Solid-State Hydriding Mechanism in the LiBH4 + MgH2 System
The LiBH4+MgH2 system has great potential in reversible hydrogen storage for fuel cell vehicles. However, it has always been dehydrogenated and re-hydrogenated in the liquid state until recently. The solid-state hydriding and dehydriding are necessary in order to achieve hydrogen uptake and release near the ambient temperature. In this study, the solid-state hydriding mechanism of 2LiH+MgB2 mixtures has been investigated for the first time. It is found that the solid-state hydriding proceeds in two elementary steps. The first step is the ion exchange between the Mg2+ and Li+ ions in the MgB2 crystal to form an intermediate compound (Mg1-xLi2x)B2. The second step is the continuous ion exchange and simultaneous hydrogenation of (Mg1-xLi2x)B2 to form LiBH4 and MgH2. This finding is consistent with the observed diffusion-controlled hydriding kinetics.*
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 979846
- Report Number(s):
- PNNL-SA-71617; 30406; TRN: US201011%%419
- Journal Information:
- Journal of Physical Chemistry C, 114(17):8089-8098, Vol. 114, Issue 17; ISSN 1932-7447
- Country of Publication:
- United States
- Language:
- English
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