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(La1-xMgx)2(Ni0.8Co0.2)7(x = 0.125, 0.25, 0.5) alloys were synthesized from the sintered mixture of La2O3+ Ni O + Co O + Mg O in the molten CaCl2 electrolyte at 750 °C and the electrochemical hydrogen storage capacities of the synthesized alloys were