Electrocatalytic Hydrogen Production Using Transition Metal Carbides

Transition metal carbides have emerged as a class of earth-abundant electrocatalysts that mimic the electronic properties of platinum while offering superior stability and cost advantages. Molybdenum and tungsten carbides, in particular, exhibit tunable surface chemistries and strong metal–hydrogen interactions that facilitate the hydrogen evolution reaction (HER) across acidic and alkaline media. Advances in nanostructuring, heterostructure design and doping strategies have enabled control over active sites, electronic density and mass transport. Phase engineering and rapid synthetic methods further allow the selective production of highly active polymorphs. Together, these developments are driving electrocatalytic performance towards low overpotentials, small Tafel slopes and long-term durability at industrially relevant current densities, bringing sustainable hydrogen production closer to large-scale deployment.

Research from Nature Portfolio

Recent studies have reported a self-standing electrode composed of MoC–Mo₂C heterojunctions prepared by a one-step electro-carbiding process. This electrode achieves low overpotentials of around 250 mV at 500 mA cm⁻² in both acid and alkali, maintains performance for over 100 days and can be scaled to multimetre formats. A thermal-migration strategy has been used to form tungsten atomic clusters on phosphorus-doped carbon supports, endowing Pt-like electronic structure and delivering an overpotential below 60 mV at 10 mA cm⁻² with rapid kinetics in alkaline HER. Ultrafast flash Joule heating has enabled phase-pure synthesis of molybdenum carbide nanocrystals (β-Mo₂C and metastable α/η-MoC₁₋ₓ) within one second; phase comparison identifies β-Mo₂C as the most active polymorph, illustrating the power of phase engineering for catalyst optimisation.

Electrocatalytic Hydrogen Production Using Transition Metal Carbides publication trend

The graph below shows the total number of articles in electrocatalytic hydrogen production using transition metal carbides across all publications each year (not limited to Nature Index journals).

Technical terms

Electrocatalysis: Acceleration of an electrochemical reaction at the electrode surface by a catalyst.

Hydrogen evolution reaction (HER): The reduction of protons to hydrogen gas at the cathode during water splitting.

Overpotential: The extra voltage required beyond the thermodynamic potential to drive an electrochemical reaction.

Tafel slope: A parameter indicating the change in overpotential with current density, reflecting reaction kinetics.

Heterojunction: An interface between two different materials or crystal phases that can enhance charge transfer.

Atomic cluster: A small ensemble of metal atoms dispersed on a support, maximising atom efficiency.

Phase engineering: Control of the crystal structure or polymorph of a material to tune its properties.

Flash Joule heating: A rapid electrical pulsing method to synthesise nanomaterials within seconds by ultrafast heating.

References

1. A durable and pH-universal self-standing MoC–Mo2C heterojunction electrode for efficient hydrogen evolution reaction. Nature Communications (2021).
2. Thermal migration towards constructing W-W dual-sites for boosted alkaline hydrogen evolution reaction. Nature Communications (2022).
3. Phase controlled synthesis of transition metal carbide nanocrystals by ultrafast flash Joule heating. Nature Communications (2022).
4. Synergistic Effect of Dual-Doped Carbon on Mo2C Nanocrystals Facilitates Alkaline Hydrogen Evolution. Nano-Micro Letters (2023).
5. Experimental and DFT studies of flower-like Ni-doped Mo2C on carbon fiber paper: A highly efficient and robust HER electrocatalyst modulated by Ni(NO3)2 concentration. Journal of Advanced Ceramics (2022).
6. Heteronanowires of MoC–Mo 2 C as efficient electrocatalysts for hydrogen evolution reaction. Chemical Science (2016).