Electrocatalytic Hydrogen Production from Transition Metal Phosphides

Electrocatalytic water splitting offers a sustainable route to high-purity hydrogen fuel by driving the hydrogen evolution reaction (HER) at the cathode. Transition metal phosphides (TMPs) such as cobalt, nickel and iron phosphides have emerged as cost-effective, earth-abundant alternatives to platinum-group catalysts. Their intrinsic metallic conductivity, tunable electronic structure and strong metal–phosphorus bonds confer activity and stability under a range of pH conditions. By controlling composition, crystal structure, facet exposure and doping, researchers can optimise active‐site density, charge transfer kinetics and surface stability. Recent advances have demonstrated that in situ surface reconstruction, heterostructure design and nanoscale engineering yield remarkable reductions in overpotential and improvements in long-term durability. Such progress accelerates the deployment of electrolyser technologies for green hydrogen production, energy storage and carbon-neutral fuel cycles.

Research from Nature Portfolio

Recent studies have revealed that controlled in situ amorphization of TMP nanosheets dramatically enhances HER activity in alkaline media. By doping trace amounts of ruthenium into nickel phosphosulfide layers, an amorphous surface layer rich in bridged sulphur species forms under operation, creating highly active edge sites and reducing reaction energy barriers. In situ electrochemical transmission electron microscopy confirms the dynamic reconstruction pathway, while theory clarifies the stabilisation role of the dopant in lowering the overpotential. Earlier seminal work on pyrite‐structured cobalt phosphosulfide nanoparticles grown on conductive carbon nanotubes established a blueprint for hybrid architectures that combine conductivity, catalytic activity and chemical stability. Sequential synthetic steps imparted each function, enabling current densities of tens of milliamps per square centimetre at overpotentials well below 100 mV. The molecular origins of stabilised activity were revealed by advanced spectroscopies and computational modelling, highlighting the critical role of phosphorus substitution in maintaining durability under acidic conditions.

Electrocatalytic Hydrogen Production from Transition Metal Phosphides publication trend

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

Technical terms

Electrocatalysis: The acceleration of electrochemical reactions at an electrode surface by a catalyst.

Hydrogen Evolution Reaction (HER): The electrochemical conversion of protons or water molecules into molecular hydrogen at the cathode.

Overpotential: The additional potential beyond the thermodynamic requirement needed to drive an electrochemical reaction at a specified rate.

Tafel slope: A parameter describing the change in overpotential per decade change in current density, indicative of reaction kinetics.

Transition Metal Phosphide: A class of compounds combining a transition metal with phosphorus, known for metallic conductivity and catalytic activity.

In situ surface amorphization: The formation of an amorphous layer on a catalyst surface during operation that enhances active-site density and flexibility.

Heterostructure: A composite material consisting of two or more distinct phases or compounds with engineered interfaces to optimise catalytic performance.

References

1. Unraveling and leveraging in situ surface amorphization for enhanced hydrogen evolution reaction in alkaline media. Nature Communications (2023).
2. A highly active and stable hydrogen evolution catalyst based on pyrite-structured cobalt phosphosulfide. Nature Communications (2016).
3. Unusual Activity of Rationally Designed Cobalt Phosphide/Oxide Heterostructure Composite for Hydrogen Production in Alkaline Medium. ACS Nano (2022).
4. MOF-Derived Ultrathin Cobalt Molybdenum Phosphide Nanosheets for Efficient Electrochemical Overall Water Splitting. Nanomaterials (2022).
5. Topochemical Synthesis of Two‐Dimensional Transition‐Metal Phosphides Using Phosphorene Templates. Angewandte Chemie International Edition (2019).