Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling
Abstract
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.
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Univ. of California, Davis, CA (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1126938
- Alternate Identifier(s):
- OSTI ID: 1251019
- Report Number(s):
- SAND-2014-0055J
Journal ID: ISSN 1359-6454; PII: S1359645414006703
- Grant/Contract Number:
- AC04-94AL85000; 826008
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: C; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 08 HYDROGEN; 36 MATERIALS SCIENCE; palladium; hydrogen; cryomilling
Citation Formats
Yang, Nancy, Yee, Joshua K., Zhang, Zhihui, Kurmanaeva, Lilia, Cappillino, Patrick, Stavila, Vitalie, Lavernia, Enrique J., and San Marchi, Chris. Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling. United States: N. p., 2014.
Web. doi:10.1016/j.actamat.2014.08.056.
Yang, Nancy, Yee, Joshua K., Zhang, Zhihui, Kurmanaeva, Lilia, Cappillino, Patrick, Stavila, Vitalie, Lavernia, Enrique J., & San Marchi, Chris. Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling. United States. https://doi.org/10.1016/j.actamat.2014.08.056
Yang, Nancy, Yee, Joshua K., Zhang, Zhihui, Kurmanaeva, Lilia, Cappillino, Patrick, Stavila, Vitalie, Lavernia, Enrique J., and San Marchi, Chris. 2014.
"Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling". United States. https://doi.org/10.1016/j.actamat.2014.08.056. https://www.osti.gov/servlets/purl/1126938.
@article{osti_1126938,
title = {Hydrogen sorption characteristics of nanostructured Pd–10Rh processed by cryomilling},
author = {Yang, Nancy and Yee, Joshua K. and Zhang, Zhihui and Kurmanaeva, Lilia and Cappillino, Patrick and Stavila, Vitalie and Lavernia, Enrique J. and San Marchi, Chris},
abstractNote = {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.},
doi = {10.1016/j.actamat.2014.08.056},
url = {https://www.osti.gov/biblio/1126938},
journal = {Acta Materialia},
issn = {1359-6454},
number = C,
volume = 82,
place = {United States},
year = {Fri Oct 03 00:00:00 EDT 2014},
month = {Fri Oct 03 00:00:00 EDT 2014}
}
Web of Science
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