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Electron-trapping feature on SL-HC-CN for efficient oxygen reduction.

Qi Xu1, Xinyu Lin1, Shuhan Jia1

  • 1Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.

Journal of Colloid and Interface Science
|November 22, 2025
PubMed
Summary

Highly crystalline single-layer carbon nitride (SL-HC-CN) nanosheets were synthesized using a K+ strategy. This method enhances photocatalytic hydrogen peroxide production by improving charge separation and electron trapping.

Keywords:
Carbon nitrideElectron-trapping statesHigh crystallinityHydrogen peroxidePhotocatalysis

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Green Chemistry

Background:

  • Photocatalytic hydrogen peroxide (H2O2) production is a sustainable alternative to the energy-intensive anthraquinone process.
  • Highly crystalline semiconductors with ordered structures and minimal defects are crucial for efficient photocatalysis due to enhanced charge carrier separation and diffusion.

Purpose of the Study:

  • To develop a novel synthesis strategy for highly crystalline single-layer carbon nitride (SL-HC-CN) nanosheets.
  • To investigate the role of K+ ions in enhancing photocatalytic performance for H2O2 production.

Main Methods:

  • A K+ eutectic-guided, programmed thermally-controlled stripping strategy was employed to synthesize SL-HC-CN nanosheets.
  • Characterization of the synthesized materials to assess crystallinity, structural order, and electronic properties.
  • Evaluation of photocatalytic activity for H2O2 production under visible light irradiation.

Main Results:

  • The K+ strategy successfully produced highly crystalline SL-HC-CN nanosheets with expanded π-conjugated systems and stable surface electron-trapping states.
  • K+ ions facilitated structural ordering, enhanced electron mobility, and promoted efficient electron transfer to O2, generating key intermediates for H2O2 synthesis.
  • K+-engineered SL-HC-CN demonstrated broadened visible light absorption, improved charge separation efficiency, and superior H2O2 yield compared to Na+-templated and bulk carbon nitride.

Conclusions:

  • The K+ cation plays a critical role in regulating the crystallinity, electron trapping, and reaction pathways in carbon nitride photocatalysts.
  • The developed synthesis method and K+ engineering provide a pathway for designing highly efficient and selective metal-free photocatalysts for H2O2 production.
  • This study offers valuable insights into cation specificity for optimizing photocatalyst performance.