Photocatalytic Hydrogen Production Using MXene Composites

MXene composites, consisting of two-dimensional transition metal carbides or nitrides, have garnered significant attention as emerging co-catalysts and supports for solar-driven water splitting. Their unique combination of metallic conductivity, large specific surface area and tunable surface terminations enables efficient light absorption, rapid charge transport and strong interfacial interactions with semiconductor photo-absorbers. By forming intimate heterojunctions or Schottky contacts, MXenes facilitate separation of photogenerated electron–hole pairs, reduce overpotentials for hydrogen evolution and accelerate surface reaction kinetics. Integration strategies—ranging from hydrothermal growth of metal-sulfide or oxide photocatalysts on MXene nanosheets to coordination-bonded hybrids with metal–organic frameworks—have yielded systems that achieve high hydrogen evolution rates under visible light, often rivalling or surpassing precious-metal benchmarks. Beyond fundamental advances in band alignment and interface engineering, these composites promise scalable, cost-effective routes to green hydrogen, with implications for renewable energy storage, fuel cells and decarbonised industrial processes. Remaining challenges include long-term stability under operating conditions, environmental compatibility of surface chemistries and rational design of multi-functional architectures for overall water splitting without sacrificial reagents.

Research from Nature Portfolio

Foundational work has demonstrated that Ti₃C₂ MXene nanoparticles, when rationally integrated with cadmium sulfide via a hydrothermal strategy, serve as highly efficient co-catalysts for visible-light hydrogen evolution. This composite achieved hydrogen production rates exceeding 14,000 μmol h⁻¹ g⁻¹ with an apparent quantum efficiency around 40% at 420 nm. The exceptional performance was attributed to the favourable Fermi level alignment, enhanced electrical conductivity and inherent hydrogen evolution capacity of Ti₃C₂. Furthermore, the same MXene co-catalyst design was successfully extended to alternative metal sulfides, illustrating a versatile platform for earth-abundant, high-performance photocatalysts.

Photocatalytic Hydrogen Production Using MXene Composites publication trend

The graph below shows the total number of articles in photocatalytic hydrogen production using mxene composites across all publications each year (not limited to Nature Index journals).

Technical terms

MXene: Two-dimensional transition metal carbides or nitrides with metallic conductivity and tunable surface terminations.

Photocatalytic water splitting: Light-driven process in which a semiconductor absorbs photons to generate hydrogen and oxygen from water.

Co-catalyst: Secondary material that enhances surface reaction kinetics and aids in separation of charge carriers for hydrogen evolution.

Schottky junction: Interface between a metal and a semiconductor that facilitates directional electron transfer and suppresses recombination.

Heterostructure: Composite of two or more semiconductors or functional materials engineered to promote efficient charge-carrier separation.

References

1. Ti3C2 MXene co-catalyst on metal sulfide photo-absorbers for enhanced visible-light photocatalytic hydrogen production. Nature Communications (2017).
2. Rational Design of Coordination Bond Connected Metal Organic Frameworks/MXene Hybrids for Efficient Solar Water Splitting. Advanced Functional Materials (2022).
3. Efficient photocatalytic hydrogen evolution coupled with benzaldehyde production over 0D Cd0.5Zn0.5S/2D Ti3C2 Schottky heterojunction. Journal of Advanced Ceramics (2022).
4. Enhanced Photocatalytic Hydrogen Production of ZnIn2S4 by Using Surface-Engineered Ti3C2Tx MXene as a Cocatalyst. Materials (2023).