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Related Concept Videos

Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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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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Inorganic Nitrogen Assimilation01:22

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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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Light Field-Enhanced Single-Site Cu Electrocatalyst for Nitrogen Fixation.

Zhi-Qiang Zhao1, Kai Li1, Jia Liu1

  • 1Department of Chemistry, Capital Normal University, Beijing, 100048, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 15, 2023
PubMed
Summary
This summary is machine-generated.

Photo-enhancement boosts electrocatalytic nitrogen reduction to ammonia using copper single atoms on TiO2 nanosheets. This strategy significantly improves ammonia yield rates under mild conditions, offering a promising pathway for efficient nitrogen fixation.

Keywords:
Cu single atoms supported TiO 2 nanosheetsactivation mechanismelectrocatalyticlight fieldnitrogen fixation

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Area of Science:

  • Electrocatalysis
  • Materials Science
  • Photochemistry

Background:

  • Direct electrocatalytic reduction of nitrogen (N2) to ammonia (NH3) is crucial but faces challenges in catalytic activity and efficiency.
  • Developing efficient catalysts for mild-condition N2 electroreduction remains a significant hurdle.

Purpose of the Study:

  • To develop a photo-enhanced strategy to improve the N2 electrocatalytic reduction (NRR) activity.
  • To investigate the mechanism of light-enhanced electron transfer in NRR.

Main Methods:

  • Fabrication of atomically dispersed copper single atoms supported on TiO2 nanosheets (Cu SAs/TiO2).
  • Electrochemical characterization under light irradiation and in the dark.
  • Analysis of ammonia yield rate and Faradaic efficiency.

Main Results:

  • Cu SAs/TiO2 achieved a Faradaic Efficiency of 12.88% and an NH3 yield rate of 6.26 µg h⁻¹ mgcat⁻¹ at -0.05 V vs RHE under light.
  • The photo-enhanced strategy resulted in a fivefold higher NH3 yield rate compared to the dark condition.
  • Light irradiation improved electron transfer and surface charge accumulation on Cu sites, enhancing nitrogen fixation.

Conclusions:

  • Photo-enhancement significantly boosts the electrochemical NRR performance of Cu single-atom catalysts.
  • The study provides mechanistic insights into field-effect-enhanced electrocatalysis.
  • This work offers guidelines for designing advanced photo-enhanced electrocatalysts for N2 reduction.