Preparation of NiS/ZnIn2S4 as a superior photocatalyst for hydrogen evolution under visible light irradiation.
Preparation of NiS/ZnIn2S4 as a superior photocatalyst for hydrogen evolution under visible light irradiation.
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NiS/ZnIn2S4 可见光催化析氢性能优良光催化剂的制备
DOI：
10.3762/bjnano.4.107
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发表时间：
2013-12-23
影响因子：
3.1
通讯作者：
Li Z
中科院分区：
文献类型：
--
作者：
Wei L;Chen Y;Zhao J;Li Z
总结在这项研究中，NiS/ZnIn 2S 4纳米复合材料成功地通过一个简单的两步水热过程制备。采用X射线衍射（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）和高分辨透射电子显微镜（HRTEM）对样品进行了表征。考察了它们在可见光照射下的光催化析氢性能。结果表明，负载NiS作为助催化剂可以显著提高六方晶系ZnIn 2S 4的光催化析氢活性。通过两步水热过程在ZnIn 2S 4和NiS之间形成良好的结，有利于光激发电子从ZnIn 2S 4向NiS的定向迁移。当NiS负载量为0.5wt%时，催化剂的光催化析氢速率最高（104.7 μmol/h），甚至高于Pt/ZnIn 2S 4纳米复合材料的光催化析氢速率（77.8 μmol/h）。本工作为开发环境友好、廉价的无贵金属助催化剂用于光催化制氢提供了很大的潜力。
Summary In this study, NiS/ZnIn2S4 nanocomposites were successfully prepared via a facile two-step hydrothermal process. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Their photocatalytic performance for hydrogen evolution under visible light irradiation was also investigated. It was found that the photocatalytic hydrogen evolution activity over hexagonal ZnIn2S4 can be significantly increased by loading NiS as a co-catalyst. The formation of a good junction between ZnIn2S4 and NiS via the two step hydrothermal processes is beneficial for the directional migration of the photo-excited electrons from ZnIn2S4 to NiS. The highest photocatalytic hydrogen evolution rate (104.7 μmol/h), which is even higher than that over Pt/ZnIn2S4 nanocomposite (77.8 μmol/h), was observed over an optimum NiS loading amount of 0.5 wt %. This work demonstrates a high potential of the developing of environmental friendly, cheap noble-metal-free co-catalyst for semiconductor-based photocatalytic hydrogen evolution.
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