Ikeda K, Muto S, Tatsumi K, Menjo M, Kato S, Bielmann M, Züttel A, Jensen C M, Orimo S
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Nanotechnology. 2009 May 20;20(20):204004. doi: 10.1088/0957-4484/20/20/204004. Epub 2009 Apr 23.
The dehydriding reaction of single-phase alpha- AlH3 was investigated by in situ microscopic observations combined with thermal and surface analyses. Before the dehydriding reaction, primary AlH3 particles of size 100 nm-1 microm were thought to be covered by an oxide layer with a thickness of less than 5 nm. Both the precipitation/grain-growth of metallic Al of size 1-50 nm and an increase in 'boundary space' were clearly observed inside the particles, while the morphologies of the particles covered by the layer did not change during the dehydriding reaction. This preliminary report provides fundamental information for a further study of AlH3 as a possible hydrogen storage material.
通过原位显微镜观察结合热分析和表面分析，对单相α-AlH₃的脱氢反应进行了研究。在脱氢反应之前，认为尺寸为100纳米至1微米的初级AlH₃颗粒被厚度小于5纳米的氧化层覆盖。在颗粒内部清晰地观察到了尺寸为1至50纳米的金属Al的析出/晶粒生长以及“边界空间”的增加，而在脱氢反应过程中，被该层覆盖的颗粒形态并未改变。这份初步报告为进一步研究AlH₃作为一种可能的储氢材料提供了基础信息。
