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研究了球磨添加CeO2对La2Mg17-50%(质量分数,下同)Ni复合合金的相结构和储氢性能的影响,并对合金的形貌和吸放氢性能进行了检测。XRD结果表明,球磨加入CeO2后,在La2Mg17-50%Ni合金中除了Mg2Ni和Ni相外,产生Ce Mg12相。SEM形貌图清晰地看见CeO2附在La2Mg17-50%Ni合金表面上呈白色小颗粒。吸氢动力学性能表明,加入CeO2后,使La2Mg17-50%Ni合金的最大吸氢量从3.298%增加到3.594%。添加CeO2后合金的最佳饱和吸氢温度降为200℃(3 MPa),且吸氢动力学性能提高至1 min内的吸氢量达到3.382%,是其最大吸氢量的94%。然而,CeO2在放氢过程中的积极作用并不明显。
The effect of adding CeO2 on the phase structure and hydrogen storage property of La2Mg 17-50% (mass fraction) alloy was studied. The morphology and hydrogen storage and desorption properties of the alloy were also investigated. XRD results show that CeMg12 phase is produced in La2Mg17-50% Ni alloy except for Mg2Ni and Ni phases after ball milling with CeO2. The SEM topography clearly shows that CeO2 is white small particles attached to the surface of La2Mg17-50% Ni alloy. Hydrogen absorption kinetics shows that the maximum hydrogen absorption of La2Mg17-50% Ni alloy increases from 3.298% to 3.594% after adding CeO2. The optimum hydrogen storage temperature of the CeO2 alloy was decreased to 200 ℃ (3 MPa) after addition of CeO2, and the hydrogen absorption capacity reached to 3.382% up to 1% of hydrogen absorption kinetics, which was 94% of the maximum hydrogen absorption. However, the positive effect of CeO2 on hydrogen evolution is not obvious.