Hitachi Review

Studies on Degradation Mechanism of Electrocatalysts for Fuel Cells through In-situ SEM/STEM Observation

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Electrode catalysts play a crucial role as the key determinant of the performance of fuel cells, a technology recognized as being central to the wider adoption of hydrogen-based energy. Electrode catalysts are composed of platinum nanoparticles distributed on a carbon support, and this carbon is known to degrade at high voltage due to oxidation. This article describes a technique for assessing catalyst durability through in-situ observation under an SEM/STEM in a controlled atmosphere. The technique introduces air to create an oxidizing atmosphere and performs in-situ observation of the degradation process. Simultaneous SEM/STEM observation identified the sinking of platinum particles due to carbon oxidization as one of the degradation mechanisms. This direct observation of this degradation process will provide a valuable analytical technique for the future design of materials with high durability.

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ABOUT THE AUTHORS

Akari Hayashi, Ph.D.

Professor, Ph.D. in Chemistry, International Research Center for Hydrogen Energy, Kyushu University.

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