Carbon Dioxide Adsorption on CeO<sub>2</sub>(110): An XPS and NEXAFS Study

Yang, Chengwu; Bebensee, Fabian; Yu, Xiaojuan; Nefedov, Alexei; Wöll, Christof

doi:10.1002/cphc.201700240

Cited by 40 publications

(27 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In regard to physisorbed CO 2 , typically a signal at higher binding energies (∼292−294 eV) is expected in the C 1s spectrum. 70,71 While there is no evidence for this feature in the C 1s spectrum shown in Figure 6bii, from the O 1s spectrum, this CO 2 O 1s signal only accounts for 1.75 atom % of the sample. Moreover, the sensitivity factor for O 1s was set to 2.881 times that of C 1s for this measurement, and with the relative abundance of other carbon species in the sample, it is expected for such trace amounts of CO 2 to be undetected through the C 1s spectrum.…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 93%

“…69 A closer inspection of the O 1s environment through the high resolution spectrum in Figure 6dii reveals at least two unique environments at 535.3 (1.75 atom %) and 532.8 eV (3.68 atom %), which could be assigned to physisorbed CO 2 and carbonate (C−O/CO) oxygen environments, respectively. 70 These oxygenated species are most likely related to the carbon feed within the sample and could also be from adventitious carbon contamination during the XPS measurement. In accordance with the O 1s data, O−CO, C O, and C−O environments are also observed in the C 1s spectrum at 289.0, 287.8, and 286.5 eV, respectively (Figure 6bii).…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

See 1 more Smart Citation

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Djuandhi

Gaikwad

Cowie

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Selectively resourcing electrode components can provide a significant advantage in the uptake of next generation battery systems especially considering the performance of currently incumbent lithium-ion battery technology. This work systematically explores the use of a waste stream to generate electrode components and the influence that treatment and preparation factors have on electrochemical performance. A series of carbonaceous materials derived from waste rubber tires are prepared, involving pyrolysis at 700 and 900 °C as well as physical activation using a feed of CO 2 gas. Results from Raman spectroscopy and X-ray powder diffraction (XRD) show an increase in graphitic character and larger particle size distribution of the carbon with increasing temperatures of pyrolyzation. They also reveal the impact of air and moisture on the evolution of crystalline impurities such as ZnS, CaCO 3 , and Ca(OH) 2 , and consequently their impact on the evolution of the carbon morphology. Galvanostatic cycling of Na-ion and Li−S cells involving the pyrolyzed rubber tires as an electrode component reveal different priorities as to which parameters to improve when designing materials for different cell systems. While higher specific capacities are achieved with more graphitic carbon morphologies in Na half-cells (300 mAh g −1 discharge capacity maintained after 20 cycles at 10 mA g −1 ), less graphitic morphologies were observed to reduce capacity fading experienced in Li−S cells (1003 mAh g −1 discharge capacity maintained after 18 cycles at 167.2 mA g −1 , ∼ 76% of initial value). Ex situ Raman, XRD, and X-ray absorption near-edge structure (XANES) spectroscopies were used to elucidate the mechanisms involved in post electrochemical treatment. This work highlights a pathway to use waste tires to generate valuable electrode components (active material in Na half-cells and S hosts in Li−S cells), and a similar methodology could be applied to other waste streams.

show abstract

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 93%

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Djuandhi

Gaikwad

Cowie

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…This is connected to the possibility of switching between Ce 4+ and Ce 3+ oxidation states and the corresponding ability to release and take up oxygen at the surface of the nanoparticles through the formation of oxygen vacancies. [3c,31a,81] Recently, the valence change from Ce 4+ and Ce 3+ has been observed by STEM in combination with spatially resolved EELS, and the extent of the reduced shells has been investigated as a function of particle size. [14a] It should be stressed that unambiguous conclusions could impossibly be drawn from 2D projection data only.…”

