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Hydrogen-induced plasticity in nanoporous palladium.
Markus Gößler1, Eva-Maria Steyskal1, Markus Stütz2
1Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria.
Beilstein Journal of Nanotechnology
|December 29, 2018
Summary
Nanoporous palladium exhibits remarkable strain without fracture during hydrogenation due to a hydrogen-induced phase transition enabling internal-stress plasticity. This unique mechanism, driven by surface stress, allows for exceptional deformation in nanoporous materials.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Nanoporous palladium (npPd) is synthesized using electrochemical dealloying, yielding an average ligament diameter of approximately 20 nm.
- Understanding the mechanical behavior of npPd under electrochemical conditions is crucial for its application.
Purpose of the Study:
- To investigate the mechanical strain response of npPd during electrochemical hydrogenation.
- To elucidate the underlying mechanisms responsible for the observed strain behavior.
Main Methods:
- In situ dilatometry was employed to measure the mechanical strain response.
- Electrochemical hydrogenation was used to induce phase transitions in npPd.
- Critical potentials for phase transitions were determined.
Main Results:
- A hydrogen-induced phase transition from PdHβ to PdHα was identified as the cause of internal-stress plasticity.
- Nanoporous palladium demonstrated exceptionally high strains without fracture.
- A peculiar strain response was observed upon hydrogen sorption and desorption due to surface stress and plasticity.
Conclusions:
- Internal-stress plasticity, enabled by the PdHβ to PdHα transition, is key to the high strain tolerance of npPd.
- Surface stress significantly influences the strain response in nanoporous structures.
- Theoretical frameworks were developed to analyze the plastic strain response considering structural and deformation characteristics.
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