Grain-growth mediated hydrogen sorption kinetics and compensation effect in single Pd nanoparticles

Svetlana Alekseeva, Michal Strach, Sara Nilsson, Joachim Fritzsche, Vladimir P. Zhdanov and Christoph Langhammer ()
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Svetlana Alekseeva: Chalmers University of Technology
Michal Strach: Chalmers University of Technology
Sara Nilsson: Chalmers University of Technology
Joachim Fritzsche: Chalmers University of Technology
Vladimir P. Zhdanov: Chalmers University of Technology
Christoph Langhammer: Chalmers University of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Grains constitute the building blocks of polycrystalline materials and their boundaries determine bulk physical properties like electrical conductivity, diffusivity and ductility. However, the structure and evolution of grains in nanostructured materials and the role of grain boundaries in reaction or phase transformation kinetics are poorly understood, despite likely importance in catalysis, batteries and hydrogen energy technology applications. Here we report an investigation of the kinetics of (de)hydriding phase transformations in individual Pd nanoparticles. We find dramatic evolution of single particle grain morphology upon cyclic exposure to hydrogen, which we identify as the reason for the observed rapidly slowing sorption kinetics, and as the origin of the observed kinetic compensation effect. These results shed light on the impact of grain growth on kinetic processes occurring inside nanoparticles, and provide mechanistic insight in the observed kinetic compensation effect.

Date: 2021
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DOI: 10.1038/s41467-021-25660-x

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