Publication date: 15th December 2025
Catalyst materials play a crucial role in enabling sustainable hydrogen production through water electrolysis. Catalyst materials can be complex in structure, often having various crystal orientations or segregation at the nanoscale. Their effectiveness is usually evaluated based on the performance of catalyst films in devices, which gives an average performance across all structural features. Therefore, it is important to gain a fundamental understanding of what structural features provide enhanced electrocatalytic activity to enable a rational design of catalytic materials with enhanced electrocatalytic activity.
This talk will show examples of how local nano-electrochemical measurements enabled by scanning electrochemical cell microscopy (SECCM) combined with other local characterization techniques such as scanning electron microscopy, RAMAN spectroscopy, atomic force microscopy or Auger spectroscopy can be used to enable composition – structure- activity correlations. I will point out key factors to be considered when testing oxygen and hydrogen evolution reaction catalysts in SECCM, focusing on how the atmosphere used during measurements affects the recorded activity. In the second part, I will provide several examples to highlight the broad use of this approach for different catalyst materials, including oxides, intermetallics, transition metal dichalcogenides, or compositionally complex solid solutions / high entropy alloys.
Acknowledgment: The financial support was provided by the German Research Foundation CRC247 [388390466], SFB 1625 [506711657, subproject C02] and BMBF - project PrometH2eus (03HY105F).
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