An Innovative Procedure to Evaluate the Hydrogen Diffusion Coefficient in Metals from Absorption Measurements

Andrea Moriani, Oriele Palumbo, Silvano Tosti, Alessia Santucci, Alfonso Pozio, Francesco Trequattrini and Annalisa Paolone
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Andrea Moriani: Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, Frascati, 00044 Rome, Italy
Oriele Palumbo: Consiglio Nazionale delle Ricerche, Istitutodei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
Silvano Tosti: Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, Frascati, 00044 Rome, Italy
Alessia Santucci: Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, Frascati, 00044 Rome, Italy
Alfonso Pozio: Dipartimento Tecnologie Energetiche, ENEA, Via Anguillarese 301, S. Maria di Galeria, 00123 Rome, Italy
Francesco Trequattrini: Consiglio Nazionale delle Ricerche, Istitutodei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
Annalisa Paolone: Consiglio Nazionale delle Ricerche, Istitutodei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy

Energies, 2019, vol. 12, issue 9, 1-13

Abstract: A large number of metallic alloys are currently under investigation in the field of hydrogen storage and hydrogen separation membranes. For such applications, the knowledge of the hydrogen diffusion coefficient in the given alloy is of great importance even if its direct measurement is not always easy to perform. In this view, the aim of this work is to describe an innovative procedure able to provide the lower limit of the hydrogen diffusion coefficient by performing hydrogen absorption kinetic experiments. Two different tools are presented: The first is a numerical code which solves the diffusion problem inside metals according to the general theory of the transport phenomena, and the second is a dimensional analysis that describes the dependence of the hydrogen diffusion coefficient from a few governing parameters. Starting from the results of several hydrogen absorption kinetic experiments performed on a Pd–Ag sample under different experimental conditions, the hydrogen diffusion coefficients were assessed by using both the described tools. A good agreement among the results obtained by means of the two procedures was observed.

Keywords: hydrogen diffusion; hydrogen absorption; numerical code; dimensional analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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