层状MoS<sub>2</sub>/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

doi:10.13700/j.bh.1001-5965.2014.0709

层状MoS₂/Graphene薄膜的制备及其电催化制氢性能

doi: 10.13700/j.bh.1001-5965.2014.0709

北京航空航天大学材料科学与工程学院, 北京 100191

基金项目: 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)

详细信息

作者简介:
杨阳(1991-),男,湖北孝感人,硕士研究生,yangyang199161@163.com

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.

中图分类号: O643.3
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出版历程
- 收稿日期: 2014-11-17
- 修回日期: 2014-12-18
- 网络出版日期: 2015-11-20

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

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

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.
- 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.
- hydrogen production by water electrolysis /
- MoS₂/Graphene composite catalysts /
- hydrothermal synthesis /
- electrocatalytic activity /
- Tafel slope

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