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Macroporous Monolithic Polymers: Preparation and Applications
Materials 2009, 2(4), 2496-2509; doi:10.3390/ma2042496

Preparation and Hydrogen Absorption/Desorption of Nanoporous Palladium Thin Films

Department of Chemical and Materials Engineering, University of Kentucky, 177 F. Paul Anderson Tower, Lexington, KY 40506-0046, USA
* Author to whom correspondence should be addressed.
Received: 29 October 2009 / Revised: 18 December 2009 / Accepted: 21 December 2009 / Published: 23 December 2009
(This article belongs to the Special Issue Porous Materials)
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Nanoporous Pd (np-Pd) was prepared by co-sputtering Pd-Ni alloy films onto Si substrates, followed by chemical dealloying with sulfuric acid. X-ray diffractometry and chemical analysis were used to track the extent of dealloying. The np-Pd structure was changed from particle-like to sponge-like by diluting the sulfuric acid etchant. Using suitable precursor alloy composition and dealloying conditions, np-Pd films were prepared with uniform and open sponge-like structures, with interconnected ligaments and no cracks, yielding a large amount of surface area for reactions with hydrogen. Np-Pd films exhibited shorter response time for hydrogen absorption/desorption than dense Pd films, showing promise for hydrogen sensing.
Keywords: dealloying; nanoporous; palladium; hydridation dealloying; nanoporous; palladium; hydridation
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, W.-C.; Balk, T.J. Preparation and Hydrogen Absorption/Desorption of Nanoporous Palladium Thin Films. Materials 2009, 2, 2496-2509.

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