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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.
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Breaking the Performance Limit of Pure Metals for N2 Electroreduction.

Tan Zhang1,2, Zhikai Che1, Yuru Song1

  • 1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.

Angewandte Chemie (International Ed. in English)
|September 12, 2025
PubMed
Summary

A new micro/nanoengineering strategy using hollow fiber electrodes significantly boosts electrocatalytic nitrogen reduction reaction (NRR) efficiency for sustainable ammonia synthesis.

Keywords:
*N2/*H coverageElectrocatalysisHollow fiberNitrogen fixationPure metals

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Electrocatalytic nitrogen reduction reaction (NRR) is a promising route for sustainable ammonia synthesis.
  • Challenges include low N2 concentration and competing hydrogen evolution reaction (HER) on conventional catalysts.

Purpose of the Study:

  • To develop a universal micro/nanoengineering strategy to enhance NRR efficiency.
  • To address limitations of low N2 concentration and intermediate adsorption.

Main Methods:

  • Fabrication of three-phase-interface-optimized hollow fiber (HF) electrodes.
  • Utilizing Fe-based HF electrodes as a proof of concept.
  • Investigating mechanistic aspects through experimental studies.

Main Results:

  • Fe-based HF electrodes achieved NH3 yield rate of 27.1 µg h⁻¹ cm⁻² and FE of 3.5%.
  • Performance was significantly enhanced compared to planar electrodes (∼60-fold yield, ∼35-fold FE).
  • The HF architecture promoted N2 diffusion, suppressed HER, and activated N≡N bond cleavage.

Conclusions:

  • The HF electrode strategy effectively enhances local N2 enrichment and optimizes intermediate adsorption for NRR.
  • This micro/nanoengineering approach shows broad applicability across different metals (Fe, Cu, Ni).
  • The developed strategy presents a general platform for advancing sustainable ammonia electrosynthesis.