Journal
MATERIALS
Volume 2, Issue 4, Pages 2496-2509Publisher
MDPI
DOI: 10.3390/ma2042496
Keywords
dealloying; nanoporous; palladium; hydridation
Categories
Funding
- National Science Foundation [DMR-0847693]
- American Chemical Society [43324-G10]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0847693] Funding Source: National Science Foundation
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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.
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