Thermal and spectroscopic (IR, NMR) studies of bulk ammonia borane - Polyethylene oxide composites: A potential hydrogen storage system

被引：0
|
作者：
Kharel, Krishna [1 ]
Fu, Riqiang [2 ]
Ingram, Emily [1 ]
Clark, Caitlyn [1 ]
Guenaydin, Ozge [1 ]
机构：
[1] Lamar Univ, Dept Chem & Biochem, Beaumont, TX 77710 USA
[2] Natl High Magnet Field Lab, 1800 E Paul Dirac Dr, Tallahassee, FL 32310 USA
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2024年 / 193卷
关键词：
Ammonia borane; Polyethylene oxide; MAS-NMR; DSC; ATR/FTIR; METAL-ORGANIC FRAMEWORK; ACTIVATION-ENERGIES; DEHYDROGENATION; RELEASE; DECOMPOSITION; GENERATION; COMPLEXES; CATALYSTS; H-2; NANOCLUSTERS;
D O I：
10.1016/j.jpcs.2024.112177
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We utilized differential scanning calorimeter (DSC), Fourier-transformed infrared spectroscopy (FT-IR), and solid-state nuclear magnetic resonance spectroscopy (NMR) techniques to understand the dehydrogenation mechanism of ammonia borane (AB) and its polymer composites. The results indicated that the polymeric composites with higher polyethylene oxide (PEO) mass ratio involve the possible breakdown of dative bond and the formation of new interaction (H-bonding) between the AB and the polymer. The activation energies were calculated in the temperature range of 25 degrees C and 300 degrees C which were found to be lower than the pristine AB. 15 N and 11 B NMR studies at room temperature showed evidence for a possible interaction, H-bonding, between AB and PEO. The NMR experiments at 85 degrees C were conducted to investigate the isothermal decomposition during several hours. Results indicated that the pristine AB takes longer incubation time, however the polymeric composite readily decomposes at 85 degrees C. Both showed proof for the formation of byproducts. Moreover, IR study showed evidence to support the interaction between AB and PEO.
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页数：10
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