Browsing by Author "Vega, F."

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    Hydrogen adsorption study on nanostructured Ag-Rh films grown by supersonic cluster beam deposition
    (2023) Vega, F.; Fernandez, J.; Elgueta, S.; Cavaliere, Emanuele; Gavioli, Luca; Cabrera, A. L.
    Following recent literature work, an interesting result on hydrogen sorption by Ag-Rh clusters was reported which do not follow the common understanding of hydrogen ab-sorption in bulk alloys. Thus, nanostructured Ag-Rh films with a composition of 75% Ag-25% Rh were grown by supersonic cluster beam deposition onto microbalance quartz crystals in order to measure hydrogen absorption. The films were exposed to H-2 gas to study hydrogen absorption at different partial pressure. The Ag-Rh films were then characterized by XPS and AFM. The Ag/Rh atomic ratio was found to be 75/25 by XPS. Surface roughness was determined by AFM to be 3 nm RMS in all the films. In disagreement with the quoted literature report, no hydrogen absorption was observed in our Ag-Rh films up to 5:3 x 10(3)Pa of hydrogen pressure. The response of the balance was checked and validated by measuring hydrogen absorption on 10 and 100 nm Pd films. The hydrogen absorption by Pd yielded an atomic H/Pd ratio of similar to 0.65 in agreement with our prior measurements.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.