TiO_2-coated Ni powder as a new cathode material for molten carbonate fuel cells

摘要

The properties of a new cathode material of nano-sized TiO_2 -coated Ni powder for application in molten carbonate fuel cells (MCFCs) are investigated. The material is prepared by a sol-gel method. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) with energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM) and Raman spectroscopy are employed to characterize the cathode material. The nano-sized TiO_2 particles are homogenously coated on the surface of the Ni powder. A stable LiTi_(1-x)Ni_xO_2 phase is formed on the surface of the Ni powder during immersion in molten carbonate at 650 deg C. The solubility of the TiO_2-coated Ni cathode is about 50 percent lower compare with that of a pure Ni cathode.