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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Nitrogen Electrocatalysis: Electrolyte Engineering Strategies to Boost Faradaic Efficiency.

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Electrolyte engineering boosts ammonia synthesis via electrochemical nitrogen reduction. Strategies in aqueous and non-aqueous electrolytes improve efficiency, overcoming challenges like hydrogen evolution and low nitrogen solubility for industrial viability.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Electrochemical nitrogen reduction to ammonia offers a sustainable alternative to the Haber-Bosch process.
  • Current methods suffer from low Faradaic efficiency (FE) and ammonia yield, hindering industrial application.
  • Key challenges in aqueous electrolytes include competing hydrogen evolution reaction (HER) and poor nitrogen solubility.

Purpose of the Study:

  • To comprehensively review electrolyte engineering strategies for enhancing electrochemical ammonia synthesis.
  • To analyze methods for improving Faradaic efficiency (FE) and ammonia yield in both aqueous and non-aqueous media.
  • To identify promising approaches for future advancements in electrochemical nitrogen reduction.

Main Methods:

  • Summarization of various electrolyte engineering strategies.
  • Analysis of modifications to electrolyte pH, proton transport, and water activity in aqueous systems.
  • Review of hybrid, water-in-salt, ionic liquid, and non-aqueous electrolyte systems.

Main Results:

  • Electrolyte modifications in aqueous media can improve performance by altering pH, proton transport, and water activity.
  • Hybrid and non-aqueous electrolytes demonstrate suppression of HER and enhanced nitrogen solubility.
  • Lithium-mediated nitrogen reduction in engineered non-aqueous electrolytes shows highly encouraging results.

Conclusions:

  • Rational electrolyte engineering is crucial for advancing electrochemical ammonia synthesis.
  • Non-aqueous and hybrid electrolytes show significant promise in overcoming current limitations.
  • Further research into engineered electrolytes is essential for achieving industrially viable ammonia production.