Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy
Mg<sub>2</sub>Ni-Ni-5%RE<sub><i>x</i></sub>O<sub><i>y</i></sub>(CeO<sub>2</sub>, Nd<sub>2</sub>O<sub>3</sub>, Tb<sub>4</sub>O<sub>7</sub>) composites were synthesized <i>via&...
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Journal of Materials Engineering
2019-10-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/Y2019/V47/I10/90 |
| _version_ | 1797966290445402112 |
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| author | ZHANG Guo-fang SUN Han-feng XU Jian-yi ZHANG Yang-huan |
| author_facet | ZHANG Guo-fang SUN Han-feng XU Jian-yi ZHANG Yang-huan |
| author_sort | ZHANG Guo-fang |
| collection | DOAJ |
| description | Mg<sub>2</sub>Ni-Ni-5%RE<sub><i>x</i></sub>O<sub><i>y</i></sub>(CeO<sub>2</sub>, Nd<sub>2</sub>O<sub>3</sub>, Tb<sub>4</sub>O<sub>7</sub>) composites were synthesized <i>via</i> ball milling method. The microstructure and hydrogen storage properties of the materials were analyzed systematically by XRD, SEM, EDS, the electrochemical and kinetic measurements. The results show that the crystallinities of the composites with rare earth oxides decrease, and the distribution of the rare earth oxide catalysts on the surface of alloys is uniform. The maximum discharge capacities of the composites with rare earth oxides rise evidently,the discharge capacity of the sample containing Tb<sub>4</sub>O<sub>7</sub> reaches to 871mAh·g<sup>-1</sup> at room temperature, and the composites can also keep higher cycling stability. The CeO<sub>2</sub> and Tb<sub>4</sub>O<sub>7</sub> catalysts can enhance the abilities of charge transfer on the surface of alloys, and improve the transmission rate of H atoms in the bulk of Mg<sub>2</sub>Ni alloy obviously. The rare earth oxides catalysts can also increase the gaseous hydrogen absorption capacity. The hydrogen storage capacity of the sample with Tb<sub>4</sub>O<sub>7</sub> reaches to 2.02%(mass fraction) at 250℃, which is the maximum hydrogen absorption capacity among these samples, but the hydriding rate is relatively slow at lower temperature. The catalytic effect of the rare earth oxides is mainly related to the changeable valences of the rare earth ions, that is, the more likely of the valences change of the ions, the better the catalytic activities exhibit. The catalytic activities in descending order are Tb<sub>4</sub>O<sub>7</sub>, CeO<sub>2</sub> and Nd<sub>2</sub>O<sub>3</sub>. |
| first_indexed | 2024-04-11T02:13:23Z |
| format | Article |
| id | doaj.art-d703402ea76f4e9d9bdf8f11a5549256 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:13:23Z |
| publishDate | 2019-10-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-d703402ea76f4e9d9bdf8f11a55492562023-01-03T01:48:58ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812019-10-014710909610.11868/j.issn.1001-4381.2018.000266201910000266Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloyZHANG Guo-fang0SUN Han-feng1XU Jian-yi2ZHANG Yang-huan3School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, ChinaMg<sub>2</sub>Ni-Ni-5%RE<sub><i>x</i></sub>O<sub><i>y</i></sub>(CeO<sub>2</sub>, Nd<sub>2</sub>O<sub>3</sub>, Tb<sub>4</sub>O<sub>7</sub>) composites were synthesized <i>via</i> ball milling method. The microstructure and hydrogen storage properties of the materials were analyzed systematically by XRD, SEM, EDS, the electrochemical and kinetic measurements. The results show that the crystallinities of the composites with rare earth oxides decrease, and the distribution of the rare earth oxide catalysts on the surface of alloys is uniform. The maximum discharge capacities of the composites with rare earth oxides rise evidently,the discharge capacity of the sample containing Tb<sub>4</sub>O<sub>7</sub> reaches to 871mAh·g<sup>-1</sup> at room temperature, and the composites can also keep higher cycling stability. The CeO<sub>2</sub> and Tb<sub>4</sub>O<sub>7</sub> catalysts can enhance the abilities of charge transfer on the surface of alloys, and improve the transmission rate of H atoms in the bulk of Mg<sub>2</sub>Ni alloy obviously. The rare earth oxides catalysts can also increase the gaseous hydrogen absorption capacity. The hydrogen storage capacity of the sample with Tb<sub>4</sub>O<sub>7</sub> reaches to 2.02%(mass fraction) at 250℃, which is the maximum hydrogen absorption capacity among these samples, but the hydriding rate is relatively slow at lower temperature. The catalytic effect of the rare earth oxides is mainly related to the changeable valences of the rare earth ions, that is, the more likely of the valences change of the ions, the better the catalytic activities exhibit. The catalytic activities in descending order are Tb<sub>4</sub>O<sub>7</sub>, CeO<sub>2</sub> and Nd<sub>2</sub>O<sub>3</sub>.http://jme.biam.ac.cn/CN/Y2019/V47/I10/90rare earth oxidemg<sub>2</sub>ni alloyelectrochemical propertykinetic propertycatalytic effect |
| spellingShingle | ZHANG Guo-fang SUN Han-feng XU Jian-yi ZHANG Yang-huan Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy Cailiao gongcheng rare earth oxide mg<sub>2</sub>ni alloy electrochemical property kinetic property catalytic effect |
| title | Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy |
| title_full | Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy |
| title_fullStr | Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy |
| title_full_unstemmed | Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy |
| title_short | Catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of Mg<sub>2</sub>Ni alloy |
| title_sort | catalytic effect of rare earth oxides with variable valences on hydrogen storage properties of mg sub 2 sub ni alloy |
| topic | rare earth oxide mg<sub>2</sub>ni alloy electrochemical property kinetic property catalytic effect |
| url | http://jme.biam.ac.cn/CN/Y2019/V47/I10/90 |
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