Abstract
Ni5TiO7 nanowires with controllable sizes are synthesized using PEO method combined with impregnation and annealing at 1050oC in air, with adjustment of different concentrations of impregnating solution to control the dimension of nanowires. The resulting nanowires are characterized in details using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. In addition, the CO catalytic oxidation performance of the Ni5TiO7 nanowires is investigated using a fixed-bed quartz tubular reactor and an on-line gas chromatography system, indicating that the activity of this catalytic system for CO oxidation is a strong dependency upon the nanocrystal size.When the size of the Ni5TiO7 nanowires is induced from 4 μm to 50 nm, the corresponding maximum conversion temperature is lowered by ~100 oC.
Highlights
W, Co) and (CeOx, ZrO2)/TiO2/Ti coatings[15], with its obvious advantages of an easy operation, low-cost and versatility in dimension controlling and composition tailoring[16]
X-ray diffraction (XRD) is first used to examine the crystalline structures and phase purities of as-synthesized samples obtained at PEO stage and subsequent annealing
It should be noted that the assertion of the formation of amorphous Ni-containing phase can be deduced from the dome peak in the XRD pattern (Fig. 1), which results from the repeatedly heating and cooling processes under high surface temperature produced by the micro-arc discharge in the electrolytic solution[26]
Summary
W, Co) and (CeOx, ZrO2)/TiO2/Ti coatings[15], with its obvious advantages of an easy operation, low-cost and versatility in dimension controlling and composition tailoring[16]. In contrast to the predominant Ti and O constituents in initial PEO coating, the chemical compositions detected from the local nanowires are identified as Ni, Ti and O with a stoichiometric ratio close to Ni5TiO7 (Fig. 2f), further demonstrating the formation of Ni5TiO7 phase after high-temperature annealing.
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