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Non-Precious Electrodes for Practical Alkaline Water Electrolysis.

Alejandro N Colli1,2, Hubert H Girault3, Alberto Battistel4

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Materials (Basel, Switzerland)
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Summary

This study advances alkaline water electrolysis for hydrogen production. Researchers developed stable, efficient catalysts using iron-group elements and stainless steel, achieving good performance under industrially relevant conditions.

Keywords:
Alkaline water electrolysisRaney-Niequilibrium potentialiR correctionstainless steel 316water splitting

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Renewable Energy

Background:

  • Water electrolysis offers a sustainable route for hydrogen production.
  • Alkaline water electrolyzers are cost-effective due to their use of non-noble materials.
  • Literature often employs conditions not representative of industrial applications.

Purpose of the Study:

  • To analyze common assumptions in water electrolysis research.
  • To develop and evaluate efficient electrocatalysts for large-scale alkaline water electrolysis.
  • To present experimental results under industrially relevant conditions.

Main Methods:

  • Analysis of literature data on reaction overpotentials for hydrogen and oxygen evolution.
  • Experimental direct-current electrolysis of concentrated potassium hydroxide solutions (30-100 °C).
  • Testing of Raney nickel cathodes and stainless steel 316L anodes in a monopolar cell.

Main Results:

  • Identified limitations in current literature experimental conditions.
  • Achieved stable performance with Raney nickel and stainless steel 316L at 75 °C for one month at 300 mA cm⁻².
  • Proposed catalysts demonstrated a total kinetic overpotential of approximately 550 mV at 75 °C and 1 A cm⁻².

Conclusions:

  • Optimized experimental conditions closer to industrial standards are crucial for realistic assessments.
  • Raney nickel and stainless steel 316L show promise as efficient and stable electrode materials for alkaline water electrolysis.
  • The developed catalysts offer a viable pathway towards cost-effective hydrogen production.