Clean synthesis of Cu2O@CeO2 core@shell nanocubes with highly active interface

Abstract

The fabrication of multi-component hybrid nanostructures is of vital importance because their two-phase interface could provide a rich environment for redox reactions, which are beneficial for enhancing catalytic performance. Inspired by the above consideration, strongly coupled Cu 2 O@CeO 2 core@shell nanostructures have been successfully prepared via a non-organic and clean aqueous route without using any organic additive. In this process, an auto-catalytic redox reaction occurred on the two-phase interface, followed by a triggered self-assembly process. Additionally, the size, morphology and composition of the as-obtained nanostructures can be tuned well by varying the reaction temperature, as well as the species and the amount of Cu precursors. The catalytic tests for peroxidase-like activity and CO oxidation have been conducted in detail, and the results confirm a strong synergistic effect at the interface sites between the CeO 2 and Cu 2 O components.

Fabrication of CeO2–MOx (M = Cu, Co, Ni) composite yolk–shell nanospheres with enhanced catalytic properties for CO oxidation

“…The wide low-temperature band centered at 179 °C originates from the highly dispersed CuO x clusters, while the sharp high-temperature peak located at 200 °C is due to the strong interactions in the Cu–[O]–Ce structure [13]. In general, commercial Cu 2 O and pure CuO synthesized using a conventional precipitation method exhibit a H 2 consumption peak in the range of 240–300 °C, related to the reduction in the pure bulk CuO x phase [25,35]. For comparison, the binary Ce–Cu oxide shows relatively low reducibility compared to pure ceria and copper oxides due to the significant interaction between the two phases.…”

Recent Progress in Well‐Controlled Synthesis of Ceria‐Based Nanocatalysts towards Enhanced Catalytic Performance

“…[ 167,168 ] Till now, several heterogeneous nanocomposite catalysts based on interfacial oxidation-reduction reactions have been fabricated through coprecipitation method such as Pd@CeO 2 [ 31 ] and Cu 2 O@CeO 2 [ 167 ] core-shell structured nanospheres, pomegranate-like Ag@CeO 2 [ 169 ] and Pt@CeO 2 [ 170 ] multicore@ shell structured nanocomposites. With subsequent treatment, coprecipitation method is suffi cient for preparing metal oxide supported noble metal nanocomposites with uniform composition and narrow size distribution.…”

Ceria-Coated Gold Nanorods for Plasmon-Enhanced Near-Infrared Photocatalytic and Photoelectrochemical Performances

“…Here, the semiconductor shell material has been appointed as ceria, which has been widely used as ultraviolet (UV) absorber, and catalyst for carbon monoxide conversion. [30][31][32][33][34] The reversibility between Ce 3+ and Ce 4+ also endows it with an anti-oxidant ability to protect cell from radiation damage or inflammation. [35][36][37][38] Moreover, the Ce 4+ −Ce 3+ redox cycle is benefit for the Fenton-like reaction.…”