Influence Of Thermal Treatment On The Structure And Electrochemical Properties Of La₁₂Ce₃Fe₁₀Ni₆₃Mn₅Al₆B Hydrogen Storage Alloy

Hydrogen storage alloy is a kind of alloy materials, which can react with hydrogen at room temperature and atmospheric pressure, and storage hydrogen in the void of crystals. This kind of alloy can release the stored hydrogen by heating or decreasing pressure and can also re-store the hydrogen by cooling or under pressure. Recent years, in order to develop hydrogen storage alloy with high-rate discharge ability (HRD) and low cost, La-Fe-B system hydrogen storage alloys have been drawn great attention.In present work, La12Ce3Fe10Ni63Mn5Al6B alloy was prepared by melting-rapid quenching technique and the effects of different thermal treatment on structural and electrochemical properties were systematically studied by XRD、SEM、EDS and electrochemical test. The structural measurement demonstrated that all the alloys are consisted of LaNi5and (Fe, Ni) phase. And the electrochemical test manifested that the quenching medium dilute acetic acid is better than concentrated alkaline for improving the performance of La12Ce3Fe10Ni63Mn5Al6B alloy, moreover, the proper quenching treatment (temperature and time) can improve platform properties and hydrogen storage capacity, and increase the discharge capacity, activation characteristics and high-rate discharge ability of the alloy electrodes, but the cycle stability of the alloy electrodes is decreased to some extent.The annealing treatment of quenching alloy can make the components more uniform and improve the activation characteristic and high-rate discharge ability of the alloy electrodes, however, the maximal discharge capacity, cycle stability and platform properties were lowered.