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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Fe-VS2 Electrocatalyst with Organic Matrix-Mediated Electron Transfer for Highly Efficient Nitrogen Fixation.

Ziyuan Xiu1, Ming Zheng2, Jiadong Li1

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No. 92, West Da-Zhi Street, Harbin, 150001, P. R. China.

Chemsuschem
|June 7, 2022
PubMed
Summary

Researchers developed an iron-doped VS2 nanosheet electrode for efficient electrochemical nitrogen fixation. This new catalyst converts nitrogen to ammonia with high yield and selectivity, offering a promising alternative to the Haber-Bosch process.

Keywords:
Fe dopingelectrocatalysisnanosheetsnitrogen reduction reactionorganic conductive polymers

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrochemical nitrogen fixation presents a sustainable alternative to the energy-intensive Haber-Bosch process.
  • Natural nitrogenase inspires biomimetic approaches for efficient nitrogen reduction.
  • Developing efficient electrocatalysts is crucial for ambient ammonia synthesis.

Purpose of the Study:

  • To synthesize and characterize Fe-doped VS2 nanosheets for electrocatalytic nitrogen reduction reaction (NRR).
  • To enhance electron transfer kinetics using an organic conductive polymer (1-AAQ-PA).
  • To investigate the performance of the 1-AAQ-PA-Fe-VS2 electrode for ammonia production.

Main Methods:

  • One-step solvothermal synthesis of Fe-doped VS2 nanosheets.
  • Fabrication of a composite electrode using 1-AAQ-PA and Fe-VS2.
  • Electrochemical characterization including NRR performance testing and Density Functional Theory (DFT) calculations.

Main Results:

  • The 1-AAQ-PA-Fe-VS2 electrode achieved an ammonia yield of 31.6 μg h⁻¹ mg⁻¹ at -0.35 V vs. RHE.
  • A high Faradaic efficiency of 23.5% was obtained, indicating efficient N2 conversion.
  • Fe doping enhanced N2 adsorption, while the Li-S bond suppressed hydrogen evolution; 1-AAQ-PA facilitated electron transfer.

Conclusions:

  • The Fe-doped VS2 nanosheets, coupled with 1-AAQ-PA, demonstrate significant potential for efficient electrochemical nitrogen fixation.
  • The integrated system effectively promotes N2 reduction to NH3 while minimizing competing hydrogen evolution.
  • DFT calculations confirm the preferential adsorption and reduction of N2 on Fe sites.