Section: D Electron Microscopymentioning

confidence: 99%

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Zhang

Bals

Tendeloo

2018

Part & Part Syst Charact

View full text Add to dashboard Cite

Engineering morphology and size of CeO2‐based nanostructures on a (sub)nanometer scale will greatly influence their performance; this is because of their high oxygen storage capacity and unique redox properties, which allow faster switching of the oxidation state between Ce4+ and Ce3+. Although tremendous research has been carried out on the shape‐controlled synthesis of CeO2, the characterization of these nanostructures at the atomic scale remains a major challenge and the origin of debate. The rapid developments of aberration‐corrected transmission electron microscopy (AC‐TEM) have pushed the resolution below 1 Å, both in TEM and in scanning transmission electron microscopy (STEM) mode. At present, not only morphology and structure, but also composition and electronic structure can be analyzed at an atomic scale, even in 3D. This review summarizes recent significant achievements using TEM/STEM and associated spectroscopic techniques to study CeO2‐based nanostructures and related catalytic phenomena. Recent results have shed light on the understanding of the different mechanisms. The potential and limitations, including future needs of various techniques, are discussed with recommendations to facilitate further developments of new and highly efficient CeO2‐based nanostructures.

show abstract

“…14 A study on a CeO x (111) film by Lykhach et al, however, revealed that neither the presence of a transition metal nor hydroxyl groups is required for the re-oxidation of ceria up to CeO 1.90 to take place, even at room temperature. 15 It has to be noted that, while the re-oxidation of the oxide has been observed in case of the (111) oriented surface, the (100) and (110) surfaces of CeO 2Àx have been shown to not be re-oxidized by adsorbed CO 2 , 16,17 though exhibiting a strong interaction with CO 2 at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal reduction of ceria nanostructures on rhodium(111) and re-oxidation by CO₂

Schaëfer

Hagman

Höcker

et al. 2018

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The thermal reduction of cerium oxide nanostructures deposited on a rhodium(111) single crystal surface and the re-oxidation of the structures by exposure to CO2 were investigated. Two samples are compared: a rhodium surface covered to ≈60% by one to two O-Ce-O trilayer high islands and a surface covered to ≈65% by islands of four O-Ce-O trilayer thickness. Two main results stand out: (1) the thin islands reduce at a lower temperature (870-890 K) and very close to Ce2O3, while the thicker islands need higher temperature for reduction and only reduce to about CeO1.63 at a maximum temperature of 920 K. (2) Ceria is re-oxidized by CO2. The rhodium surface promotes the re-oxidation by splitting the CO2 and thus providing atomic oxygen. The process shows a clear temperature dependence. The maximum oxidation state of the oxide reached by re-oxidation with CO2 differs for the two samples, showing that the thinner structures require a higher temperature for re-oxidation with CO2. Adsorbed carbon species, potentially blocking reactive sites, desorb from both samples at the same temperature and cannot be the sole origin for the observed differences. Instead, an intrinsic property of the differently sized CeOx islands must be at the origin of the observed temperature dependence of the re-oxidation by CO2.

show abstract

Carbon Dioxide Adsorption on CeO₂(110): An XPS and NEXAFS Study

Cited by 40 publications

References 48 publications

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Thermal reduction of ceria nanostructures on rhodium(111) and re-oxidation by CO₂

Contact Info

Product

Resources

About

Carbon Dioxide Adsorption on CeO2(110): An XPS and NEXAFS Study

Cited by 40 publications

References 48 publications

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Repurposing Waste Tires as Tunable Frameworks for Use in Sodium-Ion and Lithium–Sulfur Batteries

Understanding CeO2‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Thermal reduction of ceria nanostructures on rhodium(111) and re-oxidation by CO2

Contact Info

Product

Resources

About

Carbon Dioxide Adsorption on CeO₂(110): An XPS and NEXAFS Study

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Thermal reduction of ceria nanostructures on rhodium(111) and re-oxidation by CO₂