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• W2034111002 abstract "Ammonia borane (AB) has been considered as an outstanding candidate material for on-board hydrogen storage due to its high stoichiometric hydrogen content (19.6 wt %) and moderate dehydrogenation temperature. However, slow dehydrogenation kinetics below 100 °C and release of volatile byproducts (ammonia, borazine, and diborane) limited its practical applications. In this work, low-density and highly porous aromatic framework (PAF-1; BET, 4657 cm2 g–1; pore volume, 2.55 cm3 g–1) was utilized as a template for the first time to nanoconfine AB molecules. The dehydrogenation behavior of the confined AB was studied by temperature-programmed desorption mass spectrometry (TPD-MS) and pressure–composition–temperature (PCT) analyses. It was found that the AB molecules can be fully confined within the nanopores when the weight ratio of AB/PAF-1 is around 1:1. More importantly, AB started to dehydrogenate at very low temperature (around 50 °C) with the peak of 77 °C in the absence of any volatile byproducts such as ammonia, borazine, or diborane. Furthermore, about 4 wt % of hydrogen was evolved in the first 25 min at 75 °C which is 27 times higher than the pristine AB, displaying higher kinetics at low temperatures. Compared with other porous supports such as MOFs, the PAF-1 has a very low framework density because it is built up only by light C and H elements. This could significantly improve the hydrogen systemic gravimetric capacity of the AB-confined system and thus increase feasibility in practical applications." @default.
• W2034111002 created "2016-06-24" @default.
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• W2034111002 date "2012-12-03" @default.
• W2034111002 modified "2023-09-23" @default.
• W2034111002 title "Dehydrogenation of Ammonia Borane Confined by Low-Density Porous Aromatic Framework" @default.
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• W2034111002 doi "https://doi.org/10.1021/jp308066e" @default.
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