Ultra-efficient electrocatalytic hydrogen evolution at one-step carbonization generated molybdenum carbide nanosheets/N-doped carbon

作者：Du, Cuicui; Huang, Hao; Wu, Yue; Wu, Siyuan; Song, Wenbo^*

来源：Nanoscale, 2016, 8(36): 16251-16258.

DOI：10.1039/c6nr03657k

• HIGHLY EFFICIENT
• OXYGEN REDUCTION
• NICKEL PHOSPHIDE
• GRAPHENE
• NANOPARTICLES
• CO
• CATALYST
• ARRAY
• MO2C

The hydrogen evolution reaction (HER) from water through electrocatalysis using highly active noble metal-free catalysts as an alternative to precious Pt-based catalysts holds great promise for clean and renewable energy systems. Here, Mo2C nanosheets well-regulated in N-doped carbon (MCNS/NC) are facilely achieved by in situ confining carburization of a Mo-based inorganic-organic lamellar mesostructure at 900 degrees C, and demonstrated for the first time as an ultra-efficient and durable HER catalyst. The MCNS/NC displays a very low onset overpotential of similar to 0 mV and an overpotential of 19 mV at 10 mA cm(-2) with a small Tafel slope of 28.9 mV dec(-1) in acid media, which is remarkably superior to most other transition metal-based catalysts and comparable to commercial Pt/C. The HER kinetics are further studied by EIS and Tafel slope analysis, suggesting the dominant Volmer-Tafel mechanism. An "outside-in" carburization mechanism for the evolution of MCNS/NC is proposed through detailed investigation of the samples annealed at different temperatures. This study highlights the importance of designing well-regulated functional nanostructures combined with a conductive carbonaceous matrix for versatile applications.

• 出版日期2016-9-28
• 单位吉林大学