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采用PCT(Pressure-Content-Temperature)、XRD、SEM等测试方法对掺杂不同过渡金属氧化物(TiO2,ZrO2,Cr2O3,ZnO)的NaAlH4试样的放氢性能进行研究。结果表明,掺杂TiO2和ZrO2的NaAlH4试样的放氢性能较好。此外,所研究球磨工艺明显改善了NaAlH4的放氢性能。SEM结果发现,球磨3h的Zr-NaAlH4试样效果最佳,此时粉体吸附在较大颗粒四周,随球磨时间的延长,NaAlH4粉体颗粒发生团聚。XRD结果表明,NaAlH4球磨后的结构并未发生明显变化,这说明NaAlH4具有良好的稳定性。
The hydrogen desorption properties of NaAlH4 samples doped with different transition metal oxides (TiO2, ZrO2, Cr2O3, ZnO) were investigated by pressure-content-temperature (PCT), XRD and SEM. The results show that NaAlH4 doped with TiO2 and ZrO2 has better hydrogen desorption performance. In addition, the ball milling process studied significantly improved the hydrogen desorption performance of NaAlH4. The SEM results showed that the Zr-NaAlH4 sample after ball milling for 3h had the best effect. At this time, the powder was adsorbed around the larger particles. As the milling time prolonged, the particles of NaAlH4 powder reunited. XRD results show that NaAlH4 ball milling structure did not change significantly, indicating that NaAlH4 has good stability.