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Enhancing Boron Ignition Characteristics with Ti3C2Tx MXene Additives
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DOI：10.1021/acsanm.6c01688.png)
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Abstract
En 中文
A wide range of strategies and additives have been examined to improve boron ignition and oxidation to realize complete utilization of boron’s high volumetric and gravimetric energy content, but two-dimensional transition metal carbides, nitrides and carbonitrides (MXenes) remain relatively unexplored for this purpose. Here, we examine high-quality, single-to-few layer Ti3C2Tx MXene nanosheets as additives in the preparation of Ti3C2Tx MXene/boron clusters and report enhanced oxidation and ignition of these mixtures relative to neat boron. Boron with Ti3C2Tx MXene additive content as low as 1 wt % show dramatic decreases in oxidation and ignition temperatures, with the greatest improvements observed at 20 wt % Ti3C2Tx MXene loading. Differential scanning calorimetry and thermogravimetric analysis show a ∼100 °C lower oxidation onset temperature, up to 25% additional mass gain, and ∼50 °C decrease in the temperature required for boron oxide removal for the 20 wt % MXene composition relative to neat boron. Morphological and compositional characterization of the 20 wt % MXene mixture using scanning electron microscopy and energy-dispersive X-ray spectroscopy reveals 100–200 μm clusters with nearly uniform distribution of the Ti3C2Tx MXene and boron components. Determination of ignition temperature using heated wire ignition showed increased ignition reliability and decreased ignition temperatures for all compositions, with the 20 wt % MXene mixture showing ignition at as low as 333 °C.
Keywords:
Boron
Oxidation
Redox reactions
Thermodynamic properties
Two dimensional materials
Ti3C2Tx MXene
energetic materials
boron
ignition
thermal properties
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