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Poster Communications Year : 2022

Are MAX phases good candidates for doping Mg hydrogen storage?


Mn+1AXn phases (where n = 1 to 3, M is a transition metal, A is an A-group element and X is nitrogen and/or carbon) are a promising class of nanolayered compounds with a wide range of applications [1]. They combine properties of both ceramics and metals, among which excellent resistance to corrosion and high thermal conductivity. MAX phases have a layered structure with a hexagonal lattice (space group: P63/mmc) of high c/a (> 3). After etching of the A element, they become the precursor of exfoliated layers of carbides and nitrides named MXenes [2]. A few studies have proven MAX phases, Ti3AlC2 in particular, to be efficient and stable catalysers to the reversible sorption kinetics of ball-milled MgH2 [3,4]. Isothermal kinetics show a shift from a contracting volume model fit to a nucleation and growth model fit, due to MAX phase doping. Interestingly, nuclear applications motivated the use of MAX phase coatings to prevent H permeation at higher temperatures. [5] Nanosized grains behold better hydrogen sorption kinetics than their polycrystalline counterpart. Ball- milling is generally used to refine the microstructure, however producing pyrophoric powder particles. Comparatively, other severe plastic deformation (SPD) techniques like surface mechanical attrition treatment (SMAT) [6] or high pressure torsion (HPT) [7] enable microstructural tailoring on bulk materials. Our ongoing study compares three Mg-MAX composites, based on Ti2AlC, Ti3AlC2 and Ti3SiC2 [8]. Both SMAT and HPT are carried out to refine the Mg grain size and include several lattice defects. A special attention is given to the microstructural characterisation in order, in a near future, to explicitly determine the role of microstructural features and catalyser distribution in hydrogen sorption kinetics. In SMAT products, the MAX phases remain distributed around precursor powder particles, resulting in a potential hydrogen diffusion mesh which has been entirely mapped by X-ray tomography. Activation is expected at the surface deformed by SMAT, consistent with the grain size gradient [9]. In HPT products, ~100nm MAX phase particles are homogeneously redistributed within the bulk Mg. [1] M.W. Barsoum, T. El-Raghy, American Scientist 89 (2001) 334–343. [2] L. Verger, V. Natu, M. Carey, M.W. Barsoum, Trends in Chemistry 1 (2019) 656–669. [3] K. Wang, H. Du, Z. Wang, M. Gao, H. Pan, Y. Liu, International Journal of Hydrogen Energy 42 (2017) 4244–4251. [4] A.M. Lakhnik, I.M. Kirian, A.D. Rud, International Journal of Hydrogen Energy 47 (2022) 7274–7280. [5] C. Chen, C. Xu, F. Li, Y. Tan, H. Zhang, S. Peng, Journal of Nuclear Materials 476 (2016) 77–81. [6] T. Grosdidier, M. Novelli, Materials Transactions 60 (2019) 1344–1355. [7] K. Edalati, E. Akiba, Z. Horita, Science and Technology of Advanced Materials 19 (2018) 185–193. [8] W. Yu, X. Pi, W. Chen, M. Vallet, A. Guitton, L. Zhang, Materials Science and Engineering A 826 (2021) 141961. [9] K. Edalati, M. Novelli, S. Itano, H.W. Li, E. Akiba, Z. Horita, T. Grosdidier, Journal of Alloys and Compounds 737 (2018) 337–346.
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hal-03680770 , version 1 (29-05-2022)


  • HAL Id : hal-03680770 , version 1


Adrien Heinzelmeier, Xavier Sauvage, Thierry Grosdidier, Antoine Guitton. Are MAX phases good candidates for doping Mg hydrogen storage?. 2nd journées plénières de la fédération de recherche hydrogène (FRH2), May 2022, Aussois, France. . ⟨hal-03680770⟩
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