Abstract
This study reports the fast hydrogenation and dehydrogenation of ultra-thin discrete platinum/palladium (Pt/Pd) bimetal over nano-structured Ag islands grown on rough alumina substrate by a RF magnetron sputtering technique. The morphology of Ag nanoislands was optimized by RF magnetron sputtering and rapid thermal annealing process. Later, Pt/Pd bimetal (10/10) nm were deposited by RF magnetron sputtering on the nanostructured Ag islands. After the surface morphological optimization of Ag nanoislands, the resultant structure Pt/Pd@Ag nanoislands at alumina substrate showed a fast and enhanced hydrogenation and dehydrogenation (20/25 s), response magnitude of 2.3% (10,000 ppm), and a broad detection range of 500 to 40,000 ppm at the operating temperature of 120 °C. The superior hydrogenation and dehydrogenation features can be attributed to the hydrogen induced changes in the work function of Pt/Pd bimetal which enhances the coulomb scattering of percolated Pt/Pd@Ag nanoislands. More importantly, the atomic arrangements and synergetic effects of complex metal alloy interfacial structure on Ag nanoislands, supported by rough alumina substrate incorporate the vital role in accelerating the H2 absorption and desorption properties.
Highlights
As being one of the most extensively used gases, hydrogen has been of interest to create a great economy in the fields of clean energy transportation and system, petroleum product refining, fuel source, power generation, and energy storage [1,2,3,4]
Lots of studies and experiments were performed by researchers studying the smooth hydrogenation and dehydrogenation of various catalytic metal oxides system such as
Peng et al showed that combining Pd with Pt at nanoscale label on reduced graphene oxide enhances the hydrogenation and dehydrogenation properties where 3% hydrogen was detected at room temperature a slower response (~5 min) and recovery time (>20 min) was observed [31]
Summary
As being one of the most extensively used gases, hydrogen has been of interest to create a great economy in the fields of clean energy transportation and system, petroleum product refining, fuel source, power generation, and energy storage [1,2,3,4]. Peng et al showed that combining Pd with Pt at nanoscale label on reduced graphene oxide enhances the hydrogenation and dehydrogenation properties where 3% hydrogen was detected at room temperature a slower response (~5 min) and recovery time (>20 min) was observed [31]. These structures require a complex fabrication process along with conductive graphene derivatives which might face some agglomeration effects. The as-fabricated structure was used as to observe the resistance change for detection of hydrogenation and dehydrogenation processes
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