Formation of catalytically active CeO2 hollow nanoparticles guided by oriented attachment

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

“…[38] 2) Hollow spheres, on the other hand, are usually microspheres with centric void composed of nanocrystals with size of a few nanometers. Without deliberate design or special treatment, the obtained hollow structures usually demonstrate a near spherical morphology, but they can be classified into several categories, based on their specific structural details.…”

“…Mn-doped CeO 2 Galvanic replacement 1) Preparation of Mn 3 O 4 particles; 2) in situ redox reaction between Ce 3+ and Mn III [116] CeO 2 Oriented attachment 1) Solvothermal treatment with a little Cu 2+ introduction; 2) direct assembly into hollow structure [38] Multishell hollow spheres CeO 2 Hard template 1) Hydrothermal adsorption of Ce 3+ ; 2) controlled calcination [67] In situ template 1) One-pot hydrothermal treatment; 2) controlled calcination [43] Nanotube CeO 2 Hard template 1) Solvothermal liquid-phase deposition on modified CNT; 2) calcination [68] Hard template 1) Synthesis of porous anodic aluminum oxide; 2) sol-gel deposition; 3) annealing; 4) NaOH etching…”

“…Obviously, these examples suggested that 3D micro-and mesoscale organizations of nanostructures can be achieved from 1D/2D/3D "oriented attachment" for building blocks with different dimensions, leading to hollow architectures with varied hierarchical levels. [38] Different flower-like CeO 2 crystals with hollow structures can also be obtained from 3D oriented-attachment mechanism. Through detailed observations, porous CeO 2 hollow NPs with size of about 75 nm were constructed with many tiny NPs.…”

Characterization of cerium dioxide nanoparticles prepared by supercritical water oxidation

“…In the last decade, many techniques for the preparation of nanoparticles were examined by researchers, including liquidphase methods, solid-state reactions, sol-gel methods, hydrothermal synthesis, laser ablation, and co-precipitation [6][7][8][9][10][11][12][13][14][15][16]. Among these methods, supercritical water oxidation (SCWO) has attracted much attention in the recent years [17][18][19][20][21][22].…”

Cover Picture: (ChemElectroChem 5/2014)

“…This manifold application potential has stimulated research interest on an efficient synthesis of CeO 2 nanostructures. Many different synthetic approaches have been described in the literature, including spray pyrolysis,10,19 thermal decomposition,20 co‐precipitation,21,22 electro‐chemical methods,23 sonochemical methods,24 solid‐state reactions,25,26 high energy ball milling,27 rf magnetron sputtering,28 sol‐gel synthesis,29 and hydrothermal reactions 30–33. Among these methods, the hydrothermal synthesis has been shown to be a simple and scalable approach towards well‐crystallized and phase‐pure CeO 2 nano‐structures.…”