Hydrolysis of tetravalent cerium Ce(IV)) - A multi-spectroscopic study on nanocrystalline CeO2 formation


Hydrolysis of tetravalent cerium Ce(IV)) - A multi-spectroscopic study on nanocrystalline CeO2 formation

Ikeda-Ohno, A.; Weiss, S.; Tsushima, S.; Hennig, C.

Because of the flexibility between the tri- and tetravalent oxidation states, cerium (Ce) is known to be the only rare earth element (REE) forming a stable pure stoichiometric dioxide compound (CeO2). Owing to this chemical specificity along with the highest natural abundance of Ce among all REEs, the application of CeO2 has spread over a variety of fields. More recently, CeO2 has been employed as nanoparticles with many technological applications, which include the catalysts for harmful gas treat-ment the water gas shift reaction, electrodes for solid oxide fuel cells and a medical use as an artificial superoxide dismutase. These versatile and still emerging applications of CeO2 still require a simpler and more efficient synthetic strategy, particularly for manufacturing CeO2 nanoparticles.
The hydrolysis of tetravalent cerium (Ce(IV)) is a primary step of many wet syntheses for fabricating CeO2 nanoparticles, although all the reported synthetic methods require additional processes, such as heating, adding organic solvents or calcination, subsequent to the initial hydrolysis step to finally yield CeO2 nanoparticles. This means that understanding of the hydrolysis mechanism of Ce(IV) would be beneficial to developing a new concept for the efficient production of CeO2 nanoparticles. Based on this background, this study focuses on the systematic investigation of the hydrolysis behaviour of Ce(IV) using synchrotron-based X-ray techniques (X-ray absorption spectroscopy (XAS) and high en-ergy X-ray scattering (HEXS)), dynamic light scattering (DLS) and transmission electron microscopy (TEM).

Keywords: cerium; Ce(IV); hydrolysis; nanocrystals; XAS; HEXS; DLS; TEM

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Publ.-Id: 20980