Synthesis and photocatalytic performance of yttrium-doped CeO2 with a porous broom-like hierarchical structure

Abstract

In this study, yttrium-doped CeO2 with a broom-like porous hierarchical structure was successfully prepared by a simple template-free hydrothermal method with cerium nitrate hexahydrate and yttrium nitrate hexahydrate as original materials. Through systematic experiments, the different effects of doping concentrations on characteristics of the ceria were examined in detail and the optimal doping ratio was determined simultaneously. The morphology and element distribution of the as-prepared samples were characterized by field emission scanning electron microscopy and high-resolution transmission electron microscopy. Structure information with Rietveld refined data were obtained by using an X-ray diffractometer. Intrinsic oxygen vacancy and extrinsic oxygen vacancy caused by doing were analyzed from Raman spectra. Analyses of elements and chemical valence analysis were carried out by X-ray photoelectron spectroscopy, and changes in reactive oxygen species were determined by calculation. Based on structural information, element valence states, results of hydrogen temperature-programmed reduction and oxygen temperature-programmed decomposition analysis and the results of photocatalytic decomposition of acetaldehyde, we can draw the conclusion that a certain amount of Y-doped CeO2 with a broom-like porous hierarchical structure has high photocatalytic activity, attributed to more oxygen vacancies and surface active oxygen species generated after yttrium doping.

CeO2/Bi2WO6 Heterostructured Microsphere with Excellent Visible‐light‐driven Photocatalytic Performance for Degradation of Tetracycline Hydrochloride

“…b). It is found that there were three sets of lattice fringes with interplanar spacings of 0.319 nm, 0.273 nm and 0.314 nm, corresponding to the (131) and (200) planes of orthorhombic Bi 2 WO 6 and the (111) plane of cubic fluorite‐type CeO 2 , respectively, which was consistent with the results of XRD. It evidently revealed that the compounds of CeO 2 and Bi 2 WO 6 were formed in the microspheres.…”

Synthesis and photocatalytic performance of yttrium-doped CeO2 with a hollow sphere structure

“…The shift at ~460 cm -1 can be assigned to F2g vibration of the fluorite-type structure and it can be considered as the symmetric stretching mode of oxygen atoms around cerium ions, and the molecule retains its tetrahedral symmetry throughout. Based on the results of previous studies and our own studies [43][44][45], a weak and less prominent band near ~600…”

“…When the number of oxygen vacancies is larger, the oxygen ion mobility becomes higher. Transportation mobility of lattice oxygen ions is beneficial for the separation of photogenerated electrons and holes [43][44][45]. In another word, the recombination of photogenerated electrons and holes is restricted at a higher oxygen vacancy.…”

“…The main fabrication methods are hydrothermal methods with surfactants and modifying agents. Our group has fabricated yttrium-doped ceria with hedgehog-like [43] and porous broom-like [44][45] hierarchical structures by using a template-free hydrothermal process.…”

Excellent near‐UV emission and room‐temperature ferromagnetism of square‐like nano‐CeO 2 mingled with Ce(OH) 3 synthesised by a hydrothermal method

“…2 a shows the Ce3 d XPS spectrum and its fitted deconvolutions of the as‐synthesised nanoparticles. The peaks located at 881.85, 888.43, 897.58, 900.03, 907.53, and 916.99 eV are attributed to Ce 4+ ions, while those at 883.99 and 903.10 eV are the characteristic peaks of Ce 3+ [7]. This result implies that both Ce 4+ and Ce 3+ ions coexist, and there are surface Ce 4+ /Ce 3+ pairs in the CeO 2 nanocolumns.…”