BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE

Au, M

Title: BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE

Full Record
Other Related Research

Abstract

Borohydrides such as LiBH{sub 4} have been studied as candidates for hydrogen storage because of their high hydrogen contents (18.4 wt% for LiBH{sub 4}). Limited success has been made in reducing the dehydrogenation temperature by adding reactants such as metals, metal oxides and metal halides. However, full rehydrogenation has not been realized because of multi-step decomposition processes and the stable intermediate species produced. It is suggested that adding second cation in LiBH{sub 4} may reduce the binding energy of B-H. The second cation may also provide the pathway for full rehydrogenation. In this work, several bimetallic borohydrides were synthesized using wet chemistry, high pressure reactive ball milling and sintering processes. The investigation found that the thermodynamic stability was reduced, but the full rehydrogenation is still a challenge. Although our experiments show the partial reversibility of the bimetallic borohydrides, it was not sustainable during dehydriding-rehydriding cycles because of the accumulation of hydrogen inert species.

Authors:: Au, M

Publication Date:: Thu Oct 21 00:00:00 EDT 2010

Research Org.:: Savannah River Site (SRS), Aiken, SC (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 991629

Report Number(s):: SRNL-STI-2010-00659
Journal ID: ISSN 0022-3654; JPCHAX; TRN: US201021%%261

DOE Contract Number:: DE-AC09-08SR22470

Resource Type:: Journal Article

Journal Name:: Journal of Physical Chemistry

Additional Journal Information:: Journal Name: Journal of Physical Chemistry; Journal ID: ISSN 0022-3654

Country of Publication:: United States

Language:: English

Subject:: 08 HYDROGEN; BINDING ENERGY; BOROHYDRIDES; CATIONS; CHEMISTRY; DEHYDROGENATION; HALIDES; HYDROGEN; HYDROGEN STORAGE; LITHIUM; MILLING; OXIDES; SINTERING; STABILITY; STORAGE; THERMODYNAMICS

Citation Formats


                    Au, M. BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE.  United States: N. p., 2010. 
        Web.

Copy to clipboard


                    Au, M. BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE.  United States.

Copy to clipboard


                    Au, M. 2010.  
        "BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE".  United States.  https://www.osti.gov/servlets/purl/991629.

Copy to clipboard


                    
@article{osti_991629,

  title        = {BIMETALLIC LITHIUM BOROHYDRIDES TOWARD REVERSIBLE HYDROGEN STORAGE},

  author       = {Au, M},

  abstractNote = {Borohydrides such as LiBH{sub 4} have been studied as candidates for hydrogen storage because of their high hydrogen contents (18.4 wt% for LiBH{sub 4}). Limited success has been made in reducing the dehydrogenation temperature by adding reactants such as metals, metal oxides and metal halides. However, full rehydrogenation has not been realized because of multi-step decomposition processes and the stable intermediate species produced. It is suggested that adding second cation in LiBH{sub 4} may reduce the binding energy of B-H. The second cation may also provide the pathway for full rehydrogenation. In this work, several bimetallic borohydrides were synthesized using wet chemistry, high pressure reactive ball milling and sintering processes. The investigation found that the thermodynamic stability was reduced, but the full rehydrogenation is still a challenge. Although our experiments show the partial reversibility of the bimetallic borohydrides, it was not sustainable during dehydriding-rehydriding cycles because of the accumulation of hydrogen inert species.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/991629},
  journal      = {Journal of Physical Chemistry},

  issn         = {0022-3654},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Oct 21 00:00:00 EDT 2010},

  month        = {Thu Oct 21 00:00:00 EDT 2010}

}

Copy to clipboard

Journal Article:

