A Comparison of Ammonia Borane Dehydrogenation Methods for Proton-Exchange-Membrane Fuel Cell Vehicles: Hydrogen Yield and Ammonia Formation and Its Removal

Hydrolysis of Ammonia Borane on a Single Pt Atom Supported by N-Doped Graphene

The hydrolysis of ammonia borane (NH₃BH₃ or AB) at room temperature is a promising method to produce hydrogen, but the complete reaction mechanism is still less investigated. Herein, the full hydrolysis process of the AB molecule on single Pt atom coordinated by two carbon atoms and one nitrogen atom (Pt₁-C₂N₁) on nitrogen doped graphene is investigated using the density functional theory (DFT) method. Our results demonstrate that the rate-limiting step is the formation of *BH₂NH₃ by breaking the first B-H bond in AB with an energy barrier of 0.68 eV, implying that Pt₁-C₂N₁ is a potential room-temperature catalyst for the full hydrolysis of AB. In addition, 27 more types of M₁-C₂N₁ (M represents transiton metal atom) and Pt₁ supported on nitrogen-doped graphene with different local coordination environments (Pt₁-C_xN_y, x and y are the number of carbon and nitrogen atoms that coordinated with the platinum atom) are considered to screen out potential single-atom catalysts for AB hydrolysis. The screening results further show that Pt₁-C₁N₂ is another potential catalyst for AB hydrolysis. In particular, two hydrogen atoms precovered on Pt₁-C₁N₂, resulting in a lower energy barrier for the rate-limiting step than that on Pt₁-C₂N₁. This study provides a prototype of Pt₁-C₁N₂ and Pt₁-C₂N₁ for catalytic full hydrolysis of AB at room temperature.

Complete assignment of the vibrational spectra of borazine: the inorganic benzene

Borazine continues to be relevant in industries as diverse as energy utilisation via fuel cells and as a possible route to boron nitride. Despite it having been known for almost a century, the vibrational spectroscopy of borazine is still incomplete. The inclusion of inelastic neutron scattering spectra has enabled the observation of all of the internal modes of borazine (including the infrared and Raman forbidden modes) for the first time. A complete assignment has been generated with the use of dispersion corrected DFT calculations. This has shown that the accepted ordering of the modes is incorrect in some cases and rationalised conflicting assignments in the literature.

Inelastic neutron scattering spectroscopy has detected all of the internal modes of borazine, including the infrared and Raman forbidden modes.

Quantum chemical and experimental insights for the ionic liquid facilitated thermal dehydrogenation of ethylene diamine bisborane

Ionic liquids (ILs) were screened on the basis of solubility of ethylene diamine bisborane (EDAB) using the COSMO-SAC model and LUMO–HOMO calculations. Thereafter, thermal dehydrogenation of EDAB was conducted with imidazolium-acetate based ILs.