Solid-State Hydriding Mechanism in the LiBH4 + MgH2 System
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- Solid-State Hydriding Mechanism in the LiBH4 + MgH2 System
- Shaw, Leon L.; Wan, Xuefei; Kwak, Jahun; Hu, Jian Zhi; Yang, Zhenguo
- HYDROGEN STORAGE PROPERTIES; H SYSTEM; LITHIUM BOROHYDRIDE; COMPLEX HYDRIDES; LI; MG; DESTABILIZATION; RELEASE; CARBON; BORON
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF PHYSICAL CHEMISTRY C, v.114, no.17, pp.8089 - 8098
- The LiBH4 + MgH2 system has great potential in reversible hydrogen storage for fuel cell vehicles. However, it has always been dehydrogenated and rehydrogenated in the liquid state until recently. The solid-state hydriding and dehydriding are necessary in order to achieve hydrogen uptake and release near ambient temperature. In this study, the solid-state hydriding mechanism of 2LiH + MgB2 mixtures has been investigated. 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)B-2. The second step is the continuous ion exchange and simultaneous hydrogenation of (Mg1-xLi2x)B-2 to form LiBH4 and MgH2. This finding is consistent with the observed diffusion-controlled hydriding kinetics.
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