Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites
Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron micro...
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| Autor*in: |
LI, Xia [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2013transfer abstract |
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| Umfang: |
7 |
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| Übergeordnetes Werk: |
Enthalten in: Lack of integrated solutions hinders environmental recovery in China - 2013transfer abstract, Beijing |
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| Übergeordnetes Werk: |
volume:31 ; year:2013 ; number:7 ; pages:694-700 ; extent:7 |
| Links: |
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| DOI / URN: |
10.1016/S1002-0721(12)60344-5 |
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| 520 | |a Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). | ||
| 520 | |a Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). | ||
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10.1016/S1002-0721(12)60344-5 doi GBVA2013017000017.pica (DE-627)ELV022151079 (ELSEVIER)S1002-0721(12)60344-5 DE-627 ger DE-627 rakwb eng 610 610 DE-600 690 VZ 610 VZ 44.85 bkl LI, Xia verfasserin aut Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). amorphous Elsevier hydrogen storage materials Elsevier electrochemical properties Elsevier ball-milling Elsevier rare earths Elsevier ZHAO, Dongliang oth ZHANG, Yanghuan oth XU, Jianyi oth ZHANG, Guofang oth ZHANG, Yin oth Enthalten in Elsevier Lack of integrated solutions hinders environmental recovery in China 2013transfer abstract Beijing (DE-627)ELV011726873 volume:31 year:2013 number:7 pages:694-700 extent:7 https://doi.org/10.1016/S1002-0721(12)60344-5 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.85 Kardiologie Angiologie VZ AR 31 2013 7 694-700 7 045F 610 |
| spelling |
10.1016/S1002-0721(12)60344-5 doi GBVA2013017000017.pica (DE-627)ELV022151079 (ELSEVIER)S1002-0721(12)60344-5 DE-627 ger DE-627 rakwb eng 610 610 DE-600 690 VZ 610 VZ 44.85 bkl LI, Xia verfasserin aut Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). amorphous Elsevier hydrogen storage materials Elsevier electrochemical properties Elsevier ball-milling Elsevier rare earths Elsevier ZHAO, Dongliang oth ZHANG, Yanghuan oth XU, Jianyi oth ZHANG, Guofang oth ZHANG, Yin oth Enthalten in Elsevier Lack of integrated solutions hinders environmental recovery in China 2013transfer abstract Beijing (DE-627)ELV011726873 volume:31 year:2013 number:7 pages:694-700 extent:7 https://doi.org/10.1016/S1002-0721(12)60344-5 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.85 Kardiologie Angiologie VZ AR 31 2013 7 694-700 7 045F 610 |
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10.1016/S1002-0721(12)60344-5 doi GBVA2013017000017.pica (DE-627)ELV022151079 (ELSEVIER)S1002-0721(12)60344-5 DE-627 ger DE-627 rakwb eng 610 610 DE-600 690 VZ 610 VZ 44.85 bkl LI, Xia verfasserin aut Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). amorphous Elsevier hydrogen storage materials Elsevier electrochemical properties Elsevier ball-milling Elsevier rare earths Elsevier ZHAO, Dongliang oth ZHANG, Yanghuan oth XU, Jianyi oth ZHANG, Guofang oth ZHANG, Yin oth Enthalten in Elsevier Lack of integrated solutions hinders environmental recovery in China 2013transfer abstract Beijing (DE-627)ELV011726873 volume:31 year:2013 number:7 pages:694-700 extent:7 https://doi.org/10.1016/S1002-0721(12)60344-5 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.85 Kardiologie Angiologie VZ AR 31 2013 7 694-700 7 045F 610 |
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10.1016/S1002-0721(12)60344-5 doi GBVA2013017000017.pica (DE-627)ELV022151079 (ELSEVIER)S1002-0721(12)60344-5 DE-627 ger DE-627 rakwb eng 610 610 DE-600 690 VZ 610 VZ 44.85 bkl LI, Xia verfasserin aut Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). amorphous Elsevier hydrogen storage materials Elsevier electrochemical properties Elsevier ball-milling Elsevier rare earths Elsevier ZHAO, Dongliang oth ZHANG, Yanghuan oth XU, Jianyi oth ZHANG, Guofang oth ZHANG, Yin oth Enthalten in Elsevier Lack of integrated solutions hinders environmental recovery in China 2013transfer abstract Beijing (DE-627)ELV011726873 volume:31 year:2013 number:7 pages:694-700 extent:7 https://doi.org/10.1016/S1002-0721(12)60344-5 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.85 Kardiologie Angiologie VZ AR 31 2013 7 694-700 7 045F 610 |
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10.1016/S1002-0721(12)60344-5 doi GBVA2013017000017.pica (DE-627)ELV022151079 (ELSEVIER)S1002-0721(12)60344-5 DE-627 ger DE-627 rakwb eng 610 610 DE-600 690 VZ 610 VZ 44.85 bkl LI, Xia verfasserin aut Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites 2013transfer abstract 7 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). amorphous Elsevier hydrogen storage materials Elsevier electrochemical properties Elsevier ball-milling Elsevier rare earths Elsevier ZHAO, Dongliang oth ZHANG, Yanghuan oth XU, Jianyi oth ZHANG, Guofang oth ZHANG, Yin oth Enthalten in Elsevier Lack of integrated solutions hinders environmental recovery in China 2013transfer abstract Beijing (DE-627)ELV011726873 volume:31 year:2013 number:7 pages:694-700 extent:7 https://doi.org/10.1016/S1002-0721(12)60344-5 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA GBV_ILN_40 44.85 Kardiologie Angiologie VZ AR 31 2013 7 694-700 7 045F 610 |
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The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. 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hydrogen storage properties of mechanically milled la2mg17-x wt.%ni (x=0, 50, 100, 150 and 200) composites |
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Hydrogen storage properties of mechanically milled La2Mg17-x wt.%Ni (x=0, 50, 100, 150 and 200) composites |
| abstract |
Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). |
| abstractGer |
Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). |
| abstract_unstemmed |
Melting method was used to obtain La2Mg17 alloy, and then Ni powder was added by mechanical alloying method. The kinetics of hydriding process and electrochemical properties of La2Mg17-x wt.%Ni (x=0, 50, 100, 150, 200) composites were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that the crystal structure of composite alloy gradually transformed into amorphous phase by the effect of ball milling and Ni powders. The research of hydrogen absorption properties found that La2Mg17-50 wt.%Ni reached the highest hydrogen absorption than other alloys with more addition of Ni content, reached to 5.796 wt.% at 3 MPa, and up to 5.229 wt.% merely in 2 min, which revealed that the amorphous phase reduced the H occupation of the lattice clearance, resulting in the decline of hydrogen absorption capacity. The electrochemical tests indicated that the maximum discharge capacity increased to 353.1 mAh/g at 30 °C, however, the cycle stability decreased considerably. A series of kinetic measurements demonstrated that the controlling steps of electrochemical process of La2Mg17-x wt.%Ni alloys transferred from hydrogen diffusion on alloy bulk (x=50, 100) to hydrogen diffusion on both alloy bulk and surface (x=150, 200). |
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