Ammonium
perchlorate (AP) is an oxidizer material that is widely
employed in applications ranging from rocketry to airbags. Previous
research has suggested that efficient electron transfer plays a critical
role in determining the kinetics of catalyzed AP decomposition reactions.
Consequently, intimate contact between AP crystals and electron acceptors
has the potential to accelerate decomposition kinetics, which motivates
the development of conformal coatings with suitably tailored electronic
structures. Here, we demonstrate a scalable method for conformally
coating AP crystals with two atomically well-defined 2D materials
with orthogonal electronic propertiesnamely, pristine graphene,
which is a zero-band gap semiconductor that has been shown to be an
effective electron acceptor in diverse heterojunctions and hexagonal
boron nitride (hBN), which is a wide-band gap electrical insulator.
Consistent with an electron transfer mechanism, graphene-coated AP
undergoes accelerated decomposition kinetics compared to uncoated
(neat) or hBN-coated AP. Through extensive structural characterization
including electron microscopy and X-ray diffraction, the effects of
AP crystal size and crystallinity are examined. In addition, the accelerated
decomposition kinetics of graphene-coated AP are quantified through
thermogravimetric analysis, gas chromatography mass spectrometry,
and kinetic modeling. Overall, this work establishes pristine graphene
as an effective coating for promoting accelerated decomposition of
AP, which enhances its utility in various applications.
The oxygen vacancy-enriched Fe2O3@NiO heterojunctions assembled by nanoparticles and nanosheets can be used as a highly efficient and stable dual-function electrocatalyst to achieve efficient all-water splitting.
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