| 1 | Direct synthesis of La-Mg-Ni-Co type hydrogen storage alloys from oxide mixtures显示文摘(La_(1-x)Mg_x)_2(Ni_(0.8)Co_(0.2))_7(x = 0.125, 0.25, 0.5) alloys were synthesized from the sintered mixture of La_2O_3+ Ni O + Co O + Mg O in the molten CaCl_2 electrolyte at 750 °C and the electrochemical hydrogen storage capacities of the synthesized alloys were measured. Non-hygroscopic LaNiO_3 phase formed during sintering(at 1200 °C for 2 h) as a result of the reaction of hygroscopic La_2O_3 with NiO. Another sinter product was Mg_(0.4)Ni_(0.6)O phase. Both mixed oxide sinter products facilitated the La-Ni and Mg-Ni phase formations. X-ray diffraction peaks indicated that the first stable phase appeared in the alloy structure was LaNi_5 which formed upon reduction of La_2NiO_4 phase. Increase in Mg content caused formation of La_(1.5)Mg_(0.5)Ni_7 phase in the alloy structure and the presence of this phase improved the hydrogen storage performance of the electrodes. It was observed that(La_(1-x)Mg_x)_2(Ni_(0.8)Co_(0.2))_7(x = 0.125, 0.25, 0.5) alloys have promising discharge capacities change between 319 m Ah/g and 379 m Ah/g depending on the alloy Mg content. | Alanur Binal Aybar Mustafa Anik | 2017 | Journal of Energy Chemistry2017，26，4： | 3 |
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