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Synergic effects of VLi and Ti doping on hydrogen desorption on LiBH4 (010) surface: A first-principles investigation
- Source :
- International Journal of Hydrogen Energy. 42:18442-18451
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Ti-doping and Li-vacancy (VLi) crucially affect the dehydrogenation properties of LiBH4 surface. However, theoretical investigations on individual Ti or VLi could not completely explain experimental observations. In this article, we investigated the synergistic effects of co-existing Ti and VLi on the dehydrogenation properties of LiBH4 (010) surface. Our result shows mutual stabilization between Ti-dopant and Li-vacancy, implying expectable co-existence of Ti and VLi. Thermodynamic destabilization from composite Ti + VLi defect agrees with experiments better than that from single Ti or VLi. The kinetic barrier on Ti + VLi decorated surface also becomes closer to experimental result. Therefore, the co-existing Ti and VLi synergistically and crucially affect the dehydrogenation thermodynamics and kinetics on LiBH4 surface. The electronic structure further reveals strong H H, B B, and Ti B bonds as well as weakened B H bond in transition states on Ti + VLi co-existed surface, which is the main factor of low kinetic barrier.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Hydrogen bond
05 social sciences
Inorganic chemistry
Kinetics
Energy Engineering and Power Technology
02 engineering and technology
Electronic structure
021001 nanoscience & nanotechnology
Condensed Matter Physics
Kinetic energy
Transition state
chemistry.chemical_compound
Fuel Technology
chemistry
Lithium borohydride
0502 economics and business
Physical chemistry
Dehydrogenation
Density functional theory
050207 economics
0210 nano-technology
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........9459e55d61ad84da5ecad29d8a54f5f1