28.08 mmol/h/g, which is higher than that of Mn-0.5Cd0.5S (13.71 mmol/h/g) and 1 wt% Pt/Mn-0.5Cd0.5S (24.22 mmol/h/g). Through the detailed analyses of UV-vis DRS, photoluminescence (PL) spectra, time-resolved photoluminescence (TRPL) and photoelectrochemical tests, we found the wellmatched structure between NiSe and Mn-0.5Cd0.5S, which facilitates the charge transfer and prolongs the lifetime of photo-induced electrons, and thus improves photocatalytic activity.