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Title: Hydrogenation properties of lithium and sodium hydride – closo -borate, [B 10 H 10 ] 2− and [B 12 H 12 ] 2− , composites

Journal Article · · Physical Chemistry Chemical Physics. PCCP (Print)
DOI:https://doi.org/10.1039/C7CP07776A· OSTI ID:1470579
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Center for Materials Crystallography, Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
  2. Chemistry, Combustion, and Materials Center, Sandia National Laboratories, Livermore, USA
  3. Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark

The hydrogen absorption properties of metal closo-borate metal hydride composites, M2B10H10– 8MH and M2B12H12–10MH, M = Li or Na, are studied under high hydrogen pressures to understand the formation mechanism of metal borohydrides. The hydrogen storage properties of the composites have been investigated by in-situ synchrotron radiation powder X-ray diffraction at p(H2) = 400 bar and by ex-situ hydrogen absorption measurements at p(H2) = 526 to 998 bar. The in-situ experiments reveal the formation of crystalline intermediates before metal borohydrides (MBH4) are formed. The M2B12H12–10MH (M = Li and Na) systems show no formation of the metal borohydride at T = 400 °C and p(H2) = 537 to 970 bar. 11B MAS NMR of the M2B10H10– 8MH composites reveal that the molar ratio of LiBH4 or NaBH4 and the remaining B species is 1:0.63 and 1:0.21, respectively. Solution and solid-state 11B NMR spectra reveal new intermediates with a B:H ratio close to 1:1. Our results indicate that the M2B10H10 (M = Li, Na) salts display a higher reactivity towards hydrogen in the presence of metal hydrides compared to the corresponding [B12H12]2- compounds, which represents an important step towards understanding the factors that determine the stability and reversibility of high hydrogen capacity metal borohydrides for hydrogen storage.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1470579
Alternate ID(s):
OSTI ID: 1429663; OSTI ID: 1440264; OSTI ID: 1444088
Report Number(s):
SAND-2017-11502J; SAND-2018-6006J; PPCPFQ
Journal Information:
Physical Chemistry Chemical Physics. PCCP (Print), Journal Name: Physical Chemistry Chemical Physics. PCCP (Print) Vol. 20 Journal Issue: 23; ISSN 1463-9076
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (4)

Hydrogenation properties of lithium and sodium hydride – closo -borate, $\mathrm{[B_{10}H_{10}]^{2−}$ and $[B_{12}H_{12}]^{2−}}$ , composites text January 2018
Quantitative Assessment of B−B−B, B−H b −B, and B−H t Bonds: From BH 3 to B 12 H 12 2− journal July 2019
A fleeting glimpse of the dual roles of SiB 4 in promoting the hydrogen storage performance of LiBH 4 journal January 2019
Potassium octahydridotriborate: diverse polymorphism in a potential hydrogen storage material and potassium ion conductor journal January 2019

Figures / Tables (11)


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