A novel synthesis method of nanostructured MgO-coated hollow carbon nanofibers via CO decomposition over Mg/MgO catalyst

作者：Najafi Abolhassan^*

来源：Ceramics International, 2017, 43(12): 9220-9225.

DOI：10.1016/j.ceramint.2017.04.076

• Synthesis
• Coating
• Carbon nanofibers
• Magnesium oxide
• Catalyst
• Microstructure

An easy and one-step synthesis method for preparation of oxide-coated carbon nanofibers (CNFs) by Mg/MgO catalyst has been reported. For this purpose, the mixture of Mg (metal) and MgO (fused magnesia) powders were heat treated at 1000 degrees C under reducing atmosphere of CO gas and the final product was comprehensively characterized by various analytical methods such as X-ray diffractometry, field emission scanning electron microscopy (FE-SEM), transition electron microscopy (TEM) and Raman spectroscopy. The results showed the formation of hollow CNFs with the average diameter and wall thickness of 100 nm and 25 nm, respectively. Furthermore, SEM micrographs have obviously revealed the presence of highly packed MgO nanoparticles (with average particle size of 30 nm) on the outer surface of fibers owing to catalytic reaction of Mg 0.0 and CO gasses. Considering the superior physical properties of the synthesized oxide-coated material such as great packing, high uniformity as well as the absence of structural defects, oxide-coated CNFs showed considerable enhancement in the oxidation resistance compared to the conventional carbon nanofibers. The synthesized oxide coated CNFs showed a weight loss of less than 5 wt% after exposing to high temperature at oxidative atmosphere highlighting the significant effect of the oxide coating. This effect was confirmed by a thermoanalytical technique using differential scanning calorimeter equipped with the online gas analyzer.

• 出版日期2017-8-15