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SUMMARY:IMX Colloquium - High entropy alloys as versatile platforms for so
 lid-state hydrogen storage
DTSTART:20261116T131500
DTEND:20261116T141500
DTSTAMP:20261109T153745Z
UID:88059797256dcb8d354e2a39231f53e1a4c61aff4a988d7976ef64a7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Claudia Zlotea\, CRNS\, France\nHigh Entropy Alloys (HEAs)
 1 have recently shown promising potential for solid-state hydrogen storag
 e due to the high storage capacity of the corresponding metal hydride ph
 ases\, large chemical homogeneity range and tunable thermodynamics2. Man
 y high-capacity BCC HEAs\, which mostly contain early 3d and refractory m
 etals\, have been reported3. However\, the thermodynamics of these hydride
  phases and the multistep hydrogen uptake/release processes are not favora
 ble for practical applications. Further compositional optimization is requ
 ired before these alloys can be used in real-life applications. In this co
 ntext\, the main advantage of HEAs is their high chemical versatility\, wh
 ich allows their functional properties to be tuned\, primarily through the
  strategy of elemental substitutions/additions. \nThis oral contribution
  will provide an overview of the latest developments in optimizing the ch
 emical composition of BCC HEAs for hydrogen storage applications. It will
  demonstrate that the selection of the most promising HEAs involves compro
 mises relating to thermodynamics\, kinetics\, cycle life stability and hig
 h reversible capacity4. Despite the many scientific challenges posed by th
 e complex interplay of physicochemical parameters and the vast composition
 al space of HEAs\, as well as the trade-offs between several functional pr
 operties\, this presentation will propose an understanding of the struct
 ure-function relationship in these promising alloys. The impact of stru
 ctural properties\, such as long- and short-range ordering\, on the hydro
 gen sorption properties and the development of defects during cycling wil
 l also be examined5.\n\nReferences: \n1​D. B. Miracle and O. N. Senkov\
 , Acta Materialia\, 2017\, 122\, 448–511.\n2​T. R. Somo\, M. V. L
 ototskyy\, V. A. Yartys\, M. W. Davids and S. N. Nyamsi\, Journal of Ener
 gy Storage\, 2023\, 73\, 108969.\n3​L. Luo\, L. Chen\, L. Li\, S. Liu\,
  Y. Li\, C. Li\, L. Li\, J. Cui and Y. Li\, International Journal of Hydr
 ogen Energy\, 2024\, 50\, 406–430.\n4​A. Agafonov\, N. Pineda-Romero\
 , M. Witman\, V. Nassif\, G. B. M. Vaughan\, L. Lei\, S. Ling\, D. M. Gran
 t\, M. Dornheim\, M. Allendorf\, V. Stavila and C. Zlotea\, Acta Materi
 alia\, 2024\, 276\, 120086.\n5​N. Pineda Romero\, J. Grelska\, W. A. S
 ławiński\, J. Čížek\, O. Melikhova and C. Zlotea\, Journal of Allo
 ys and Compounds\, 2026\, 1057\, 186661.\n\nBio: Dr Claudia Zlotea is Di
 rector of Research at the East Paris Institute of Chemistry and Materials 
 (ICMPE) – CNRS\, France. She received a Ph.D. from the UniversityJoseph 
 Fourier\, Grenoble\, France\, in the field of Materials Science (2002). S
 he is currently developing fundamental research on metal hydride materials
  for solid-state hydrogen storage and compression. Her main research activ
 ities focus on porous materials\, composite nanomaterials\, intermetallics
  and high-entropy alloys. She is interested in thermodynamics\, local str
 ucture\, cycling stability and defect analysis in metal hydrides as well a
 s nanosizeeffects and behaviour of materials under high pressure.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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