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Title: First-principles calculated decomposition pathways for LiBH4 nanoclusters

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep26056· OSTI ID:1283014
 [1];  [1];  [1];  [2];  [3]
  1. National Sun Yat-Sen Univ., Kaohsiung (Taiwan). Dept. of Physics
  2. Univ. of Missouri-St. Louis, St. Louis, MO (United States). Center for Nanoscience and Dept. of Physics and Astronomy
  3. Univ. of California Los Angeles, Los Angeles, CA (United States). Dept. of Materials Science and Engineering

Here, we analyze thermodynamic stability and decomposition pathways of LiBH4 nanoclusters using grand-canonical free-energy minimization based on total energies and vibrational frequencies obtained from density-functional theory (DFT) calculations. We consider (LiBH4)n nanoclusters with n = 2 to 12 as reactants, while the possible products include (Li)n, (B)n, (LiB)n, (LiH)n, and Li2BnHn; off-stoichiometric LinBnHm (m ≤ 4n) clusters were considered for n = 2, 3, and 6. Cluster ground-state configurations have been predicted using prototype electrostatic ground-state (PEGS) and genetic algorithm (GA) based structural optimizations. Free-energy calculations show hydrogen release pathways markedly differ from those in bulk LiBH4. While experiments have found that the bulk material decomposes into LiH and B, with Li2B12H12 as a kinetically inhibited intermediate phase, (LiBH4)n nanoclusters with n ≤ 12 are predicted to decompose into mixed LinBn clusters via a series of intermediate clusters of LinBnHm (m ≤ 4n). The calculated pressure-composition isotherms and temperature-pressure isobars exhibit sloping plateaus due to finite size effects on reaction thermodynamics. Generally, decomposition temperatures of free-standing clusters are found to increase with decreasing cluster size due to thermodynamic destabilization of reaction products.

Research Organization:
National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46433; AC02-05CH11231
OSTI ID:
1283014
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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