CVD synthesis of boron nitride from a solid precursor
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Abstract Here we report on the studies of the controllable synthesis of large area boron nitride films by the resistive heating method on a metal substrate without using a dangerous boron and nitrogen containing gases. In our original home-made CVD setup, we used the copper foil as a metal catalytic substrate. With the solid precursor of ammonia borane, the boron nitride films were synthesized under low pressure conditions and at a growth temperature of about 1000°C. We obtained the films with an area of up to 1x1 cm 2 by varying the synthesis parameters. The quality of boron nitride films was characterized using Raman spectroscopy and X-ray spectroscopy.Keywords:
Ammonia Borane
This chapter contains sections titled: Introduction Transition Metal Nanoparticles in Catalysis Preparation, Stabilization and Characterization of Metal Nanoparticles Transition Metal Nanoparticles in Hydrogen Generation from the Hydrolysis of Ammonia Borane Durability of Catalysts in Hydrolysis of Ammonia Borane Conclusion
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Ammonia borane (AB) hydrides have been employed as disposable hydrogen (H2) sources for fuel cell applications, due to their high hydrogen capacity. In this paper, ammonia borane (AB) complex with high purity was synthesized by chemical method, using the low cost raw materials of NaBH4, CO2, and NH3. The thermal dynamic for the synthesis process is analyzed. The phase composition for the obtained ammonia borane (AB) complex powders was detected by X-ray diffraction (XRD) characterization. The results suggest that, very high purity ammonia borane (AB) complex powders were obtained, which was quite in agreement with the standard index of ammonia borane.
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Ammonia Borane
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Ammonia Borane
Cubic crystal system
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Hexagonal phase
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Highly dispersed Ni nanoparticles have been successfully immobilized by the zeolitic metal–organic framework ZIF-8 via sequential deposition–reduction methods, which show high catalytic activity and long durability for hydrogen generation from hydrolysis of aqueous ammonia borane (NH3BH3) at room temperature.
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Abstract Developing highly efficient and stable noble‐metal‐free catalysts toward catalytic hydrolysis of ammonia borane (AB) for hydrogen storage is highly desirable, but still remains challenging. We report a simple and in situ co‐reduction approach to synthesize bimetallic NiCoP nanoparticles (NPs) supported on reduced graphene oxide (rGO). Thanks to the strong electronic interaction between Ni, Co, and P, the as‐synthesized Co 89.8 Ni 10.2 P 11.7 /rGO catalyst exhibits superior catalytic performance towards hydrolysis of AB, with the turnover frequency value (TOF) of 18.6 min −1 , which is about 2.5 times higher than that of NiCo/rGO.
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Intensive efforts have been devoted to the development of new materials for safe and efficient hydrogen storage. Among them, ammonia-borane appears to be a promising candidate due to its high gravimetric hydrogen storage capacity. Ammonia-borane can release hydrogen on hydrolysis in aqueous solution under mild conditions in the presence of a suitable catalyst. Herein, we report the synthesis of ruthenium(0) nanoparticles stabilized by dihydrogenphosphate anions with an average particle size of 2.9 ± 0.9 nm acting as a water-dispersible nanocatalyst in the hydrolysis of ammonia-borane. They provide an initial turnover frequency (TOF) value of 80 min-1 in hydrogen generation from the hydrolysis of ammonia-borane at room temperature. Moreover, the high stability of these ruthenium(0) nanoparticles makes them long-lived and reusable nanocatalysts for the hydrolysis of ammonia-borane. They provide 56,800 total turnovers and retain ~80% of their initial activity even at the fifth catalytic run in the hydrolysis of ammonia-borane at room temperature.
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