View Journal Article

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

THE STABILITY AND REVERSIBILITY OF METALLIC BOROHYDRIDES

Journal Article Au, M - Journal of Physical Chemistry

In effort to develop reversible metallic borohydrides with high hydrogen storage capacity and low dehydriding temperature, several new materials have been synthesized by modifying LiBH{sub 4} with various metal halides and hydrides. The investigation shows that the halide modification effectively reduced the dehydriding temperature through ion exchange interaction. The effective halides are TiCl{sub 3}, TiF{sub 3}, ZnF{sub 2} and AlF{sub 3}. The material LiBH{sub 4}+0.1TiF{sub 3} desorbs 3.5wt% and 8.5wt% hydrogen at 150 C and 450 C respectively. It re-absorbed 6wt% hydrogen at 500 C and 70 bar after dehydrogenation. The XRD of the rehydrided samples confirmed the formation ofmore »« less
Full Text Available
Modified borohydrides for reversible hydrogen storage

Journal Article Au, Ming - Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

In attempt to develop lithium borohydrides as the reversible hydrogen storage materials with the high capacity, the feasibility to reduce dehydrogenation temperature of the lithium borohydride and moderate rehydrogenation condition has been explored. The commercial available lithium borohydride has been modified by ball milling with metal oxides and metal chlorides as the additives. The modified lithium borohydrides release 9 wt% hydrogen starting from 473K. The dehydrided modified lithium borohydrides absorb 7-9 wt% hydrogen at 873K and 7 MPa. The additive modification reduces dehydriding temperature from 673K to 473K and moderates rehydrogenation conditions to 923K and 15 MPa. XRD and SEMmore »« less
Full Text Available
The influence of LiH and TiH₂ on hydrogen storage in MgB₂ I: Promotion of bulk hydrogenation at reduced temperature

Journal Article Snider, J.; Liu, Y.; Sawvel, A.; ... - International Journal of Hydrogen Energy

Mg(BH₄)₂ is an attractive hydrogen storage material, owing to its high gravimetric capacity of 14.9 wt %. However, the dehydrogenated material MgB₂ is very difficult to rehydrogenate, requiring excessive pressures and temperatures. Here we report the influence of LiH and TiH₂ on hydrogen storage reactions involving Bulk MgB₂ using XRD, XAS, FTIR and NMR. In ball-milled mixtures of LiH/MgB₂, the LiH loses crystallinity but remains undissociated, forming a weakly bound complex with MgB₂. The weak interactions produce minor variations in the local electronic structure at B and Mg, but do not markedly affect the underlying MgB₂ hexagonal crystal structure. Nomore »« less
https://doi.org/10.1016/j.ijhydene.2021.09.169

Full Text Available
NOVEL CATALYTIC EFFECTS OF FULLERENE FOR LIBH4 HYDROGEN UPTAKE AND RELEASE

Journal Article Wellons, M; Ragaiy Zidan, R; Polly Perseth, P - Nanotechnology

Our recent novel finding, involving a synergistic experiment and first-principles theory, shows that carbon nanostructures can be used as catalysts for hydrogen uptake/release in aluminum based complex metal hydrides (sodium alanate) and also provides an unambiguous understanding of how the catalysts work. Here we show that the same concepts can be applied to boron based complex hydride such as lithium borohydride, LiBH{sub 4}. Taking into account electronegativity and curvature effect a fullerene-LiBH{sub 4} composite demonstrates catalytic properties with not only lowered hydrogen desorption temperatures, but regenerative rehydriding at relatively lower temperature of 350 C. This catalytic effect likely originates frommore »« less
Full Text Available
MODIFIED BOROHYDRIDES FOR REVERSIBLE HYDROGEN STORAGE

Journal Article Au, Ming - Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

This paper reports the results in the effort to destabilize lithium borohydride for reversible hydrogen storage. A number of metals, metal hydrides, metal chlorides and complex hydrides were selected and evaluated as the destabilization agents for reducing dehydriding temperature and generating dehydriding-rehydriding reversibility. It is found that some additives are effective. The Raman spectroscopic analysis shows the change of B-H binding nature.
https://doi.org/10.1021/jp065490h

Full Text Available

Similar Records