Improving of hydrogen desorption kinetics of MgH2 by NaNH2 addition: Interplay between microstructure and chemical reaction(Article)
- aCenter of Excellence for Hydrogen and Renewable Energy, “Vinča” Institute of Nuclear Sciences, National Institute of Republic of Serbia, University of Belgrade, POB 522, Belgrade, 11000, Serbia
- bLaboratory for Materials Testing, Department of Production Engineering, Faculty of Technical Sciences University of Novi Sad, Trg Dositeja Obradovića 6, Novi Sad, 21000, Serbia
- cDepartment of Ecology and Techno-Economics, Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, 11000, Serbia
Abstract
MgH2 based composites combined with NaNH2 were synthesized by mechanical milling for three different milling times ranging from 15 to 60 minutes. Microstructure and particle size of the samples were analyzed by SEM microscopy while desorption properties were followed by Thermal Desorption Spectroscopy (TDS). The kinetic properties of NaNH2-MgH2 composites were investigated by isoconversional kinetic method as implemented in code developed by our group. Composites show hydrogen desorption peaks shifted to lower temperatures in comparison to mechanically modified and as received MgH2. All NaNH2-MgH2 composites show enhanced kinetics with lowered apparent activation energy (Ea) in comparison to milled MgH2. The mechanism of desorption changes from Avrami–Erofeev n = 3 for as received MgH2 to Avrami–Erofeev n = 4 for composite materials. The change from 3 to 4 can be due to the modification of the nucleation process or a change in the dimensionality of the growth. Those high values of n disregard a diffusion control as a rate limiting step. It has been shown that there is a synergistic effect on the enhanced hydrogen storage performance of chemical reaction and structural changes caused by ball milling. This can be used as a starting point for synthesis of innovative hydrogen storage materials. © 2022 Hydrogen Energy Publications LLC
Indexed keywords
| Engineering controlled terms: | Activation energyBall millingDesorptionHydrogen storageMagnesium compoundsMechanical alloyingMicrostructureMilling (machining)Particle sizeReaction kineticsSodium compounds |
|---|---|
| Engineering uncontrolled terms | Avramus – erofeev kineticDesorption kineticsDesorption propertiesHydrogen desorptionMechanical millingMgH2-NaNH2 compositeMilling timeParticles sizesSynthesisedThermal-desorption spectroscopy |
| Engineering main heading: | Kinetics |
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja | MPNTR |
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This research was financially supported by Ministry of Education, Science and Technological Development of The Republic of Serbia.
- ISSN: 03603199
- CODEN: IJHED
- Source Type: Journal
- Original language: English
- DOI: 10.1016/j.ijhydene.2022.06.302
- Document Type: Article
- Publisher: Elsevier Ltd
Milošević Govedarović, S.; Center of Excellence for Hydrogen and Renewable Energy, “Vinča” Institute of Nuclear Sciences, National Institute of Republic of Serbia, University of Belgrade, POB 522, Belgrade, Serbia;
© Copyright 2022 Elsevier B.V., All rights reserved.
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