Rapid synthesis of high-purity molybdenum carbide with controlled crystal phases

The synthesis of phase-pure carbide nanomaterials is crucial for understanding their structure-performance relationships, and for advancing their application in catalysis. Molybdenum carbides, in particular, have garnered increasing interest due to their Pt-like surface electronic properties and hig...

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Bibliographic Details
Published in:Materials horizons 2024-07, Vol.11 (15), p.3595-3603
Main Authors: Fang, Renjie, He, Haoxian, Wang, Zhiyi, Han, Ye-Chuang, Fan, Feng Ru
Format: Article
Language:English
Subjects:
Carbon
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Electronic properties
Electronic structure
Hybrid systems
Hydrogen evolution reactions
Molybdenum
Molybdenum carbide
Nanomaterials
Ohmic dissipation
Phenylenediamine
Purity
Resistance heating
Species diffusion
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Summary:The synthesis of phase-pure carbide nanomaterials is crucial for understanding their structure-performance relationships, and for advancing their application in catalysis. Molybdenum carbides, in particular, have garnered increasing interest due to their Pt-like surface electronic properties and high catalytic activity. Traditional methods for synthesizing molybdenum carbide are often lengthy and energy-intensive, leading to an uncontrolled phase, low purity, and excessive carbon coverage, which hinder their catalytic performance improvement. This work introduces a novel pulsed Joule heating (PJH) technique that overcomes these limitations, enabling the controlled synthesis of high-purity molybdenum carbides (β-Mo C, η-MoC , and α-MoC ) within seconds by using MoO /4-Cl- -phenylenediamine as the hybrid precursor. The PJH method allows precise control over the diffusion of carbon species in the Mo-C system, resulting in a significantly improved phase purity of up to 96.89 wt%. Moreover, the electronic structure of platinum catalysts on molybdenum carbide was modulated through electron metal-support interaction (EMSI) between Pt and Mo C, and contributed to enhanced catalytic performance compared to carbon-supported Pt catalysts during the hydrogen evolution reaction. Overall, this work paves the way for efficient production of high-quality molybdenum carbide nanomaterials, and thus is expected to accelerate their industrial deployments in practical catalytic reactions.
ISSN:2051-6347
2051-6355
2051-6355
DOI:10.1039/d4mh00225c