1. Enhanced hydrogen absorption/desorption kinetics in MgH2: impact of the addition of transition metal complexes
- Author
-
Galey , B., Auroux , A., Sabo-Etienne , S., Grellier , M., Dhaher , S., Postole , G., IRCELYON-Approches thermodynamiques, analytiques et réactionnelles intégrées ( ATARI ), Institut de recherches sur la catalyse et l'environnement de Lyon ( IRCELYON ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique ( CNRS ), IRCELYON-Approches thermodynamiques, analytiques et réactionnelles intégrées (ATARI), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques
- Subjects
[ CHIM.CATA ] Chemical Sciences/Catalysis ,[CHIM.CATA] Chemical Sciences/Catalysis ,[SDE.ES] Environmental Sciences/Environmental and Society ,[CHIM.CATA]Chemical Sciences/Catalysis ,[SDE.ES]Environmental Sciences/Environmental and Society ,[ SDE.ES ] Environmental Sciences/Environmental and Society - Abstract
SSCI-VIDE+ATARI+BGL:AAU:GPO; National audience; One of the major challenges for the success of hydrogen economy is its safe and efficient storage [1]. Solid-state systems present the advantage of denser and safer hydrogen storage [2]. Among them, magnesium hydride is considered as a highly promising material to store hydrogen in terms of gravimetric and volumetric capacities. However, high thermodynamic stability and slow hydrogen sorption kinetics limit its practical use and the progresses made up to date are not enough to meet requirements for low temperature fuel cells applications [3]. Only few researches were made on the utilization of transition metal complexes for improving absorption/desorption properties of Mg/MgH2 system. In the present work, the impact of four transition metal complexes is studied.The samples were prepared and nanosized by planetary ball-milling. Microstructure, phase composition and morphology of commercial, nanostructured and doped MgH2 powders were fully determined by XRD and SEM-TEM. Temperature programmed techniques, TPD, TGA and DSC, were used to investigate hydrogen desorption kinetics and a PCT device allowed to perform absorption/desorption isotherms and study the reversibility of the process. The impact of doping MgH2 with different complexes on hydrogen release is presented in Figure 1. It can be seen that dehydrogenation of MgH2 is considerably improved, even when only 0.4wt% of nickel in complex form is used as activator.The role played by the transition metal complexes on (i) MgH2 nanostructuration during milling process and particles aggregation after milling, (ii) improved hydrogen adsorption/desorption kinetics, (iii) storage capacity and reversibility of the system, will be discussed.Acknowledgements: The authors kindly acknowledge the ANR (French National Research Agency) for the financial support (grant 3H2/2016)[1] ŞEC. Şener, Renewable and Sustainable Energy Reviews 2018, 2335-2342, 81.[2] A. Bakenne, International Journal of Hydrogen Energy 2016, 7744-7753, 41.[3] KL. Lim, Chemical Engineering Technology 2010, 213-226, 33.
- Published
- 2018