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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
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First-principles calculated decomposition pathways for LiBH4 nanoclusters.
Zhi-Quan Huang1, Wei-Chih Chen1, Feng-Chuan Chuang1
1Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
Scientific Reports
|May 19, 2016
Summary
Lithium borohydride (LiBH4) nanoclusters decompose differently than bulk material, forming mixed LinBn clusters. Smaller nanocluster sizes increase decomposition temperatures due to product destabilization.
Area of Science:
- Materials Science
- Computational Chemistry
- Chemical Thermodynamics
Background:
- Lithium borohydride (LiBH4) is a promising material for hydrogen storage.
- Understanding its decomposition pathways is crucial for practical applications.
- Nanocluster behavior may differ significantly from bulk properties.
Purpose of the Study:
- To investigate the thermodynamic stability and decomposition pathways of LiBH4 nanoclusters.
- To compare nanocluster decomposition with bulk LiBH4 behavior.
- To determine the influence of nanocluster size on decomposition thermodynamics.
Main Methods:
- Density-functional theory (DFT) calculations for energies and frequencies.
- Grand-canonical free-energy minimization.
- Prototype electrostatic ground-state (PEGS) and genetic algorithm (GA) for structural optimization.
- Analysis of off-stoichiometric clusters.
Main Results:
- Hydrogen release pathways in nanoclusters differ from bulk LiBH4.
- LiBH4 nanoclusters (n=2-12) decompose into mixed LinBn clusters, unlike bulk LiH and B.
- Finite size effects lead to sloping plateaus in pressure-composition isotherms.
- Decomposition temperatures increase with decreasing nanocluster size.
Conclusions:
- Nanocluster decomposition pathways are distinct from bulk LiBH4.
- Size-dependent thermodynamics significantly impact nanocluster stability and decomposition.
- The findings provide insights into hydrogen release mechanisms in nanoscale materials.
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