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In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying

Palladium is a frequently used model system for hydrogen storage. During the past few decades, particular interest was placed on the superior H-absorption properties of nanostructured Pd systems. In the present study nanoporous palladium (np-Pd) is produced by electrochemical dealloying, an electroc...

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Autores principales: Steyskal, Eva-Maria, Wiednig, Christopher, Enzinger, Norbert, Würschum, Roland
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5082345/
https://www.ncbi.nlm.nih.gov/pubmed/27826493
http://dx.doi.org/10.3762/bjnano.7.110
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author Steyskal, Eva-Maria
Wiednig, Christopher
Enzinger, Norbert
Würschum, Roland
author_facet Steyskal, Eva-Maria
Wiednig, Christopher
Enzinger, Norbert
Würschum, Roland
author_sort Steyskal, Eva-Maria
collection PubMed
description Palladium is a frequently used model system for hydrogen storage. During the past few decades, particular interest was placed on the superior H-absorption properties of nanostructured Pd systems. In the present study nanoporous palladium (np-Pd) is produced by electrochemical dealloying, an electrochemical etching process that removes the less noble component from a master alloy. The volume and electrical resistance of np-Pd are investigated in situ upon electrochemical hydrogen loading and unloading. These properties clearly vary upon hydrogen ad- and absorption. During cyclic voltammetry in the hydrogen regime the electrical resistance changes reversibly by almost 10% upon absorbing approximately 5% H/Pd (atomic ratio). By suitable loading procedures, hydrogen concentrations up to almost 60% H/Pd were obtained, along with a sample thickness increase of about 5%. The observed reversible actuation clearly exceeds the values found in the literature, which is most likely due to the unique structure of np-Pd with an extraordinarily high surface-to-volume ratio.
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spelling pubmed-50823452016-11-08 In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying Steyskal, Eva-Maria Wiednig, Christopher Enzinger, Norbert Würschum, Roland Beilstein J Nanotechnol Letter Palladium is a frequently used model system for hydrogen storage. During the past few decades, particular interest was placed on the superior H-absorption properties of nanostructured Pd systems. In the present study nanoporous palladium (np-Pd) is produced by electrochemical dealloying, an electrochemical etching process that removes the less noble component from a master alloy. The volume and electrical resistance of np-Pd are investigated in situ upon electrochemical hydrogen loading and unloading. These properties clearly vary upon hydrogen ad- and absorption. During cyclic voltammetry in the hydrogen regime the electrical resistance changes reversibly by almost 10% upon absorbing approximately 5% H/Pd (atomic ratio). By suitable loading procedures, hydrogen concentrations up to almost 60% H/Pd were obtained, along with a sample thickness increase of about 5%. The observed reversible actuation clearly exceeds the values found in the literature, which is most likely due to the unique structure of np-Pd with an extraordinarily high surface-to-volume ratio. Beilstein-Institut 2016-08-17 /pmc/articles/PMC5082345/ /pubmed/27826493 http://dx.doi.org/10.3762/bjnano.7.110 Text en Copyright © 2016, Steyskal et al. https://creativecommons.org/licenses/by/4.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Letter
Steyskal, Eva-Maria
Wiednig, Christopher
Enzinger, Norbert
Würschum, Roland
In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title_full In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title_fullStr In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title_full_unstemmed In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title_short In situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
title_sort in situ characterization of hydrogen absorption in nanoporous palladium produced by dealloying
topic Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5082345/
https://www.ncbi.nlm.nih.gov/pubmed/27826493
http://dx.doi.org/10.3762/bjnano.7.110
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