Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling

Yang, Nancy; Yee, Joshua K.; Zhang, Zhihui; Kurmanaeva, Lilia; Cappillino, Patrick; Stavila, Vitalie; Lavernia, Enrique J.; San Marchi, Chris

doi:10.1016/j.actamat.2014.08.056

Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling

Journal Article · Fri Oct 03 00:00:00 EDT 2014 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2014.08.056· OSTI ID:1126938

Yang, Nancy ^[1]; Yee, Joshua K. ^[2]; Zhang, Zhihui ^[2]; Kurmanaeva, Lilia ^[2]; Cappillino, Patrick ^[1]; Stavila, Vitalie ^[1]; Lavernia, Enrique J. ^[2]; San Marchi, Chris ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of California, Davis, CA (United States)

Palladium and its alloys are model systems for studying solid-state storage of hydrogen. Mechanical milling is commonly used to process complex powder systems for solid-state hydrogen storage; however, milling can also be used to evolve nanostructured powder to modify hydrogen sorption characteristics. In the present study, cryomilling (mechanical attrition milling in a cryogenic liquid) is used to produce nanostructured palladium-rhodium alloy powder. Characterization of the cryomilled Pd-10Rh using electron microscopy, X-ray diffraction, and surface area analysis reveals that (i) particle morphology evolves from spherical to flattened disk-like particles; while the (ii) crystallite size decreases from several microns to less than 100 nm and (iii) dislocation density increases with increased cryomilling time. Hydrogen absorption and desorption isotherms as well as the time scales for absorption were measured for cryomilled Pd-10Rh, and correlated with observed microstructural changes induced by the cryomilling process. In short, as the microstructure of the Pd-10Rh alloy is refined by cryomilling: (i) the maximum hydrogen concentration in the α-phase increases, (ii) the pressure plateau becomes flatter, and (iii) the equilibrium hydrogen capacity at 760 Torr increases. In addition, the rate of hydrogen absorption was reduced by an order of magnitude compared to non-cryomilled (atomized) powder.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1126938

Alternate ID(s):: OSTI ID: 22411447
OSTI ID: 1251019

Report Number(s):: SAND--2014-0055J; PII: S1359645414006703

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 82; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling

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