Modification of Ce valence states by Sm/Sr co-doping of CeO 2 nanoparticles for improved magneto-electrochemical properties

Swatsitang, Ekaphan; Phokha, Sumalin; Hunpratub, Sitchai; Maensiri, Santi

doi:10.1016/j.matdes.2016.06.092

Cited by 40 publications

(5 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The arguments that perturbations in fluoritestructure of CeO 2 are responsible for this effect are reinforced by the appearance of the weak bands (otherwise Raman inactive) corresponding to zone-center transverse doubly degenerated (IR active) and longitudinal optical modes [29,30]. The respective frequencies of 272 cm -1 and 595 cm -1 defined in optical reflectivity studies [29,31] of CeO 2 coincide well with the positions of the weak broad peaks observed in the Raman spectra of Pd/CeO 2 -rGO sample of this work, and in the Raman spectra of CeO 2 of earlier studies [24,26,28]. All these Raman features may reflect a breakage of a local symmetry of Ce-O vibration units, caused by a high concentration of oxygen vacancies, which in turn modifies the Raman and infrared selection rules for vibrational modes of stoichiometric fluorite-structure of CeO 2 .…”

Section: Resultssupporting

confidence: 80%

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Franchini

Llorca

Kuznetsov

et al. 2020

Diamond and Related Materials

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 80%

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Franchini

Llorca

Kuznetsov

et al. 2020

Diamond and Related Materials

View full text Add to dashboard Cite

“…While CeO 2 –rG1 bands are positioned at 259, 462, 596, 1089, 1334, and 1593 cm –1 , CeO 2 –rG2 bands are located at 254, 457, 594, 1084, 1329, and 1587 cm –1 . There is a slight rise in intensity of the F 2g band indicating CeO 2 –rG nanocomposites have increased surface oxygen vacancies because of creation of Ce 3+ ions . The Raman bands in nanocomposites show minor blue shifting compared to pure CeO 2 .…”

Section: Resultsmentioning

confidence: 97%

“…42,43 The peak detected at 934 cm −1 originates from the combination of A 1g , E g , and F 2g modes. 44 The band 1125 cm 48 The Raman bands in nanocomposites show minor blue shifting compared to pure CeO 2 . The primary reason for blue shift in the nanocomposites may be charge transfer between CeO 2 nanoparticles and the rGO sheets.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Hydroelectric Cell Based on a Cerium Oxide-Decorated Reduced Graphene Oxide (CeO₂–rG) Nanocomposite Generates Green Electricity by Room-Temperature Water Splitting

2020

View full text Add to dashboard Cite

Non-photocatalytic water splitting by oxygen-deficient, mesoporous metal oxide-engineering-based hydroelectric cell (HEC) as a path-breaking invention to generate electricity is a well-known phenomenon. To obtain more electricity from HEC, the metal oxide with higher oxygen deficiency is a better option; therefore, use of CeO 2 would be a better choice in the present work. Oxygen-deficient mesoporous CeO 2 , CeO 2 −rG1, and CeO 2 −rG2 nanocomposites have been synthesized by the one-step wet precipitation method. Increase in oxygen vacancies in the presence of Ce 3+ concentration by the intense F 2g peak in Raman spectra of CeO 2 −rGO nanocomposite is compared to CeO 2 . The strain developed in the CeO 2 lattice because of defect creation has been verified by high-resolution transmission electron microscopy images and X-ray diffraction. Defect pair formation in nanocomposite emits visible emission were taken by photoluminescence spectroscopy. Addition of rGO in CeO 2 improved the surface area from 60.57 to 74.49 m 2 /g, which is confirmed by Brunauer−Emmett−Teller measurements. In HEC, water molecules are chemidissociated on the oxygen-deficient mesoporous surface of the pellet followed by physidissociation of water molecules at mesopores. Current is produced by redox reaction of dissociated ions at the Zn anode and Ag cathode attached to the nanocomposite pellet. Nanocomposite CeO 2 −rG2-based HEC delivers a short circuit current of 21.3 mA and an open-cell voltage of 0.84 V by adding few drops of water. CeO 2 −rG2-based HEC of an area of 4.8 cm 2 delivers a maximum power of 17.66 mW which is 2.25 times higher than the reported power of 7.84 mW for Li−magnesium ferrite-based HEC. Addition of rGO in highly resistive CeO 2 significantly enhanced oxygen vacancies and mesoporosity, which improved the output power of HEC.

