Direct Synthesis of Large-Area 2D Mo<sub>2</sub> C on In Situ Grown Graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 28722179.
- Also identified by DOI 10.1002/adma.201700072.
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Abstract
As a new member of the MXene group, 2D Mo<sub>2</sub> C has attracted considerable interest due to its potential application as electrodes for energy storage and catalysis. The large-area synthesis of Mo<sub>2</sub> C film is needed for such applications. Here, the one-step direct synthesis of 2D Mo<sub>2</sub> C-on-graphene film by molten copper-catalyzed chemical vapor deposition (CVD) is reported. High-quality and uniform Mo<sub>2</sub> C 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 Mo<sub>2</sub> C to be grown. Graphene-templated growth of Mo<sub>2</sub> C 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 Mo<sub>2</sub> C-on-graphene heterostructure shows a much lower onset voltage for hydrogen evolution reactions as compared to Mo<sub>2</sub> C-only electrodes.