掺杂NaAlH4放氢性能的研究

采用PCT(pressure-conten-temperature)、XRD等测试方法对掺杂Ag2SO4、SrCO3、TiO2和ZnO的NaAlH4放氢性能进行研究。结果显示,掺杂TiO2的NaAlH4试样具有最大的放氢量,而掺杂SrCO3的试样放氢量最小,并且对比所有掺杂试样在第1阶段的放氢速率发现,掺杂TiO2的NaAlH4试样具有最大的放氢速率,在整个放氢性能的测试过程中,试样表现出了明显的2个分解阶段,并且在第1阶段的分解速率明显大于第2阶段。此外,掺杂TiO2和ZnO试样的XRD结果表明,掺杂试样经过30min的球磨之后,试样的晶体结构没有发生明显变化,并且没有新的物相生成,这说明NaAlH4具有很好的稳定性。

Study on the Dehydrogenation of Doped NaAlH4

The dehydrogenation properties of NaAlH4 doped with Ag2SO4, SrCO3, TiO2 and ZnO were studied by PCT (pressure-content-temperature) and XRD. The results indicate that NaAlH4 doped with TiO2 presents the largest amount of hydrogen release, comparatively, the sample doped with SrCO3 presents the least amount of hydrogen release. Compared to the rate of hydrogen release of all doped samples in the first stage, NaAlH4 doped with TiO2 shows the maximum rate of hydrogen release. In addition, all of the doped samples display an obvious two-stage dehydrogenation in the whole process of hydrogen release, and it is obvious that the dehydrogenation rate in the first stage is faster than that in the second stage. The results from XRD patterns prove that 30 min ball-milling does not cause any structure change and new phase appearing.