Direct Synthesis of Large-Area 2D Mo2C on In Situ Grown Graphene

被引：393

作者：

Geng, Dechao ^{[1
,2
]}

Zhao, Xiaoxu ^{[1
,2
]}

Chen, Zhongxin ^{[1
,2
]}

Sun, Weiwei ^{[3
,4
]}

Fu, Wei ^{[1
,2
]}

Chen, Jianyi ^{[1
,2
]}

Liu, Wei ^{[1
,2
]}

Zhou, Wu ^{[4
,5
]}

Loh, Kian Ping ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 17543, Singapore

[2] Natl Univ Singapore, Ctr Adv Mat 2D, 3 Sci Dr 3, Singapore 17543, Singapore

[3] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Univ Chinese Acad Sci, CAS Key Lab Vacuum Phys, Sch Phys Sci, Beijing 100049, Peoples R China

来源：

ADVANCED MATERIALS | 2017年 / 29卷 / 35期

关键词：

2D Mo2C; graphene; molten Cu-Mo alloys; vertical heterostructures; TRANSITION-METAL CARBIDES; HYDROGEN-EVOLUTION; MOS2;

D O I：

10.1002/adma.201700072

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

As a new member of the MXene group, 2D Mo2C has attracted considerable interest due to its potential application as electrodes for energy storage and catalysis. The large-area synthesis of Mo2C film is needed for such applications. Here, the one-step direct synthesis of 2D Mo2C-on-graphene film by molten copper-catalyzed chemical vapor deposition (CVD) is reported. High-quality and uniform Mo2C film in the centimeter range can be grown on graphene using a Mo-Cu alloy catalyst. Within the vertical heterostructure, graphene acts as a diffusion barrier to the phase-segregated Mo and allows nanometer-thin Mo2C to be grown. Graphene-templated growth of Mo2C produces well-faceted, large-sized single crystals with low defect density, as confirmed by scanning transmission electron microscopy (STEM) measurements. Due to its more efficient graphene-mediated charge-transfer kinetics, the as-grown Mo2C-on-graphene heterostructure shows a much lower onset voltage for hydrogen evolution reactions as compared to Mo2C-only electrodes.

引用

页数：8

共 26 条

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Interface confined hydrogen evolution reaction in zero valent metal nanoparticles-intercalated molybdenum disulfide [J].