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This study employed in operando Raman spectroscopy to investigate the redox behavior of iridium-oxygen bonds in proton exchange membrane (PEM) water electrolyzers during actual operation. The researchers observed dynamic changes in the oxidation states of iridium oxide catalysts under working conditions, revealing that the catalyst surface undergoes reversible redox transitions that correlate with the oxygen evolution reaction activity. These real-time observations provide direct evidence of the active catalyst states and degradation mechanisms occurring at the electrode surface during water splitting.
Why it matters
Understanding the dynamic behavior of iridium-based catalysts during operation is critical for improving the efficiency and durability of PEM electrolyzers, which are key technologies for green hydrogen production. These insights could guide the development of more stable and cost-effective catalysts, potentially reducing the reliance on expensive iridium while maintaining performance.
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