show abstract

“…Some research has indicated that alkaline earth metals (Ca and Sr etc.) (Fernández-García et al, 2002;Swatsitang et al, 2016), rare earth metals (Y, La, Pr, Nd, and Sm etc.) (Tan et al, 2015;Tan et al, 2016) and transition earth metals (Cr, Mn, Fe, Co, Ni, and Cu etc.)…”

Section: Catalyst Characteristicsmentioning

confidence: 99%

Effects of Blending Ethanol with Gasoline on the Performance of Motorcycle Catalysts and Airborne Pollutant Emissions

Tsai

Huang

et al. 2019

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

This study investigated the effects of blending ethanol with gasoline on the exhaust emissions of fuel-injected motorcycles. Regulated gasoline (RF), and 15 (E15) and 30 (E30) vol% ethanol fuel were used as test fuels. Measurements of several air pollutants (CO, HC, and NO x ) and organic air pollutant groups were conducted for two new fuel-injected four-stroke motorcycles. In addition, various catalysts were inserted into the motorcycles' tailpipes to determine the characteristics and performance of the catalysts in treating the exhaust.Compared to using RF, we found that using blended fuel potentially reduced the CO and HC emissions by 30-37% and 19-28%, respectively. New catalytic systems, in conjunction with using different fuels, reduced CO, HC, and NO x emissions in the tailpipe exhaust by 12-61%, 32-39%, and 81-85%, respectively. The CO and HC emissions were directly proportional in quantity to the running mileage of the catalyst, but the NO x emissions were unaffected by this mileage, although they increased as the catalyst aged.We also discovered that at identical running mileages for a catalyst, the fuel consumption increased by -1.7-6.5% and 4.1-15% when using E15 and E30 fuel instead of RF. Furthermore, the specific surface area and pore volume of the catalyst decreased with the aged catalyst the phosphorus and sulfur content in the catalyst increased with the catalyst's running mileage; adding ethanol to the fuel decreased emissions of paraffins, olefins, and aromatics but increased those of carbonyls; and the ozone formation potential of volatile organic compounds (VOCs) in the tailpipe exhaust was 16.7-17.2% for paraffins, 22-33% for olefins, 26-45% for aromatics, and 4.9-25% for carbonyls.

show abstract

Modification of Ce valence states by Sm/Sr co-doping of CeO 2 nanoparticles for improved magneto-electrochemical properties

Cited by 40 publications

References 55 publications

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Hydroelectric Cell Based on a Cerium Oxide-Decorated Reduced Graphene Oxide (CeO₂–rG) Nanocomposite Generates Green Electricity by Room-Temperature Water Splitting

Effects of Blending Ethanol with Gasoline on the Performance of Motorcycle Catalysts and Airborne Pollutant Emissions

Contact Info

Product

Resources

About

Modification of Ce valence states by Sm/Sr co-doping of CeO 2 nanoparticles for improved magneto-electrochemical properties

Cited by 40 publications

References 55 publications

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Outstanding dispersion of CeO2 on reduced graphene oxide. Implications for highly dispersed Pd catalysts

Hydroelectric Cell Based on a Cerium Oxide-Decorated Reduced Graphene Oxide (CeO2–rG) Nanocomposite Generates Green Electricity by Room-Temperature Water Splitting

Effects of Blending Ethanol with Gasoline on the Performance of Motorcycle Catalysts and Airborne Pollutant Emissions

Contact Info

Product

Resources

About

Hydroelectric Cell Based on a Cerium Oxide-Decorated Reduced Graphene Oxide (CeO₂–rG) Nanocomposite Generates Green Electricity by Room-Temperature Water Splitting