skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Towards a viable hydrogen storage system for transportation application.

Abstract

Hydrogen energy may provide the means to an environmentally friendly future. One of the problems related to its application for transportation is 'on-board' storage. Hydrogen storage in solids has long been recognized as one of the most practical approaches for this purpose. The H-capacity in interstitial hydrides of most metals and alloys is limited to below 2.5% by weight and this is unsatisfactory for on-board transportation applications. Magnesium hydride is an exception with hydrogen capacity of {approx}8.2 wt.%, however, its operating temperature, above 350 C, is too high for practical use. Sodium alanate (NaAlH{sub 4}) absorbs hydrogen up to 5.6 wt.% theoretically; however, its reaction kinetics and partial reversibility do not completely meet the new target for transportation application. Recently Chen et al. [1] reported that (Li{sub 3} N + 2H{sub 2} {leftrightarrow} LiNH{sub 2} + 2LiH) provides a storage material with a possible high capacity, up to 11.5 wt.%, although this material is still too stable to meet the operating pressure/temperature requirement. Here we report a new approach to destabilize lithium imide system by partial substitution of lithium by magnesium in the (LiNH{sub 2 + LiH {leftrightarrow} Li2NH + H2}) system with a minimal capacity loss. This Mg-substituted materialmore » can reversibly absorb 5.2 wt.% hydrogen at pressure of 30 bar at 200 C. This is a very promising material for on-board hydrogen storage applications. It is interesting to observe that the starting material (2LiNH{sub 2 + MgH2}) converts to (Mg(NH{sub 2}){sub 2} + 2LiH) after a desorption/re-absorption cycle.« less

Authors:
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
944393
Report Number(s):
SAND2004-4375C
TRN: US200902%%744
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the International Symposium on Metal Hydrogen Systems held September 5-10, 2004 in Kracow, Poland.
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; ALLOYS; CAPACITY; HYDRIDES; HYDROGEN; HYDROGEN STORAGE; IMIDES; INTERSTITIALS; LITHIUM; MAGNESIUM; MAGNESIUM HYDRIDES; REACTION KINETICS; SODIUM; STORAGE; TARGETS

Citation Formats

Luo, Weifang. Towards a viable hydrogen storage system for transportation application.. United States: N. p., 2004. Web.
Luo, Weifang. Towards a viable hydrogen storage system for transportation application.. United States.
Luo, Weifang. Wed . "Towards a viable hydrogen storage system for transportation application.". United States.
@article{osti_944393,
title = {Towards a viable hydrogen storage system for transportation application.},
author = {Luo, Weifang},
abstractNote = {Hydrogen energy may provide the means to an environmentally friendly future. One of the problems related to its application for transportation is 'on-board' storage. Hydrogen storage in solids has long been recognized as one of the most practical approaches for this purpose. The H-capacity in interstitial hydrides of most metals and alloys is limited to below 2.5% by weight and this is unsatisfactory for on-board transportation applications. Magnesium hydride is an exception with hydrogen capacity of {approx}8.2 wt.%, however, its operating temperature, above 350 C, is too high for practical use. Sodium alanate (NaAlH{sub 4}) absorbs hydrogen up to 5.6 wt.% theoretically; however, its reaction kinetics and partial reversibility do not completely meet the new target for transportation application. Recently Chen et al. [1] reported that (Li{sub 3} N + 2H{sub 2} {leftrightarrow} LiNH{sub 2} + 2LiH) provides a storage material with a possible high capacity, up to 11.5 wt.%, although this material is still too stable to meet the operating pressure/temperature requirement. Here we report a new approach to destabilize lithium imide system by partial substitution of lithium by magnesium in the (LiNH{sub 2 + LiH {leftrightarrow} Li2NH + H2}) system with a minimal capacity loss. This Mg-substituted material can reversibly absorb 5.2 wt.% hydrogen at pressure of 30 bar at 200 C. This is a very promising material for on-board hydrogen storage applications. It is interesting to observe that the starting material (2LiNH{sub 2 + MgH2}) converts to (Mg(NH{sub 2}){sub 2} + 2LiH) after a desorption/re-absorption cycle.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {9}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: