Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material

doi:10.1007/s40195-016-0387-0

Abstract

Abstract:

The structure, the morphology and the thermal, optical and the surface properties of nanocrystalline CeO₂doped with Mn have been studied by X-ray diffraction (XRD), field-emission transmission electron microscopy (FE-TEM), energy-dispersive X-ray analysis, thermogravimetric analysis, UV-Vis absorption spectroscopy and Fourier transform infrared spectroscopy. The XRD results confirmed the successful incorporation of Mn into the CeO₂ lattice through the formation of nanoscale face-centered cubic solid solution. The FE-TEM observations supported the nanocrystalline nature of the solid solutions. The presence of structural defects and their role on the band gap have been discussed on the basis of absorption spectral studies. The structural differences correlate with results from temperature-programmed reaction (TPR) experiments with H₂ consumption. The TPR measurements showed an enhanced bulk reduction at much lower temperatures, indicating increased oxygen mobility in the samples, which enable to enhanced oxygen diffusion at lower temperatures.

Key words: Cerium oxide nanoparticle, Manganese, Band gap energy, Redox property

Anees A. Ansari, Joselito P. Labis, Manawwer Alam, Shahid M. Ramay, Naushad Ahmad, Asif Mahmood. Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(3): 265-273.

Figures/Tables 8

Fig. 1 X-ray diffraction patterns of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 2 TEM images of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 3 EDX of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 4 Thermogravimetric analysis of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 5 FTIR spectra of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 6 UV-Vis absorption spectra of a CeO2:Mn2%, b CeO2:Mn4% and c CeO2:Mn7% nanoparticles

Fig. 7 Plot of (αhν)2 versus photon energy (hν) of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

Fig. 8 Temperature-programmed reduction spectra of a CeO2:Mn2%, b CeO2:Mn4%, c CeO2:Mn7% nanoparticles

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