Ultrathin molybdenum phosphide films as high-efficiency electrocatalysts for hydrogen evolution reaction

被引:11
作者
Hu, Tingsong [1 ,2 ]
Tai, Guoan [1 ,2 ]
Wu, Zenghui [1 ,2 ]
Wang, Rui [1 ,2 ]
Hou, Chuang [1 ]
Sheng, Lihang [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Lab Intelligent Nano Mat & Devices, Coll Aerosp Engn,Minist Educ, Nanjing 210016, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Sch Mat Sci & Technol, Nanjing 210016, Jiangsu, Peoples R China
来源
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 01期
基金
中国国家自然科学基金;
关键词
molybdenum phosphide; ultrathin film; electrocatalyst; hydrogen evolution reaction; chemical vapor deposition; HIGH CATALYTIC-ACTIVITY; ACTIVE EDGE SITES; GENERATING HYDROGEN; NICKEL PHOSPHIDE; MOS2; NANOSHEETS; GRAPHENE; NANOPARTICLES; NANOMATERIALS; CHEMISTRY;
D O I
10.1088/2053-1591/aae6c0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanostructured molybdenum phosphide (MoP) has been considered as a kind of high-efficient electrochemical catalysts, which has a huge potential to replace noble metal Pt-based electrocatalysts in hydrogen evolution reaction (HER). Accordingly, ultrathin two-dimensional (2D) metal phosphides are expected to have higher HER activities owing to being supposed to have both maximizing surface active site densities and fast electron transport. However, the synthesis of ultrathin MoP films has experimentally not been still realized. Here we report the controllable synthesis of the ultrathin MoP film via direct phosphorization of pre-annealed molybdenum foil surfaces at elevated temperature. Especially, the ultrathin MoP film of 4.87 nm in thickness can be grown by reacting the Mo foil surfaces with a phosphorus vapour at 900 degrees C within 30 min. Furthermore, the nanofilm shows a superior electrochemical stability in acidic solution and has a small Tafel slope of 56 mV/dec which is smaller than that of the corresponding bulk. The metallicity of the MoP nanofilm predicted by the first-principles calculations, can be partly responsible for the robust electrocatalytic HER performance, which facilitates fast electron transport along the electrocatalytic active edges of the nanofilm for improving the HER activity.
引用
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页数:10
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