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Primacy of lattice distortion over strain in platinum fuel cell nanoalloy catalysts
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DOI：10.1039/D5EE04563K.png)
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Abstract
En 中文
Alloying platinum with early or late transition metals enhances its intrinsic activity toward the oxygen reduction reaction for proton exchange membrane fuel cells (PEMFCs); according to strain and ligand effects. However; these alloying effects disappear following the dissolution of non-noble metal component(s) during operation; leading to PEMFC performance degradation. In this study; we investigate PtNi nanoalloys across critical stages of their development (viz. as-synthesized; post-electrochemical activation; after membrane electrode assembly fabrication; and following accelerated stress testing) using a comprehensive set of ex situ; in situ; operando; and post mortem characterization techniques; which allows assessing the contributions from alloying and structural effects. Our results reveal that local lattice distortion; rather than global strain and ligand effects; is an important factor effectively contributing to both catalytic activity and durability in PEMFC. These finding challenges conventional electrocatalyst design strategies and validates the defect-engineering strategy for advanced fuel cell applications; independently from transition metal(s) retention.
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