水热法合成纳米二硫化钼及其电催化性析氢性能研究  

Hydrothermal synthesis of nanometer molybdenum disulfide and its electrocatalytic hydrogen evolution properties

作　　者：张浩翔 胡芳仁 郭俊宏 ZHANG Haoxing;HU Fangren;GUO Junhong(School of Electronics and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院

出　　处：《功能材料》2019年第11期11128-11132,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(61574080、61274121)

摘　　要：二维二硫化钼材料具有良好的电催化析氢性能,然而不同形貌和晶相对二硫化钼电催化性能有极大的影响。分别利用硫代硫酸钠或者硫脲为硫原料,通过简单的水热法成功地合成了MoS2纳米片,然后对所合成的MoS2纳米片进行煅烧处理。利用X射线衍射(XRD)、拉曼光谱(Raman spectrum)、扫描电子显微镜(SEM)分别对水热法合成的MoS2纳米片和煅烧后的MoS2纳米片进行表征,同时,测试水热法合成的MoS2纳米片和煅烧后的MoS2纳米片的电催化析氢性能。实验表明不同硫源和煅烧处理对MoS2纳米片的形貌和析氢性能有一定的影响。以硫代硫酸钠为硫源的MoS2纳米片呈现2H型结构,经煅烧后呈现3R型结构,具有较大的起始过电位和较大的塔菲尔斜率。而以硫脲为硫源的MoS2纳米片在煅烧前后都是2H型,且以硫脲为硫源的MoS2纳米片煅烧后析氢性能优于以硫代硫酸钠为硫源的MoS2纳米片煅烧后的析氢性能,这使其成为用于实际应用的有希望的氢气析出反应(HER)催化剂。The two-dimensional molybdenum disulfide material has good electrocatalytic hydrogen evolution performance. However, different morphologies and crystals have a great influence on the electrocatalytic performance of molybdenum disulfide. In this paper, sodium thiosulfate or thiourea was used as the sulfur raw material, and the MoS2 nanosheets were successfully synthesized by simple hydrothermal method. And then the synthesized MoS2 nanosheets were calcined. X-ray diffraction(XRD), Raman spectroscopy(Raman spectrum) and scanning electron microscopy(SEM) were used to characterize the hydrothermally synthesized MoS2 nanosheets and the calcined MoS2 nanosheets. At the same time, the electrocatalytic hydrogen evolution performance of MoS2 nanosheets and calcined MoS2 nanosheets was tested. Experiments show that different sulfur sources and calcination treatment had certain effects on the morphology and hydrogen evolution performance of MoS2 nanosheets. The MoS2 nanosheets with sodium thiosulfate as the sulfur source exhibited a 2 H structure and a 3 R structure after calcination, which had a large initial overpotential and a large Tafel slope. The MoS2 nanosheets with thiourea as the sulfur source were both 2 H before and after calcination, and the hydrogen evolution performance of MoS2 nanosheets with thiourea as the sulfur source was better than that of MoS2 nanosheets with sodium thiosulfate as the sulfur source. The hydrogen evolution performance made it a promising hydrogen evolution reaction(HER) catalyst for practical applications.

关 键 词：水热合成 硫代硫酸钠 煅烧处理 3R型结构 析氢反应 

分 类 号：TQ125.1[化学工程—无机化工]