Controlled Synthesis of CeO₂/Graphene Nanocomposites with Highly Enhanced Optical and Catalytic Properties

Abstract

In this paper, CeO 2 nanocubes with the (200)terminated surface/graphene sheet composites have been prepared successfully by a simple hydrothermal method. It is found that the CeO 2 nanocubes with high crystallinity and specific exposed surface are well dispersed on well-exfoliated graphene surface. The (200)-terminated surface/graphene sheet composites modified electrode showed much higher sensitivity and excellent selectivity in its catalytic performance compared to a CeO 2 nanoparticle-modified electrode. The photoluminescence intensity of the CeO 2 anchored on graphene is about 30 times higher than that of pristine CeO 2 crystals in air. The higher oxygen vacancy concentration in CeO 2 is supposed to be an important cause for the higher photoluminescence and better electrochemical catalytic performance observed in the (200)-terminated surface/graphene sheet composites. Such ingenious design of supported well-dispersed catalysts in nanostructured ceria catalysts, synthesized in one step with an exposed high-activity surface, is important for technical applications and theoretical investigations.

Synthesis of 3D porous CeO2/reduced graphene oxide xerogel composite and low level detection of H2O2

“…From Raman spectra it is clearly evident that the D/G intensity ratio of CeO 2 /rGO xerogels (∼1.02) is slightly higher than that of graphene oxide (∼0.92) which is attributed to restoration of sp 2 domains due to reduction of graphene oxide [5]. The peak at ∼ 458 cm −1 can be attributed to the F 2g bands of CeO 2 consistent with the previous reports in the literature [5]. By comparing the Raman spectra of GO and CeO 2 /rGO xerogels there is a shift of raman peaks of CeO 2 /rGO xerogels.…”

“…The ultra-low density graphene xerogel having continuous porosities, high surface areas, and high electrical conductivity has recently attracted great attention due to its promising potential for the energy storage/conversion, catalysis, high performance nanocomposites and sensing device applications [1][2][3][4][5][6][7][8]. Inorganic nanomaterials having large surface to volume ratio and good catalysis have been largely stimulated for fabricating the nonenzymatic sensor for H 2 O 2 [9][10][11][12].…”

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

“…This indicated that the hybrid materials have rendered an enhanced electrical conductivity which eventually results in the enhanced electrochemical signals. It also implied that the hybrid materials introduced with the carbon paste electrodes eventually enhanced the electron transfer kinetics with an enhanced surface sensitivity [17,31]. Therefore, the CPE modified with hybrid materials showed an enhanced sensitivity of detection and could be useful materials in the development of electrochemical sensors [18].…”

Controllable Synthesis and Growth Mechanism of Ceria Nanocubes by Template‐Free Hydrothermal Method

“…[1] CeO 2 has excellent oxygen storage and release capability because of its valence change between possible oxidation states of Ce(III) and Ce(IV). It has been widely used in catalytic materials, [2][3][4][5][6][7][8] UV absorption, [9,10] oxygen sensing materials, [11] solid oxide fuel cells [12,13] due to its unique structure and properties.…”