纳米晶复合物Mg-Ni-Cr_2O_3的吸放氢性能

Properties of hydriding and dehydriding of nanocrystalline composite of Mg-Ni-Cr_2O_3

在氢气作为保护气氛条件下 ,用机械合金化方法制备成Mg Ni Cr2 O3 纳米晶复合物。该复合物具有很好的吸放氢性能 ,在球磨过程中能发生吸氢反应 ,经过较长时间球磨之后 ,基本能完成吸氢 ,其放氢温度也有所降低。该复合材料充氢量在 2 0 0℃可以于 5 0s内达到 6 .0 %以上 ;在 30 5℃ ,0 .1MPa下 ,放氢量在 5 0 0s内可达到6 .0 %以上。对该复合物的热力学性能进行了研究 ,测出了PCT曲线及吸放氢的生成热ΔH等数据 ,并分析了其吸放氢的机理。

The properties of hydriding and dehydriding of nanocrystalline composite of Mg-Ni-Cr 2O 3 milled in hydrogen were studied. This composite can absorb hydrogen in milling process; if the milling time is enough long, the composite will absorb completely hydrogen. This composite has remarkable performance of hydriding and dehydriding, and the dehydriding temperature is low. The composite can absorb hydrogen above 6.0% within 50?s at 200?℃, and release 6.0% hydrogen within 500?s at 305?℃ under 0.1?MPa. The thermodynamics and PCT curve of the composite were investigated, and mechanism was also analyzed.