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Controlling Selectivity for Efficient Nitrogen Photo-Fixation Over Hydrogen Evolution using Anthracene-Containing D-A

Jian Gao1, Xiao Bai1, Lixin Shan1

  • 1State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China.

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Summary
This summary is machine-generated.

Researchers developed novel organic photocatalysts for artificial ammonia synthesis. By tuning the donor-acceptor ratio in conjugated polymers, they significantly boosted nitrogen fixation efficiency while suppressing hydrogen evolution, offering a promising route for sustainable ammonia production.

Keywords:
N2 photo‐fixationconjugated polymer photocatalystsdonor–acceptor structuremolar ratio adjustment

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Green Chemistry

Background:

  • Donor-acceptor (D-A) organic photocatalysts are key for artificial ammonia (NH3) photosynthesis.
  • Current limitations include poor N2 chemisorption and selectivity, hindering efficiency.

Purpose of the Study:

  • To design and synthesize novel D-A conjugated polymers for enhanced photocatalytic nitrogen reduction reaction (NRR).
  • To investigate the effect of donor-to-acceptor molar ratios on NRR and hydrogen evolution reaction (HER) selectivity.
  • To demonstrate the broad applicability of the D-A platform for N2 fixation.

Main Methods:

  • Synthesis of conjugated polymers with varying anthracene (donor) and dibenzothiophene sulfone (acceptor) ratios.
  • Photocatalytic evaluation of NH3 production and HER under full-spectrum irradiation without sacrificial agents.
  • Analysis of structure-activity relationships, focusing on N2 chemisorption and charge separation.

Main Results:

  • The NH3 production rate increased with higher anthracene content, with a 1:1 ratio (AnSO-6) achieving 1645.25 µmol g⁻¹ h⁻¹.
  • Enhanced N2 chemisorption, electron transfer, and charge separation were observed in optimized D-A structures.
  • A tunable selectivity between NRR and HER was achieved by adjusting the donor-to-acceptor ratio.

Conclusions:

  • Rational design of D-A conjugated polymers offers a powerful strategy to boost photocatalytic NH3 production.
  • Precise control over the donor-to-acceptor ratio is crucial for optimizing NRR efficiency and selectivity.
  • The BTSO-based D-A platform shows broad applicability for efficient photocatalytic N2 fixation.