北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (11): 2158-2165.doi: 10.13700/j.bh.1001-5965.2014.0709

• 论文 • 上一篇    下一篇

层状MoS2/Graphene薄膜的制备及其电催化制氢性能

杨阳, 许頔, 吴卿永, 项民, 刁鹏   

  1. 北京航空航天大学材料科学与工程学院, 北京 100191
  • 收稿日期:2014-11-17 修回日期:2014-12-18 出版日期:2015-11-20 发布日期:2015-12-01
  • 通讯作者: 刁鹏(1967-),男,山东龙口市人,教授,博士生导师,pdiao@buaa.edu.cn,主要研究方向为能源材料、太阳能转化与存储等. E-mail:diao@buaa.edu.cn
  • 作者简介:杨阳(1991-),男,湖北孝感人,硕士研究生,yangyang199161@163.com
  • 基金资助:
    国家自然科学基金(21173016,20973020);北京市自然科学基金(2142020);国家教育部博士点专项基金(20101102110002)

Preparation of layered MoS2/Graphene films and their electrocatalytic performance of hydrogen generation

YANG Yang, XU Di, WU Qingyong, XIANG Min, DIAO Peng   

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-11-17 Revised:2014-12-18 Online:2015-11-20 Published:2015-12-01

摘要: 采用水热合成的方法,以硫脲(NH2CSNH2)为硫源和还原剂,合成出了二硫化钼/石墨烯(MoS2/Graphene)复合电催化剂用于电解水制氢.将其旋涂到掺杂氟的SnO2透明导电玻璃(FTO)上制备成MoS2/Graphene薄膜进行电催化分解水制氢性能测试.研究发现,MoS2/Graphene的催化活性较纯纳米MoS2提高了近一倍.这是由于通过化学耦合作用选择性生长在石墨烯上的层状MoS2其边缘拥有丰富的活性位点,同时石墨烯作为良好的导电基体也能大大加快了电子的转移速度.在0.5 mol/L H2SO4溶液中,MoS2/Graphene旋涂到FTO上的层数为12层时,其电催化制氢效率最高:起峰电位提前到0.085 V,在0.2 V的过电位下电流密度达到了-4.5 mA/cm2.层状MoS2/Graphene电催化剂作为Pt族贵金属的替代品,具有广阔的应用前景.

关键词: 电解水制氢, 二硫化钼/石墨烯复合电极, 水热合成, 电催化活性, 塔菲尔斜率

Abstract: MoS2/Graphene electrocatalysts which were used for water-electrolytic hydrogen making were synthesized using a hydrothermal method among which NH2CSNH2(thiourea) was served as both the source of sulfur and the reductive agent. MoS2/Graphene films prepared on fluorine-doped tin oxide (FTO) by spin coating method were applied for performance test of electrocatalytic water splitting. The study shows that the activity of MoS2 toward hydrogen evolution reaction improves as high as nearly 100% after coupling with graphene. The high catalytic activity of MoS2/Graphene was attributed to two aspects:firstly, the selective growth of layered MoS2 on graphene through chemical coupling afforded an abundance of catalytic active sites on MoS2 edges. Secondly, as a good conductive substrate, the graphene sheets can accelerate the electron transfer. The 12 layered MoS2/Graphene catalysts achieved the highest efficiency toward hydrogen evolution reaction with a current density up to -4.5 mA/cm2 at the overpotential of 0.2 V and an onset potential of 0.085 V in 0.5 mol/L H2SO4 solution. Hence, as a substitute for Pt family noble metal toward hydrogen evolution reaction, the layered MoS2/Graphene has broad application prospects.

Key words: hydrogen production by water electrolysis, MoS2/Graphene composite catalysts, hydrothermal synthesis, electrocatalytic activity, Tafel slope

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