Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy
To eliminate the adverse effects of coarse α-Mg phase on the hydrogen storage kinetics of Mg-rich alloys, element Sc with high solid solubility in α-Mg is introduced into Mg–Y–Zn alloy initiatively, which shows positive effects to enhance the hydrogen storage performance. The Sc-doping effectively e...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423015120 |
| _version_ | 1797745224559099904 |
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| author | Jiaxin Zhang Xin Ding Ruirun Chen Wenchao Cao Yong Zhang Jingjie Guo |
| author_facet | Jiaxin Zhang Xin Ding Ruirun Chen Wenchao Cao Yong Zhang Jingjie Guo |
| author_sort | Jiaxin Zhang |
| collection | DOAJ |
| description | To eliminate the adverse effects of coarse α-Mg phase on the hydrogen storage kinetics of Mg-rich alloys, element Sc with high solid solubility in α-Mg is introduced into Mg–Y–Zn alloy initiatively, which shows positive effects to enhance the hydrogen storage performance. The Sc-doping effectively enhances the dehydrogenation kinetics by motivating the formation of abundant stacking faults. The stacking faults provide the hydrogen atoms with diffusion channels to accelerate the mutual phase transformation of metal/hydride. With 1 at.% Sc substituting for Y, the apparent activation energy for dehydrogenation obtains a 11% reduction compared with Sc-free alloy. Besides, Sc-doping facilities the decomposition of YH3, which provides “electron transfer” effect to accelerate the decomposition of MgH2. Sc-doping affects the hydrogenation behavior by weakening the H2 sorption but ensuring the H atoms diffusion in Mg matrix. With the gradually substitution of Sc for Y, the developed dendrite arms make it difficult for hydrogen to diffuse deeper into the samples, resulting in large ratio of unhydrided Mg. It can be concluded that the quantity of defects within Mg and catalytic sites outside the Mg matrix are important for achieving rapid hydrogen absorption and desorption simultaneously. |
| first_indexed | 2024-03-12T15:20:19Z |
| format | Article |
| id | doaj.art-de7dc6e5b612487c88c10bf4c82e444d |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-12T15:20:19Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-de7dc6e5b612487c88c10bf4c82e444d2023-08-11T05:34:07ZengElsevierJournal of Materials Research and Technology2238-78542023-07-012552275239Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloyJiaxin Zhang0Xin Ding1Ruirun Chen2Wenchao Cao3Yong Zhang4Jingjie Guo5National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaCorresponding author. No. 92, West Dazhi Street, Harbin, Heilongjiang, 150001, China.; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaCorresponding author.; National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, ChinaTo eliminate the adverse effects of coarse α-Mg phase on the hydrogen storage kinetics of Mg-rich alloys, element Sc with high solid solubility in α-Mg is introduced into Mg–Y–Zn alloy initiatively, which shows positive effects to enhance the hydrogen storage performance. The Sc-doping effectively enhances the dehydrogenation kinetics by motivating the formation of abundant stacking faults. The stacking faults provide the hydrogen atoms with diffusion channels to accelerate the mutual phase transformation of metal/hydride. With 1 at.% Sc substituting for Y, the apparent activation energy for dehydrogenation obtains a 11% reduction compared with Sc-free alloy. Besides, Sc-doping facilities the decomposition of YH3, which provides “electron transfer” effect to accelerate the decomposition of MgH2. Sc-doping affects the hydrogenation behavior by weakening the H2 sorption but ensuring the H atoms diffusion in Mg matrix. With the gradually substitution of Sc for Y, the developed dendrite arms make it difficult for hydrogen to diffuse deeper into the samples, resulting in large ratio of unhydrided Mg. It can be concluded that the quantity of defects within Mg and catalytic sites outside the Mg matrix are important for achieving rapid hydrogen absorption and desorption simultaneously.http://www.sciencedirect.com/science/article/pii/S2238785423015120Hydrogen storageMagnesium hydrideSc-dopingStacking faults |
| spellingShingle | Jiaxin Zhang Xin Ding Ruirun Chen Wenchao Cao Yong Zhang Jingjie Guo Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy Journal of Materials Research and Technology Hydrogen storage Magnesium hydride Sc-doping Stacking faults |
| title | Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy |
| title_full | Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy |
| title_fullStr | Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy |
| title_full_unstemmed | Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy |
| title_short | Achievement in modifying dehydrogenation kinetics for Sc-containing Mg matrix in Mg–Y–Zn alloy |
| title_sort | achievement in modifying dehydrogenation kinetics for sc containing mg matrix in mg y zn alloy |
| topic | Hydrogen storage Magnesium hydride Sc-doping Stacking faults |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423015120 |
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