Mg+10%TiFe1-xCrx(x=0,0.3)复相合金的储氢特性

采用高能机械球磨法制备了Mg 10%TiFe1-xCrx(x=0,0.3)复相储氢合金,对比研究了球磨复相合金和球磨纯镁的微结构与储氢性能.研究结果表明:在纯Mg中添加质量分数为10%的TiFe1-xCrx(x=0,0.3)进行复合球磨,可以明显提高其吸放氢性能;在相同温度条件下,x=0.3的含铬复相合金具有最佳的吸放氢性能,其中在613 K下的吸氢容量(氢的质量分数)为7.14%,放氢容量(氢的质量分数)为6.91%;在493～573 K的较低温度下,含铬复相合金表现出更好的放氢动力学性能.通过XRD、SEM、EDS分析研究表明,TiFe1-xCrx(x=0,0.3)合金粉以细小颗粒的形式分散镶嵌在镁粉基体上成为催化活性点,改善了体系的吸放氢性能.

Hydrogen Storage Properties of Mg+10% TiFe1-xCrx(x=0,0.3) Multi-Phase Alloys

Mg 10%TiFe1-xCrx(x=0,0.3) multi-phase alloys and pure magnesium were composed by high energy mechanical milling,and their hydrogen storage characteristics were investigated comparatively.The result shows that the hydrogen storage properties increase remarkably after pure magnesium ball-milled with 10% TiFe1-xCrx(x=0,0.3).Moreover,the chromium content also influences the hydrogen storage characteristics.Furthermore,the ball-milled composite of Mg 10%TiFe0.7Cr0.3 has the best hydrogen storage properties with hydrogenation capacity(mass fraction) of 7.14 % and dehydrogenation capacity of 6.91% at 613 K.In addition,at the lower temperature of 493-573 K,the Cr-contained composite exhibits the best dehydrogenating kinetics.The analysis with X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy dispersive spectrometer(EDS) indicates that the fine TiFe1-xCrx particles distribute on the surface of magnesium base,acting as some catalysis sites,which improves the hydrogenating and dehydrogenating properties.