A Pd–Pt-based bulk nanoporous alloy with continuous solubility for hydrogen

Metal hydrides that enable reversible solute exchange with a reservoir often exhibit a miscibility gap at room temperature. Misfit strain during two-phase coexistence may then lead to degradation on repeated charging/discharging cycles. Furthermore, the miscibility gap impairs continuous and uniform composition tuning for functional applications. We explore electrochemical dealloying as a pathway to macroscopic monolithic samples of nanoporous Pd–Pt with continuous solubility for H at room temperature. The ligament size is tunable in the range of 4–40 nm, and sorption isotherms suggest a miscibility-gap critical point marginally below room temperature. With a maximum hydrogen fraction of 0.5, we demonstrate a reversible actuation strain of 3.3 % and a high cycle stability.

Subjects

Dealloying | Metal hydrides | Miscibility gap | Nanoporous | Palladium alloys

DDC Class

620.1: Engineering Mechanics and Materials Science

541: Physical; Theoretical

Funding(s)

Projekt DEAL

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

1-s2.0-S0013468625004682-main.pdf

Type

Main Article

Size

3.58 MB

Format

Adobe PDF

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A Pd–Pt-based bulk nanoporous alloy with continuous solubility for hydrogen