Publicación: EFFECT OF MG AND CA PRECIPITATES IN THE STABILITY OF FE-MN-NI ANODES USED IN ALKALINE SEAWATER ELECTROLYSIS
Fecha
2024
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Resumen
THIS WORK INVESTIGATES THE EFFECT OF MG AND CA PRECIPITATES ON THE ELECTROCHEMICAL PERFORMANCE OF FE-MN-NI-BASED ANODES PRODUCED THROUGH POWDER METALLURGY IN SIMULATED AND REAL ALKALINE SEAWATER. THE ELECTRODES THAT EXHIBITED THE BEST PERFORMANCE IN SIMULATED SEAWATER WERE THOSE CONTAINING 60 %FE-40 %NI AND 15 %FE-15 %MN-70 %FE, BOTH WITH AN OVERPOTENTIAL FOR THE OXYGEN EVOLUTION REACTION OF 370 MV AT 10 MA/CM2 AND TAFEL SLOPES OF 45 AND 53 MV/DEC, RESPECTIVELY. HOWEVER, WHEN REAL ALKALINE SEAWATER WAS USED AS ELECTROLYTE, THE ELECTROCATALYTIC ABILITY OF THESE ELECTRODES DECREASED; THE PRESENCE OF CA2+ WAS IDENTIFIED AS A SIGNIFICANT FACTOR PROMOTING PITTING CORROSION. THE STUDY CONCLUDES THAT A COMPREHENSIVE INVESTIGATION INTO THE INDIVIDUAL EFFECT OF SEAWATER IONS ON ELECTRODE PERFORMANCE IS NECESSARY.
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Palabras clave
Seawater electrolysis, Oxygen evolution reaction, Alkaline electrolysis
