合成反应时间对ZnIn_2S_4光催化制氢性能的影响

Effect of Reaction Time on Photocatalytic Performance of ZnIn_2S_4 for Hydrogen Production

在无模板、无催化剂、无表面活性剂的条件下,用溶剂热法合成了ZnIn2S4光催化剂.通过X射线衍射、扫描电子显微镜、能谱、X射线光电子能谱、紫外-可见漫反射光谱分析等技术对样品进行了表征,研究了合成反应时间对ZnIn2S4催化剂晶体结构、形貌、光学性质及催化性能的影响.结果表明:ZnIn2S4微球由大量的纳米薄片组成,呈现出花瓣状结构;缩短合成反应时间导致ZnIn2S4晶粒变大,同时样品的稳定性增加,产氢速率增大;ZnIn2S4的催化性能随着合成反应时间的延长而下降;合成反应时间为1 h时制备的样品具有最佳的光催化制氢活性,产氢率达745.8μmol/(h.g).

Photocatalyst Znln2S4 was synthesized via the solvothermal method without templates, catalysts and sur- factants, and the as-synthesized samples were characterized by means of XRD, SEM, EDS, XPS and UV-vis. Moreover, the effects of reaction time on the crystal structure, morphology, optical properties and photocatalytic activity of ZnIn2S4 samples were discussed. The results indicate that Znln2S4 microspheres are composed of nume- rous nanosheets and present petaloid structure, and that, with the decrease of reaction time, the crystallite gradually enlarges, the stability of the samples improves and the hydrogen production rate increases. However, with the increase of reaction time, the photocatalytic activity of ZnIn2S4 decreases. In addition, after a solvothermal proce- dure for l h, the photocatalytic activity of ZnIn2S4 achieves the maximum and the hydrogen production rate is up to 745.8 μmol/（ h·g）.