Hydrogen desorption properties of Mg thin films at room temperature

Hydrogen desorption properties of Mg thin films at room temperature
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Mg薄膜的室温放氢性能

DOI:
10.1016/j.jpowsour.2009.08.069
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发表时间:
2010-02
影响因子:
9.2
通讯作者:
--
中科院分区:
工程技术2区
文献类型:
--
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采用磁控溅射法制备的Pd-Mg-Pd薄膜在室温下可完全吸氢,在空气中可完全快速分解。我们的结构,光学和电学性质的调查给出了详细的了解脱附机制。根据光学和电化学测试结果,推导出氢扩散的总活化能为48 kJmol-1,氢扩散系数为8.0×10 - 15 cm-2s-1。通过对电阻数据的建模和模拟,解吸过程遵循形核和生长机制。小的活化能和显着的扩散动力学突出了作为车载储氢系统的适用性。
Pd–Mg–Pd thin films prepared by magnetron sputtering could absorb hydrogen entirely at room temperature and dehydrogenate completely and rapidly in ambient air. Our investigations of the structural, optical and electrical properties gave a detailed insight into the desorption mechanism. The overall activation energy and the hydrogen diffusion coefficient were deduced to be 48kJmol−1and 8.0×10−15cm2s−1based on optical and electrochemical measurements, respectively. The desorption process followed the nucleation and growth mechanism by modeling and simulating the resistance data. The small activation energy and remarkable diffusion kinetics highlighted the applicability as on-board hydrogen storage systems.
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