The AB5-type alloy powder (MINi(3.6)Co(0.7)Mn(0.3)Al(0.4) prepared by melt-spinning was treated by a reducer (solution of sodium hypophosphite) to form a Ni-rich layer on the surface of the particles, which can obviously improved the activity of the quenched powder. For the treated alloy powder the discharge capacity after 2 cycles of charge-discharge reached an ideal value of 241 mA h g-1, but only 222 mA h g-1 for the non-treated alloy powder after 5 cycles of charge-discharge. AES and XPS results show that the nature of the oxide layer formed on the surface plays a key role on the activation process of the metal hydrides in alkaline solution.
Effect of sodium hypophosphite on the activation behavior of hydrogen storage alloy
Einfluß von Natriumhypophosphit auf das Aktivierungsverhalten von Legierungen zur Wasserstoffspeicherung
Titel chinesisch
Acta Metallurgica Sinica (Chinese Letters) ; 37 , 5 ; 522-526
2001
5 Seiten, 6 Bilder, 1 Tabelle, 27 Quellen
Aufsatz (Zeitschrift)
Unbekannt
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