Solubility product difference-guided synthesis of Co3O4–CeO2 core–shell catalysts for CO oxidation

Chen, Guozhu; Xu, Quan; Wang, Yong; Song, Guolong; Li, Cuncheng; Zhao, Wei; Fan, Weiliu

doi:10.1039/c6cy01378c

Cited by 36 publications

(13 citation statements)

References 38 publications

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“…In recent years, transition-metal oxides have become popular as non-noble metal catalysts [20][21][22][23][24][25][26], and their CO oxidation performance has been reported to be strongly influenced by the catalysts' structure, size, and morphology [27]. Chen et al [28] synthesized Co 3 O 4 -CeO 2 core-shell catalysts and proved that the synergistic effect between Co 3 O 4 and CeO 2 is responsible for their enhanced catalytic activity compared with that of regular catalysts. Narayana et al [29] prepared spherical CeO 2 nanoparticles with Mn-ion substitution and observed the highest CO oxidation rate for the structure with the highest amounts of Mn 2+ as well as oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

et al. 2020

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Hydrothermal and co-precipitation methods were studied as two different methods for the synthesis of CeO 2 nanocatalysts. Co/CeO 2 catalysts supported by 2, 4, 6, or 8wt% Co were further synthesized through impregnation and the performance of the catalytic oxidation of CO has been investigated. The highest specific surface area and the best catalytic performance was obtained by the catalyst 4wt% Co/CeO 2 with the CeO 2 support synthesized by the hydrothermal method (4% Co/CeO 2 -h), which yielded 100% CO conversion at 130 • C. The formation of CeO 2 nanoparticles was confirmed by TEM analysis. XRD and SEM-EDX mapping analyses indicated that CoO x is highly dispersed on the 4% Co/CeO 2 -h catalyst surface. H 2 -TPR and O 2 -TPD results showed that 4% Co/CeO 2 -h possesses the best redox properties and the highest amount of chemically adsorbed oxygen on its surface among all tested catalysts. Raman and XPS spectra showed strong interactions between highly dispersed Co 2+ active sites and exposed Ce 3+ on the surface of the CeO 2 support, resulting in the formation of the strong redox cycle Ce 4+ + Co 2+ ↔ Ce 3+ + Co 3+ .This may explain that 4% Co/CeO 2 -h exhibited the best catalytic activity among all tested catalysts.

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Section: Introductionmentioning

confidence: 99%

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

et al. 2020

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“…In the fitted spectrum of Co, peaks from Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 were also observed which could be because of growth on the surface. Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 is widely used as a precursor for the growth of Co 3 O 4 nanowires. , Further, no traces of this impurity phase was observed in XRD, confirming the growth of CoMoO 4 as a major crystalline phase. The binding energy at 529.79 eV corresponds to O 1s of CoMoO 4 as shown in Figure c and the satellite peak at 531.70 eV is attributed to the surface impurity as observed in the Co 2p edge.…”

Section: Resultsmentioning

confidence: 89%

Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO₄ Anode Material for Sodium-Ion Batteries

Ali¹,

Islam

Kim³

et al. 2018

ACS Appl. Mater. Interfaces

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Sodium-ion batteries are considered the most promising power source for electrical energy storage systems because of the abundance of sodium and their significant cost advantages. However, high-performance electrode materials are required for their successful application. Herein, we report a monoclinic-type CoMoO 4 material which is synthesized by a simple solution method. An optimized calcination temperature with a high crystallinity and a rodlike morphology of the material are selected after analyzing the as-synthesized powder by temperature-dependent time-resolved X-ray diffraction. The CoMoO 4 rods exhibit initial discharge and charge capacities of 537 and 410 mA h g −1 , respectively, when used as an anode for sodium-ion batteries. The sodium diffusion coefficient in the bimetallic CoMoO 4 anode is measured using the galvanostatic intermittent titration technique and calculated in the range of 1.565 × 10 −15 to 4.447 × 10 −18 cm 2 s −1 during the initial cycle. Further, the reaction mechanism is investigated using ex situ X-ray diffraction and X-ray absorption spectroscopy, and the obtained results suggest an amorphouslike structure and reduction/oxidation of Co and Mo during the sodium insertion/extraction process. Ex situ transmission electron microscopy and energy-dispersive spectroscopy images of the CoMoO 4 anode in fully discharged and recharged state reveal the rodlike morphology with homogenous element distribution.

