2020/04/30 by Erika Michela Dematteis, Fermín Cuevas, Fermin Cuevas +2
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Alloy #Analytical Chemistry (journal) #Catalysis and Hydrodesulfurization Studies #Chemistry #Crystallography #Electron microprobe #Hydrogen #Hydrogen Storage and Materials #Hydrogen storage #Inorganic chemistry #Intermetallic #Magnesium Alloys: Properties and Applications #Materials science #Metallurgy #Organic chemistry #Phase (matter) #Substitution (logic) #cond-mat.mtrl-sci
paper · pdf · doi:10.1016/j.jallcom.2020.156075
published as Journal of Alloys and Compounds Volume 851, 15 January 2021, 156075 Journal of Alloys and Compounds, Volume 851, 15 January 2021, 156075 · 25 pages, 4 Tables, 4 Figures, 5 ESI Figures, 1 ESI Table
openalex publication_date 2020/06/21 · arxiv created 2020/10/26 · arxiv updated 2020/10/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The present study investigates the partial substitutions of Mn and Cu for Fe in the TiFe-system to gain better understanding of the role of elemental substitution on its hydrogen storage properties. The TiFe0.88-xMn0.02Cux (x = 0, 0.02, 0.04) compositions were studied. From X-Ray Diffraction (XRD) and Electron Probe Micro-Analysis (EPMA), it was found that all alloys are multi-phase, with TiFe as a major phase, together with \beta-Ti and Ti4Fe2O-type as secondary precipitates, of all them containing also Mn and Cu. Increasing the Cu content augments the secondary phase amounts. Low quantity of secondary phases helps the activation of the main TiFe phase for the first hydrogen absorption, but on increasing their amounts, harsher activation occurs. Both Mn and Cu substitutions increase the cell parameter of TiFe, thus decreasing the first plateau pressure. However, Cu substitution rises the second plateau pressure revealing the predominancy of electronic effects associated to this substitution. All samples have fast kinetics and high hydrogen capacity making these substituted compounds promising for large scale stationary applications.