کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1553741 | 1513247 | 2013 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Shape-controlled synthesis of MnCo complex oxide nanostructures via a polyol-based precursor route and their catalytic properties Shape-controlled synthesis of MnCo complex oxide nanostructures via a polyol-based precursor route and their catalytic properties](/preview/png/1553741.png)
A polyol-based precursor route was developed to synthesize MnCo complex oxide with well-defined morphologies, in which ethylene glycol (EG) was treated with metal acetates in the presence of poly(vinyl-pyrrolidone) (PVP). By varying the reaction temperature, the as-obtained precursor was readily regulated its morphologies, which could vary from nanospheres to hierarchically stacked nanoplates. The initial molar ratio of Mn-acetate to Co-acetate in EG solution played a crucial role in determining the chemical composition of the nano/microstructured precursor. On the basis of the experimental results, a possible growth mechanism for the nanostructured precursor was proposed. MnCo2O4 and CoMn2O4 could be obtained from their precursors without changing the morphologies by a simple calcination procedure. The synthetic methodology appears to be general and promises to provide an entryway into other complex oxide materials with various nano/microstructures. As an example of potential applications, the as-obtained MnCo mixed oxide nano/microstructures were used as catalyst in CO oxidation, and the effect of the morphology and composition on catalytic activities was investigated.
► Nanostructured MnCo complex oxides were prepared by a polyol-based precursor route.
► The morphology of precursors was tunable by adjusting reaction temperatures.
► The morphology evolution was controlled by kinetically driven crystallization process.
► The composition of samples was tunable by adjusting the proportion of raw materials.
► CO catalytic oxidiate of the samples with different shapes and compositions was studied.
Journal: Superlattices and Microstructures - Volume 54, February 2013, Pages 26–38