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Destabilizing high-capacity high entropy hydrides via earth abundant substitutions: From predictions to experimental validation

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [3];  [4];  [5];  [5];  [5];  [5];  [2];  [2];  [1]
  1. Université Paris-Est Créteil, Thiais (France); Centre National de la Recherche Scientifique (CNRS), Thiais (France). Institut de Chimie et des Matériaux Paris-Est (ICMPE)
  2. Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
  3. Centre National de la Recherche Scientifique (CNRS), Grenoble (France); Univ. of Grenoble Alpes, Grenoble (France). Institut Néel
  4. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  5. Univ. of Nottingham (United Kingdom)
The vast chemical space of high entropy alloys (HEAs) makes trial-and-error experimental approaches for materials discovery intractable and often necessitates data-driven and/or first principles computational insights to successfully target materials with desired properties. In the context of materials discovery for hydrogen storage applications, a theoretical prediction-experimental validation approach can vastly accelerate the search for substitution strategies to destabilize high-capacity hydrides based on benchmark HEAs, e.g. TiVNbCr alloys. Here, in this study, machine learning predictions, corroborated by density functional theory calculations, predict substantial hydride destabilization with increasing substitution of earth-abundant Fe content in the (TiVNb)75Cr25-xFex system. The as-prepared alloys crystallize in a single-phase bcc lattice for limited Fe content x < 7, while larger Fe content favors the formation of a secondary C14 Laves phase intermetallic. Short range order for alloys with x < 7 can be well described by a random distribution of atoms within the bcc lattice without lattice distortion. Hydrogen absorption experiments performed on selected alloys validate the predicted thermodynamic destabilization of the corresponding fcc hydrides and demonstrate promising lifecycle performance through reversible absorption/desorption. This demonstrates the potential of computationally expedited hydride discovery and points to further opportunities for optimizing bcc alloy ↔ fcc hydrides for practical hydrogen storage applications.
Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); Leverhulme Trust; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
Grant/Contract Number:
NA0003525
OSTI ID:
2512450
Report Number(s):
SAND--2024-07515J
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 276; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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