Surface changes on AlH3 during the hydrogen desorption
Surface changes on AlH3 during the hydrogen desorption
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DOI：
10.1063/1.3269598
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发表时间：
2010-02
影响因子：
4
通讯作者：
S. Kato;M. Bielmann;K. Ikeda;S. Orimo;A. Borgschulte;A. Züttel
中科院分区：
文献类型：
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作者：
S. Kato;M. Bielmann;K. Ikeda;S. Orimo;A. Borgschulte;A. Züttel
用原位X射线光电子能谱结合热脱附谱研究了α-AlH 3在放氢过程中的表面变化。脱氢时AlH 3表面被氧化层覆盖，脱氢速率显著增加。在这项研究中，在AlH 3上的表面氧化层的氢解吸动力学的作用进行了研究。AlH 3仅在自由表面分解成Al和H2，而不是在本体中。因此，封闭的表面氧化物层防止结晶不稳定的AlH 3分解。
Surface change of α-AlH3 during the hydrogen desorption was investigated by means of in situ x-ray photoelectron spectroscopy combined with thermal desorption spectroscopy. The surface of AlH3 covered by an oxide layer significantly changes upon hydrogen desorption and the hydrogen desorption rate increases remarkably. In this study, the role of the surface oxide layer on AlH3 in view of the hydrogen desorption kinetics was investigated. AlH3 only decomposes into Al and H2 at the free surface and not in the bulk. Therefore, a closed surface oxide layer prevents the thermodynamically unstable AlH3 from decomposition.