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为了改善Mg2Ni型合金的贮氢动力学性能,用Co部分替代合金中的Ni,用快淬技术制备了Mg2Ni1?xCox(x=0,0.1,0.2,0.3,0.4)贮氢合金。用XRD、HRTEM表征了快淬态合金的微观结构,用自动控制的Sieverts设备测试了合金的吸放氢动力学性能,用程控电池测试仪测定了合金薄带的电化学贮氢动力学。结果表明:Co替代Ni提高了Mg2Ni型合金的非晶形成能力,合金的非晶化程度随着Co含量的增加而增加。此外,Co替代Ni显著地改善了合金的贮氢动力学,当Co含量从0增加到0.4时,快淬态(15m/s)合金在5min内的吸氢饱和率从81.2%增加到84.9%,20min的放氢率从17.60%增加到64.79%,氢扩散系数从1.07×10-11cm2/s增加到2.79×10?11cm2/s,极限电流密度从46.7mA/g增加到191.7mA/g。
In order to improve the hydrogen storage kinetics of the Mg2Ni alloy, part of the Ni in the alloy was replaced by Co, and Mg2Ni1? XCox (x = 0,0.1,0.2,0.3,0.4) hydrogen storage alloys were prepared by the rapid quenching technique. The microstructure of the quenched alloy was characterized by XRD and HRTEM. The kinetics of hydrogen absorption and desorption of the alloy was tested by the Sieverts apparatus with automatic control. The kinetics of electrochemical hydrogen storage of the alloyed strip was measured by a programmed battery tester. The results show that the substitution of Co for Ni improves the amorphous formation ability of Mg2Ni alloy and the degree of amorphization increases with the increase of Co content. In addition, Co substitution Ni significantly improved the hydrogen storage kinetics of the alloy, when the Co content increases from 0 to 0.4, the hydrogen absorption saturation rate of the quenched (15m / s) alloy in 5min increases from 81.2% to 84.9% , The hydrogen release rate increased from 17.60% to 64.79% at 20min, the hydrogen diffusion coefficient increased from 1.07 × 10-11cm2 / s to 2.79 × 10-11cm2 / s, and the ultimate current density increased from 46.7mA / g to 191.7mA / g.