Boron-Based Hydrogen Storage: Ternary Borides and Beyond

Vajo, John J.

doi:10.2172/1326069

Title: Boron-Based Hydrogen Storage: Ternary Borides and Beyond

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Abstract

DOE continues to seek reversible solid-state hydrogen materials with hydrogen densities of ≥11 wt% and ≥80 g/L that can deliver hydrogen and be recharged at moderate temperatures (≤100 °C) and pressures (≤100 bar) enabling incorporation into hydrogen storage systems suitable for transportation applications. Boron-based hydrogen storage materials have the potential to meet the density requirements given boron’s low atomic weight, high chemical valance, and versatile chemistry. However, the rates of hydrogen exchange in boron-based compounds are thus far much too slow for practical applications. Although contributing to the high hydrogen densities, the high valance of boron also leads to slow rates of hydrogen exchange due to extensive boron-boron atom rearrangements during hydrogen cycling. This rearrangement often leads to multiple solid phases occurring over hydrogen release and recharge cycles. These phases must nucleate and react with each other across solid-solid phase boundaries leading to energy barriers that slow the rates of hydrogen exchange. This project sought to overcome the slow rates of hydrogen exchange in boron-based hydrogen storage materials by minimizing the number of solid phases and the boron atom rearrangement over a hydrogen release and recharge cycle. Two novel approaches were explored: 1) developing matched pairs of ternary borides andmore »« less

Authors:

Vajo, John J. ^[1]

HRL Laboratories, LLC, Malibu, CA (United States)

Publication Date:: Thu Apr 28 00:00:00 EDT 2016

Research Org.:: HRL Laboratories, LLC, Malibu, CA (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Contributing Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Missouri, St. Louis, MO (United States)

OSTI Identifier:: 1326069

Report Number(s):: DOE-HRL-0006630

DOE Contract Number:: EE0006630

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 08 HYDROGEN

Citation Formats


                    Vajo, John J. Boron-Based Hydrogen Storage: Ternary Borides and Beyond.  United States: N. p., 2016. 
        Web.  doi:10.2172/1326069.

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                    Vajo, John J. Boron-Based Hydrogen Storage: Ternary Borides and Beyond.  United States.  https://doi.org/10.2172/1326069

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                    Vajo, John J. 2016.  
        "Boron-Based Hydrogen Storage: Ternary Borides and Beyond".  United States.  https://doi.org/10.2172/1326069.  https://www.osti.gov/servlets/purl/1326069.

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@article{osti_1326069,

  title        = {Boron-Based Hydrogen Storage: Ternary Borides and Beyond},

  author       = {Vajo, John J.},

  abstractNote = {DOE continues to seek reversible solid-state hydrogen materials with hydrogen densities of ≥11 wt% and ≥80 g/L that can deliver hydrogen and be recharged at moderate temperatures (≤100 °C) and pressures (≤100 bar) enabling incorporation into hydrogen storage systems suitable for transportation applications. Boron-based hydrogen storage materials have the potential to meet the density requirements given boron’s low atomic weight, high chemical valance, and versatile chemistry. However, the rates of hydrogen exchange in boron-based compounds are thus far much too slow for practical applications. Although contributing to the high hydrogen densities, the high valance of boron also leads to slow rates of hydrogen exchange due to extensive boron-boron atom rearrangements during hydrogen cycling. This rearrangement often leads to multiple solid phases occurring over hydrogen release and recharge cycles. These phases must nucleate and react with each other across solid-solid phase boundaries leading to energy barriers that slow the rates of hydrogen exchange. This project sought to overcome the slow rates of hydrogen exchange in boron-based hydrogen storage materials by minimizing the number of solid phases and the boron atom rearrangement over a hydrogen release and recharge cycle. Two novel approaches were explored: 1) developing matched pairs of ternary borides and mixed-metal borohydrides that could exchange hydrogen with only one hydrogenated phase (the mixed-metal borohydride) and only one dehydrogenated phase (the ternary boride); and 2) developing boranes that could release hydrogen by being lithiated using lithium hydride with no boron-boron atom rearrangement.},

  doi          = {10.2172/1326069},

  url          = {https://www.osti.gov/biblio/1326069},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Apr 28 00:00:00 EDT 2016},

  month        = {Thu Apr 28 00:00:00 EDT 2016}

}

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