Photocatalytic Applications of Carbon Nitride Materials

Graphitic carbon nitride (g-C3N4) has emerged as a versatile metal-free photocatalyst owing to its thermal and chemical robustness, tunable band structure and capability to harvest visible light. Its polymeric heptazine framework can be modified through dopants, defect engineering and morphological control—from two-dimensional nanosheets and nanotubes to one-dimensional rods—to overcome limitations such as rapid charge recombination and narrow spectral response. Such modifications enhance light absorption, prolong carrier lifetimes and increase active surface sites. Applications span solar-driven hydrogen evolution, environmental remediation through pollutant degradation, CO2 reduction and selective organic synthesis. Recent efforts have focused on constructing Z-scheme heterojunctions, depositing co-catalysts and engineering micro-resonance structures to maximise solar-to-chemical energy conversion across diverse reaction environments.

Research from Nature Portfolio

Studies have elucidated the molecular constituents responsible for photocatalytic performance. One investigation identified distinct heptazine-derived units within the polymer that preferentially contribute to light absorption and charge separation, revealing how electronic coupling with oxygen molecules can boost oxidative degradation rates up to eight times compared to bulk analogues. Another work introduced half-metallic carbon nitride nanosheets incorporated into a micro-grid resonance architecture. This design facilitated enhanced carrier mobility and full-spectrum solar exploitation, achieving hydrogen evolution rates above 1 000 μmol g^–1 h^–1. These findings provide atomic-scale guidelines for tailoring electronic structure and optimising photocatalytic efficiency.

Photocatalytic Applications of Carbon Nitride Materials publication trend

The graph below shows the total number of articles in photocatalytic applications of carbon nitride materials across all publications each year (not limited to Nature Index journals).

Technical terms

Photocatalysis: Acceleration of chemical reactions by a light-activated catalyst.

Graphitic carbon nitride (g-C3N4): A polymeric, metal-free semiconductor with a heptazine network, active under visible light.

Z-scheme heterojunction: A dual-semiconductor arrangement that mimics photosynthesis, enabling efficient separation of oxidative and reductive reactions.

Defect engineering: Creation of vacancies or dopant sites in a material’s lattice to introduce electronic states that facilitate charge separation and reactivity.

Charge carrier separation: Spatial or energetic isolation of photoexcited electrons and holes to prevent recombination.

Half-metallicity: Electronic property where a material conducts electrons of one spin orientation while insulating the other, enhancing carrier transport.

References

1. Decade Milestone Advancement of Defect-Engineered g-C3N4 for Solar Catalytic Applications. Nano-Micro Letters (2024).
2. Enhancing multifunctional photocatalysis with acetate‐assisted cesium doping and unlocking the potential of Z‐scheme solar water splitting. Carbon Energy (2023).
3. Half-metallic carbon nitride nanosheets with micro grid mode resonance structure for efficient photocatalytic hydrogen evolution. Nature Communications (2018).
4. Unraveling fundamental active units in carbon nitride for photocatalytic oxidation reactions. Nature Communications (2021).
5. Emerging polymeric carbon nitride Z-scheme systems for photocatalysis. Cell Reports Physical Science (2021).