Tuning the hydrogen evolution activity of β-Mo2C nanoparticles via control of their growth conditions.

@article{Yang2017TuningTH,
  title={Tuning the hydrogen evolution activity of $\beta$-Mo2C nanoparticles via control of their growth conditions.},
  author={Timothy T Yang and Wissam A. Saidi},
  journal={Nanoscale},
  year={2017},
  volume={9 9},
  pages={
          3252-3260
        }
}
The use of water electrocatalysis for hydrogen production is a promising, sustainable and greenhouse-gas-free process to develop disruptive renewable energy technologies. Transition metal carbides, in particular β-phase Mo2C, are garnering increased attention as hydrogen evolution reaction (HER) catalysts due to their favourable synthesis conditions, stability and high catalytic efficiency. We use a thermodynamic approach in conjunction with density functional theory and a kinetic model of… 

Figures from this paper

A Review of Preparation Strategies for α-MoC1-x Catalysts
Transition metal carbides are attracting growing attention as robust and affordable alternative heterogeneous catalysts to platinum group metals, for a host of contemporary and established
The effects of exfoliation, organic solvents and anodic activation on the catalytic hydrogen evolution reaction of tungsten disulfide.
TLDR
The performance enhancement was found to arise primarily from the ability of a formed proton-intercalated amorphous tungsten trioxide (a-WO3) to provide additional active sites and favourably modify the immediate chemical environment of the WS2 catalyst, rendering it more favorable for local proton delivery and/or transport to the active edge site of WS2.
Unique Hierarchical Mo2C/C Nanosheet Hybrids as Active Electrocatalyst for Hydrogen Evolution Reaction.
TLDR
A facile and effective pyrolysis stratagem is proposed for the synthesis of hierarchical Mo2C/C nanosheet hybrids with sodium chloride (NaCl) crystals as a template, which demonstrated excellent hydrogen evolution reaction (HER) performance in both alkaline and acid medias and remarkable stability.
2D Co6Mo6C Nanosheets as Robust Hydrogen Evolution Reaction Electrocatalyst
Hydrogen production by electrochemical water splitting via nonprecious metal catalysts is still a great challenge due to sluggish kinetics and poor electrochemical durability toward hydrogen
Structural Design and Electronic Modulation of Transition‐Metal‐Carbide Electrocatalysts toward Efficient Hydrogen Evolution
TLDR
Specific nanostructures and carbon-based hybrids are introduced to increase active-site abundance and to promote mass transportation, and heteroatom doping and heterointerface engineering are encouraged to optimize the chemical configurations of active sites toward intrinsically boosted HER kinetics.
Vertically Aligned MoS2/Mo2C hybrid Nanosheets Grown on Carbon Paper for Efficient Electrocatalytic Hydrogen Evolution
Maximizing and creating active sites has been a general strategy to increase the performance of a catalyst. Because of the high electrocatalytic hydrogen evolution reactivity (HER) of ultrafine Mo2C
Effect of Platinum, Gold, and Potassium Additives on the Surface Chemistry of CdI2-Antitype Mo2C
TLDR
It was observed that the presence of both Pt and K stabilizes the transition state for the C-O bond dissociation, lowering the activation barrier for the dissociation of the C–O bond by about 0.3 and 0.4 eV, respectively.
...
1
2
3
...

References

SHOWING 1-10 OF 80 REFERENCES
Molybdenum phosphide as an efficient electrocatalyst for the hydrogen evolution reaction
Electrochemical production of hydrogen from water has been directed to the search for non-noble metal based and earth-abundant catalysts. In this work, we propose a novel cost-effective catalyst,
Exploration of the electrochemical mechanism of ultrasmall multiple phases molybdenum carbides nanocrystals for hydrogen evolution reaction
Sustainable and affordable hydrogen production through splitting of water, an essential step towards renewable and clean energy storage, calls for efficient non-precious-metal catalysts to make the
Low-molecular-weight carbon nitrides for solar hydrogen evolution.
TLDR
It is demonstrated here that reduction of the synthesis temperature leads to a mixture of the monomer melem and its higher condensates and it is shown that this mixture can be separated and provided evidence that the higher Condensates are isolated oligomers of melem.
Understanding divergent behaviors in the photocatalytic hydrogen evolution reaction on CdS and ZnS: a DFT based study.
TLDR
The most stable CdS and ZnS(110) termination under the conditions of photocatalytic HER, i.e., pure (110), is determined by calculating the free energies of three reactions related to H2O dissociation on (110).
Size-Dependent Enhancement of Electrocatalytic Oxygen-Reduction and Hydrogen-Evolution Performance of MoS2 Particles.
TLDR
The exposed abundant Mo edges of the MoS2 nanoparticles were proven to be responsible for the high ORR catalytic activity, whereas the origin of the improved HER activity of the nanoparticles was attributed to the plentiful exposed S edges.
Highly active and durable nanostructured molybdenum carbide electrocatalysts for hydrogen production
In an attempt to tailor low-cost, precious-metal-free electrocatalysts for water electrolysis in acid, molybdenum carbide (β-Mo2C) nanoparticles are prepared by in situ carburization of ammonium
Coupled molybdenum carbide and reduced graphene oxide electrocatalysts for efficient hydrogen evolution
TLDR
A two-dimensional coupled hybrid of molybdenum carbide and reduced graphene oxide with a ternary polyoxometalate-polypyrrole/reduced graphene oxide nanocomposite as a precursor exhibits outstanding electrocatalytic activity for the hydrogen evolution reaction and excellent stability in acidic media, which is the best among these reported non-noble-metal catalysts.
Multiple phases of molybdenum carbide as electrocatalysts for the hydrogen evolution reaction.
Molybdenum carbide has been proposed as a possible alternative to platinum for catalyzing the hydrogen evolution reaction (HER). Previous studies were limited to only one phase, β-Mo2C with an Fe2N
Conducting MoS₂ nanosheets as catalysts for hydrogen evolution reaction.
TLDR
By partially oxidizingMoS2, it is found that the activity of 2H MoS2 is significantly reduced after oxidation, consistent with edge oxidation, and 1T MoS 2 remains unaffected after oxidization, suggesting that edges of the nanosheets are not the main active sites.
...
1
2
3
4
5
...