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Photocatalytic Nitrogen Reduction for Ammonia Synthesis Accelerated by Overcoming Photo-Dember Effect.

Peishen Li1, Yixuan Gao1,2, Alistair G L Borthwick3,4

  • 1College of Environmental Sciences and Engineering, The Key Laboratory of Water and Sediment Sciences (Ministry of Education), Peking University, Beijing, 100871, P.R. China.

Angewandte Chemie (International Ed. in English)
|April 9, 2025
PubMed
Summary

Researchers developed bismuth oxychloride with oxygen vacancies to boost photocatalytic ammonia synthesis. This material overcomes the photo-Dember effect, enhancing nitrogen fixation efficiency for sustainable ammonia production.

Keywords:
Bismuth oxychlorideNitrogen fixationOxygen VacancyPhotocatalysisPhoto‐Dember effect

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Area of Science:

  • Materials Science
  • Catalysis
  • Photochemistry

Background:

  • Photocatalytic nitrogen fixation for ammonia synthesis is crucial for sustainable agriculture.
  • The photo-Dember effect hinders charge carrier migration, reducing nitrogen fixation efficiency.

Purpose of the Study:

  • To synthesize a novel bismuth oxychloride material to overcome the photo-Dember effect.
  • To enhance photocatalytic nitrogen fixation efficiency for ammonia synthesis.

Main Methods:

  • Synthesis of bismuth oxychloride with exposed (101) crystal planes and oxygen vacancies (BOC(101)-OVs).
  • Fabrication of a (101)/(001) interface to generate a self-built electric field.
  • Investigation of charge carrier transfer paths and nitrogen adsorption/reduction mechanisms.

Main Results:

  • Achieved a high NH3 yield of 591.94 µmol g⁻¹ h⁻¹ under simulated solar light.
  • Redirected >95% of photogenerated electrons to surface lateral transfer, bypassing the photo-Dember effect.
  • Identified a new nitrogen reduction pathway facilitated by N 2p-Bi 6p bonding and oxygen vacancies.

Conclusions:

  • The BOC(101)-OVs material effectively suppresses the photo-Dember effect.
  • Enhanced charge carrier migration and novel nitrogen reduction pathways significantly boost ammonia synthesis efficiency.
  • This work offers a new strategy for designing efficient photocatalysts for nitrogen fixation.