Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn)
The A<sub>2</sub>B<sub>7</sub>-type La-Mg-Ni-M-based (M = Al, Mn) intermetallic compounds were produced by mechanical alloying and annealing. The thermodynamic and electrochemical properties of these materials were studied. The nickel substitution by aluminum and manganese in...
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MDPI AG
2020-04-01
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| Online Access: | https://www.mdpi.com/2075-4701/10/5/578 |
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| author | Marek Nowak Mateusz Balcerzak Mieczyslaw Jurczyk |
| author_facet | Marek Nowak Mateusz Balcerzak Mieczyslaw Jurczyk |
| author_sort | Marek Nowak |
| collection | DOAJ |
| description | The A<sub>2</sub>B<sub>7</sub>-type La-Mg-Ni-M-based (M = Al, Mn) intermetallic compounds were produced by mechanical alloying and annealing. The thermodynamic and electrochemical properties of these materials were studied. The nickel substitution by aluminum and manganese in the La-Mg-Ni system improves the kinetics of hydrogen absorption. The hydrogen desorption capacity of Mn substituted compounds is improved significantly, and it reaches the value of 1.79 wt.% at 303 K when the composition is La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.80</sub>Mn<sub>0.20</sub>. On the other hand, the La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.85</sub>Al<sub>0.15</sub> shows a much higher reversible electrochemical capacity than the La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7</sub> materials at the 50th cycle. The electrochemical discharge capacity stability increases with the increasing value of Al and Mn up to <i>x</i> = 0.2 and 0.3, respectively. Additionally, a reduction in the discharge capacity was measured for the Al and Mn content above <i>x</i> = 0.25 and 0.5, respectively. From the practical aspect, only La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.80</sub>Mn<sub>0.20</sub> has a potential in the application as a hydrogen storage material. |
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| spelling | doaj.art-66f6d2e1169d4889b3f55c68067e726d2023-11-19T22:58:06ZengMDPI AGMetals2075-47012020-04-0110557810.3390/met10050578Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn)Marek Nowak0Mateusz Balcerzak1Mieczyslaw Jurczyk2Institute of Materials Science and Engineering, Poznan University of Technology, Jana Pawla II 24, 61-138 Poznan, PolandInstitute of Materials Science and Engineering, Poznan University of Technology, Jana Pawla II 24, 61-138 Poznan, PolandInstitute of Materials Science and Engineering, Poznan University of Technology, Jana Pawla II 24, 61-138 Poznan, PolandThe A<sub>2</sub>B<sub>7</sub>-type La-Mg-Ni-M-based (M = Al, Mn) intermetallic compounds were produced by mechanical alloying and annealing. The thermodynamic and electrochemical properties of these materials were studied. The nickel substitution by aluminum and manganese in the La-Mg-Ni system improves the kinetics of hydrogen absorption. The hydrogen desorption capacity of Mn substituted compounds is improved significantly, and it reaches the value of 1.79 wt.% at 303 K when the composition is La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.80</sub>Mn<sub>0.20</sub>. On the other hand, the La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.85</sub>Al<sub>0.15</sub> shows a much higher reversible electrochemical capacity than the La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7</sub> materials at the 50th cycle. The electrochemical discharge capacity stability increases with the increasing value of Al and Mn up to <i>x</i> = 0.2 and 0.3, respectively. Additionally, a reduction in the discharge capacity was measured for the Al and Mn content above <i>x</i> = 0.25 and 0.5, respectively. From the practical aspect, only La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>6.80</sub>Mn<sub>0.20</sub> has a potential in the application as a hydrogen storage material.https://www.mdpi.com/2075-4701/10/5/578A<sub>2</sub>B<sub>7</sub>-type alloysthermodynamic propertieselectrochemical properties |
| spellingShingle | Marek Nowak Mateusz Balcerzak Mieczyslaw Jurczyk Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) Metals A<sub>2</sub>B<sub>7</sub>-type alloys thermodynamic properties electrochemical properties |
| title | Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) |
| title_full | Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) |
| title_fullStr | Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) |
| title_full_unstemmed | Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) |
| title_short | Effect of Substitutional Elements on the Thermodynamic and Electrochemical Properties of Mechanically Alloyed La<sub>1.5</sub>Mg<sub>0.5</sub>Ni<sub>7−<i>x</i></sub>M<i><sub>x</sub></i> alloys (M = Al, Mn) |
| title_sort | effect of substitutional elements on the thermodynamic and electrochemical properties of mechanically alloyed la sub 1 5 sub mg sub 0 5 sub ni sub 7 i x i sub m i sub x sub i alloys m al mn |
| topic | A<sub>2</sub>B<sub>7</sub>-type alloys thermodynamic properties electrochemical properties |
| url | https://www.mdpi.com/2075-4701/10/5/578 |
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