Fast Hydrogenation and Dehydrogenation of Pt/Pd Bimetal Decorated over Nano-Structured Ag Islands Grown on Alumina Substrates

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.

Fabrication of composite transparent conductive electrodes based on silver nanowires

“…The overall solid surface energy values for AgNWs, AgNWs/PEDOT:PSS, and AgNWs/rGO electrodes are 72.75, 63.44, and 47.95 mN/m, respectively. The surface energies of the composite electrodes are decreased with covering AgNWs with smother layer 55 , 56 . In addition, AgNWs/rGO composite electrode with the lowest value of surface energy confirms the formation of large nano islands and thus lower surface diffusion process.…”

“…In this case, the Eq. ( 8 www.nature.com/scientificreports/ electrodes are decreased with covering AgNWs with smother layer 55,56 . In addition, AgNWs/rGO composite electrode with the lowest value of surface energy confirms the formation of large nano islands and thus lower surface diffusion process.…”

Chemical Gas Sensors: Recent Developments, Challenges, and the Potential of Machine Learning—A Review

“…[6,37,38], and noble metal catalysts (pallidum (Pd), platinum (Pt), gold (Au), silver (Ag), aluminum (Al), rhodium (Rh), etc.) [15,[39][40][41].…”

“…Additionally, bimetals/bimetal oxide core-shell structures were also studied to obtain better sensing outcomes [40,41]. Most recently, Xu et al [58] studied formaldehyde (HCHO) detection using bimetal Ag@Pt core−shell nanostructures (NSs) decorated on ZnO nanowires (NWs) by an inkjet printing method.…”