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Related Concept Videos

P-N junction01:11

P-N junction

600
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
600

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Updated: Aug 13, 2025

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Plasma-Assisted Defect Engineering on p-n Heterojunction for High-Efficiency Electrochemical Ammonia Synthesis.

Jiameng Liu1, Linghao He1, Shuangrun Zhao1

  • 1College of Material and Chemical Engineering, Institute of New Energy Science and Technology, School of Future Hydrogen Energy Technology, Zhengzhou University of Light Industry, Zhengzhou, 450001, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 23, 2023
PubMed
Summary

A novel defect-rich 2D heterojunction catalyst efficiently converts nitrogen to ammonia at ambient conditions. This breakthrough offers a promising pathway for sustainable ammonia synthesis and energy storage applications.

Keywords:
boron nanosheetsdefect engineeringelectrocatalytic nitrogen reduction reaction (eNRR)p-n heterojunctionssemiconductive metal-organic frameworks

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts for nitrogen reduction reaction (NRR) is crucial for sustainable ammonia synthesis.
  • Existing catalysts often require harsh conditions or suffer from low efficiency and selectivity.
  • Metal-organic frameworks (MOFs) and boron-based materials show potential but require further optimization.

Purpose of the Study:

  • To construct a defect-rich 2D p-n heterojunction catalyst for electrocatalytic nitrogen reduction reaction (eNRR) under ambient conditions.
  • To investigate the role of interface engineering and plasma-assisted defects in enhancing catalytic activity.
  • To explore the application of the developed catalyst in a zinc-nitrogen battery.

Main Methods:

  • In situ solution plasma modification to synthesize the CoₓNi₃₋ₓ(HITP)₂/BNSs-P heterojunction.
  • Characterization of the heterojunction's structure, defects, and active sites (Co-N₃ and B…O).
  • Electrochemical evaluation of the catalyst for eNRR, including ammonia yield and Faradaic efficiency.
  • In situ FTIR spectroscopy and DFT calculations to elucidate the catalytic mechanism.
  • Fabrication and testing of a Zn-N₂ battery utilizing the catalyst.

Main Results:

  • The CoₓNi₃₋ₓ(HITP)₂/BNSs-P heterojunction exhibited dual-active sites (Co-N₃ and B…O) due to defect engineering.
  • Achieved a high NH₃ yield of 128.26 ± 2.27 µg h⁻¹ mgcat.⁻¹ and Faradaic efficiency of 52.92 ± 1.83% for eNRR.
  • Demonstrated superior performance in a Zn-N₂ battery with a peak power density of 5.40 mW cm⁻².
  • Elucidated the catalytic mechanism through in situ FTIR and DFT studies.

Conclusions:

  • The defect-rich 2D p-n heterojunction strategy is effective for designing advanced eNRR catalysts.
  • Interface and defect engineering are key to creating dual-active sites for enhanced ammonia synthesis.
  • The developed catalyst shows significant potential for both ammonia production and energy storage applications under ambient conditions.