A Facile Template-Free Synthesis of Praseodymium-Doped Ceria Nanorods

Abstract

Pr-doped ceria solid solutions have attracted much attention as promising mixed electronic-ionic conductor and oxygen storage materials. However, little effort has been made to synthesize Pr-doped ceria with one-dimensional nanostructure. In this paper, Pr-doped ceria nanorods were prepared via a facile hydrothermal method using Pr(NO3)3, Ce(NO3)3 and NaOH as raw materials. X-ray diffraction (XRD), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED) indicated that the as-prepared Pr-doped ceria nanorods had a cubic fluorite structure, with the length around 200 ~ 400 nm and the diameters around 10 ~ 18 nm. The effect of alkaline concentration has been systematically studied and the results indicated that higher alkaline concentration was favorable for the formation of nanorods.

Fabrication and performance of Pr-doped CeO2 nanorods-impregnated Sr-doped LaMnO3–Y2O3-stabilized ZrO2 composite cathodes for intermediate temperature solid oxide fuel cells

“…This can be explained by comparing the length of the nanorods with the average pore size of the LSM-YSZ electrode. The length of the nanorods is 200-400 nm, 31 shorter than the average pore diameter, which is larger than 400 nm based on SEM images (Fig. 2a and d).…”

“…Moreover, it is reasonable to ascribe the dramatic decrease in the magnitude of the impedance after introduction of PCO nanorods to the increase in the active sites for ORR since PCO nanorods have a large specific surface area. 31 The breaking down of nanorods into nanoparticles has been demonstrated before, 40,41 with the nanorods prepared in a different way. However, the break-down temperature range shown here is consistent with the reported one, indicating a thermodynamically induced break-down process.…”

“…The preparation procedures were similar to those for PCO nanorods except that the alkali concentration was tuned to 0.01 mol l À1 . 31 The cells were also heat treated at 500 C.…”

“…Hydrothermal synthesis has been proven to be a convenient way to prepare nanopowders with different morphologies in a controlled manner. 31,32 This will help us to get an insight into the morphological effect of the additives on the performance of the electrode, which is the focus of this paper.…”

Ceria-Praseodymia Mixed Oxides: Relationships Between Redox Properties and Catalytic Activities Towards NO Oxidation to NO2 and CO-PROX Reactions

“…In this sense, one of the most interesting approaches to enhance ceria's redox behaviour is the addition of lanthanide cations in order to promote the low temperature redox response and the thermal stability. Among these elements, praseodymium, with variable oxidation states (+3/+4) deserves particular interest and, lastly, Prdoped CeO2 nanostructures are those to which more attention has been paid [2][3][4].…”