Microstructure, thermodynamics and electrochemicalproperties of novel RE (NiAlCu)x(x= 4.5, 4.9, 5.6 ) microcrystalline hydrogen-storage alloy powder prepared by gas atomization wasinvestigated. It indicates that alloy...Microstructure, thermodynamics and electrochemicalproperties of novel RE (NiAlCu)x(x= 4.5, 4.9, 5.6 ) microcrystalline hydrogen-storage alloy powder prepared by gas atomization wasinvestigated. It indicates that alloyparticles show relatively regularspherical. Microstructure is composed of the AB5 matrix phase andeutectic double-phase structure withthe AB5 phase and Ni3Al along grainboundaries when x = 5. 6, there is acoexistent structure consisting ofAB5 phase and eutectic doublephase with AB3 and AB phases along grain boundaries at x= 4.5.When x is increased to 4.9, themixed structures are composed ofAB5 and a few AB phases in discontinuous network distribution. Theelectrochemical capacity of alloy is210~300 mAh·g-1, and the activated periods are only 1~3 times.lt seems to be ascribed to the appearance of a great number of freshsurfaces within powder particles resulting from the as-quenched microcrack along the interphase boundaries within particles propagatinggradually in the process of hydrogen-absorption-and dissociation dueto the intrinsic double-phase structure.展开更多
In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electr...In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.展开更多
It has been shown that Pd<sub>35</sub>Zr<sub>65</sub> amorphous alloy has a great capability of hydrogen-storage in practice. We know little about the sites of hydrogen atoms and the hydrogen-s...It has been shown that Pd<sub>35</sub>Zr<sub>65</sub> amorphous alloy has a great capability of hydrogen-storage in practice. We know little about the sites of hydrogen atoms and the hydrogen-storage quantity in the amorphous alloy. The possible sites of H atoms and the maximum hydrogen-storage quantity will be discussed in this note by means of the rhomb unit structure model （RUSM）.展开更多
文摘Microstructure, thermodynamics and electrochemicalproperties of novel RE (NiAlCu)x(x= 4.5, 4.9, 5.6 ) microcrystalline hydrogen-storage alloy powder prepared by gas atomization wasinvestigated. It indicates that alloyparticles show relatively regularspherical. Microstructure is composed of the AB5 matrix phase andeutectic double-phase structure withthe AB5 phase and Ni3Al along grainboundaries when x = 5. 6, there is acoexistent structure consisting ofAB5 phase and eutectic doublephase with AB3 and AB phases along grain boundaries at x= 4.5.When x is increased to 4.9, themixed structures are composed ofAB5 and a few AB phases in discontinuous network distribution. Theelectrochemical capacity of alloy is210~300 mAh·g-1, and the activated periods are only 1~3 times.lt seems to be ascribed to the appearance of a great number of freshsurfaces within powder particles resulting from the as-quenched microcrack along the interphase boundaries within particles propagatinggradually in the process of hydrogen-absorption-and dissociation dueto the intrinsic double-phase structure.
文摘In order to improve the cycling stability of La-Mg-Ni-Co hydrogen storage alloys, the La0.7Mg0.3 （Ni0.85Co0.15）3.5 alloy was prepared by inductive melting under argon atmosphere. The effect of additive CoO on electrochemical properties of La0.7Mg0.3（Ni0.85 Co0.15）3.5 alloy, which is used as an electrode material was studied. When the addition of CoO is 5 %, both the discharge capacity at high-, low- and room-tem- perature and charge-discharge cycling stability at room temperature can be significantly improved. Electro- chemical measurements and X-ray diffraction （XRD） analyses suggest that CoO improves the electrochemical properties of the La0.7Mg0.3（Ni0.85Co0.15）3.5 alloy by promoting the electrochemical reaction of another phase in the alloy and by self electrochemical reversible reaction occurring during the charge-discharge process.
基金the National Natural Science Foundation of China.
文摘It has been shown that Pd<sub>35</sub>Zr<sub>65</sub> amorphous alloy has a great capability of hydrogen-storage in practice. We know little about the sites of hydrogen atoms and the hydrogen-storage quantity in the amorphous alloy. The possible sites of H atoms and the maximum hydrogen-storage quantity will be discussed in this note by means of the rhomb unit structure model （RUSM）.
