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 rehydrogenated in the liquid state until recently. The solid-state hydriding and dehydriding are necessary in order to achieve hydrogen uptake and release...

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Veröffentlicht in:	Journal of physical chemistry. C 2010-05, Vol.114 (17), p.8089-8098
Hauptverfasser:	Shaw, Leon L, Wan, Xuefei, Hu, Jian Zhi, Kwak, Ja Hun, Yang, Zhenguo
Format:	Artikel
Sprache:	eng
Schlagworte:	08 HYDROGEN 30 DIRECT ENERGY CONVERSION AMBIENT TEMPERATURE C: Energy Conversion and Storage Environmental Molecular Sciences Laboratory FUEL CELLS HYDROGEN HYDROGEN STORAGE HYDROGENATION ION EXCHANGE KINETICS MIXTURES
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container_title	Journal of physical chemistry. C
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creator	Shaw, Leon L Wan, Xuefei Hu, Jian Zhi Kwak, Ja Hun Yang, Zhenguo
description	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−x Li2x )B2. The second step is the continuous ion exchange and simultaneous hydrogenation of (Mg1−x Li2x )B2 to form LiBH4 and MgH2. This finding is consistent with the observed diffusion-controlled hydriding kinetics.
doi_str_mv	10.1021/jp1003837
format	Article
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subjects	08 HYDROGEN 30 DIRECT ENERGY CONVERSION AMBIENT TEMPERATURE C: Energy Conversion and Storage Environmental Molecular Sciences Laboratory FUEL CELLS HYDROGEN HYDROGEN STORAGE HYDROGENATION ION EXCHANGE KINETICS MIXTURES
title	Solid-State Hydriding Mechanism in the LiBH4 + MgH2 System
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