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“…The peak at a higher binding energy (Oα: 531.5 eV) was derived from the adsorptive oxygen species. Apart from the insignificant influence from the surrounding atmosphere, the XPS data was complementary to other techniques insofar as showing the successful synthesis of the Co 3 O 4 –CeO 2 hierarchical nanotubes.…”

Section: Resultsmentioning

confidence: 99%

“…Synergistic effects have also been observed if CeO 2 coexists with other transition‐metal‐based catalysts such as CeO 2 –Fe 2 O 3 , CeO 2 –CuO and CeO 2 –MnO 2 . Therefore, there is reason to believe that the hierarchical structure of a Co 3 O 4 –CeO 2 composite material would exhibit good performance toward CO oxidation . Additionally, CO oxidation can be significantly influenced by the morphology of the material.…”

Section: Introductionmentioning

confidence: 99%

Hollow Mesoporous Co₃O₄–CeO₂ Composite Nanotubes with Open Ends for Efficient Catalytic CO Oxidation

Chen

et al. 2019

ChemSusChem

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Catalytic performance is heavily dependent on how the structures of nanomaterials are designed. Co3O4–CeO2 composite nanotubes with open ends and mesoporous structures were fabricated through a facile and environmentally friendly reaction. The mesoporous Co3O4 nanotubes were synthesized by the calcination of cobalt–aspartic acid (Co–Asp) nanowires and coated with a CeO2 shell. The composite nanotubes were characterized by SEM, TEM, XRD, and X‐ray photoelectron spectroscopy. The composite materials comprise a combination of Co3O4 nanotubes and CeO2 nanoparticles with a hollow and mesoporous bimetallic oxide structure. The large BET surface area led to a higher degree of accessible active sites compared with other Co3O4–CeO2 composite nanomaterials with other structures. The resulting Co3O4–CeO2‐26.3 wt % composite nanotubes, with a CeO2 content of approximately 26.3 wt %, achieved 100 % CO conversion at 145 °C. Additionally, the synergistic effect between the two metal oxides comprising the Co3O4–CeO2 composite nanotubes was demonstrated by the enhanced catalytic activity compared with pure Co3O4 nanotubes and CeO2 nanoparticles.

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Solubility product difference-guided synthesis of Co₃O₄–CeO₂ core–shell catalysts for CO oxidation

Abstract: Co3O4–CeO2 core–shell catalysts are successfully fabricated by an ion exchange procedure between Co(CO3)0.35Cl0.2(OH)1.1 nanorods and Ce3+ aqueous solution, followed by a calcination step.

Cited by 36 publications

References 38 publications

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO₄ Anode Material for Sodium-Ion Batteries

Hollow Mesoporous Co₃O₄–CeO₂ Composite Nanotubes with Open Ends for Efficient Catalytic CO Oxidation

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Solubility product difference-guided synthesis of Co3O4–CeO2 core–shell catalysts for CO oxidation

Abstract: Co3O4–CeO2 core–shell catalysts are successfully fabricated by an ion exchange procedure between Co(CO3)0.35Cl0.2(OH)1.1 nanorods and Ce3+ aqueous solution, followed by a calcination step.

Cited by 36 publications

References 38 publications

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO4 Anode Material for Sodium-Ion Batteries

Hollow Mesoporous Co3O4–CeO2 Composite Nanotubes with Open Ends for Efficient Catalytic CO Oxidation

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Resources

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Solubility product difference-guided synthesis of Co₃O₄–CeO₂ core–shell catalysts for CO oxidation

Kinetic and Electrochemical Reaction Mechanism Investigations of Rodlike CoMoO₄ Anode Material for Sodium-Ion Batteries

Hollow Mesoporous Co₃O₄–CeO₂ Composite Nanotubes with Open Ends for Efficient Catalytic CO Oxidation