Effects of CeO2 nanoparticles on electrochemical properties of carbon/CeO2 composites

Phokha, Sumalin; Hunpratub, Sitchai; Usher, B. F.; Pimsawat, Adulphan; Chanlek, Narong; Maensiri, Santi

doi:10.1016/j.apsusc.2018.02.209

Cited by 38 publications

(14 citation statements)

References 41 publications

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“…The high-resolution XPS spectrum of 3D Ce is shown in Figure 6 a, and demonstrates the presence of a mixed valence state. The O 1s XPS peak at 530.8 eV corresponds to the oxygen in CeO 2 , and further confirms the presence of CeO 2 ( Figure 6 b) [ 24 ]. The O 1s peak at 528.6 eV indicates that there are residual oxygen groups associated with the C atoms in 3D RGO.…”

Section: Resultsmentioning

confidence: 55%

“…XRD peaks were recorded at 2 θ = 28.5°, 33.1°, 47.4°, 56.3°, 69.4°, 76.6° and 79.0°, and could be well allocated to the (111), (200), (220), (311), (400), (331) and (420) planes, respectively, of CeO 2 (JCPDS No. 34-0394) [ 24 ]. Two feeble peaks of 3D RGO are observed at 26.2° and 43.7° because of a fairly low diffraction intensity of 3D RGO [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

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Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

et al. 2018

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In this paper, the synthesis of the three-dimensional (3D) composite of spherical reduced graphene oxide (RGO) with uniformly distributed CeO2 particles is reported. This synthesis is done via a facile and large-scalable spray-drying process, and the CeO2/RGO materials are hydrothermally compounded with sulfur. The morphology, composition, structure, and electrochemical properties of the 3D S/CeO2/RGO composite are studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Raman spectra and X-ray photoelectron spectroscopy (XPS), etc. The electrochemical performance of the composites as electrodes for lithium–sulfur batteries is evaluated. The S/CeO2/RGO composites deliver a high initial capacity of 1054 mAh g−1, and retain a reversible capacity of 792 mAh g−1 after 200 cycles at 0.1 C. Profiting from the combined effect of CeO2 and RGO, the CeO2/RGO materials effectively inhibit the dissolution of polysulfides, and the coating of spherical RGO improves the structural stability as well as conductivity.

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Section: Resultsmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

et al. 2018

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“…[40,44] The Ce 3d 5/2 (v,v '',a nd v''')p eaks located at 882.1, 888.9, and 898.1 eV,a nd Ce 3d 3/2 (u, u'',a nd u''')p eaks located at 900.2, 907.0, and 916.2 eV,c orresponded to Ce 4 + ions, whichcan be clearly observed in all the modified samples except post-Ce-400 as shown in Figure 5a. [40,44] The Ce 3d 5/2 (v,v '',a nd v''')p eaks located at 882.1, 888.9, and 898.1 eV,a nd Ce 3d 3/2 (u, u'',a nd u''')p eaks located at 900.2, 907.0, and 916.2 eV,c orresponded to Ce 4 + ions, whichcan be clearly observed in all the modified samples except post-Ce-400 as shown in Figure 5a.…”

Section: Resultsmentioning

confidence: 99%

“…As shown, all diffraction peaks of each sample can be indexed to the hexagonal LiNiO 2 (PDF#09-0063), with a R3 m space group. [39] The impure peaks marked by the stars, corresponding to the cubic crystal CeO 2 with a Fm3 m space group (PDF#43-1002), [40] can only be found in samples synthesized at above 500 8C. The clear splittings of (0 06)/(0 12)a nd (0 18)/ (110)p eaks indicate aw ell-developed layered structure.…”

Section: Resultsmentioning

confidence: 99%

“…To furtheri dentify the surface chemistry of NCM andm odified samples, X-ray photoelectron spectroscopy (XPS) tests were applied. [40,44] The Ce 3d 5/2 (v,v '',a nd v''')p eaks located at 882.1, 888.9, and 898.1 eV,a nd Ce 3d 3/2 (u, u'',a nd u''')p eaks located at 900.2, 907.0, and 916.2 eV,c orresponded to Ce 4 + ions, whichcan be clearly observed in all the modified samples except post-Ce-400 as shown in Figure 5a. [45] These results, combined with those of the XRD and SEM tests, imply that the Ce 4 + ions correspond to the CeO 2 protection layer when the calcination temperature is above 500 8C.…”

Section: Resultsmentioning

confidence: 99%

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Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Lai

et al. 2019

ChemSusChem

117

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Nickel‐rich cathode materials are among the most promising cathode materials for high‐energy lithium‐ion batteries. However, their structural and thermodynamic stability, cycle and rate performances still need to be further improved. In this study, the rare earth element Ce is employed to reinforce the interface of Ni‐rich cathode materials both internally and externally. High‐valence Ce4+ can easily cause the oxidization of Ni2+ to Ni3+ when doped into the material owing to its strong oxidation performance, thus reducing Li+/Ni2+ mixing. In addition, the inert Ce3+ ions in transition metal slabs with strong Ce−O bonds can maintain the layered structure at high delithiation state. Furthermore, when the calcination temperature during synthesis is above 500 °C, a CeO2 coating layer will form, which can protect the electrode from erosion by the electrolyte and alleviate the increasing resistance during cycling. The modified Ni‐rich materials fabricated with an erosion‐resistant CeO2 layer outside and stronger Ce−O bonds inside with reduced Li+/Ni2+ mixing exhibit excellent electrochemical properties, especially at high operating voltages, for example, the 50th capacity retention at 0.2 C within 2.75–4.5 V is improved from 89.8 % to 99.2 % after the modification.

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Anchoring 0D CeO₂ Nanoparticles on 2D LaTiO₂N Nanosheets for Efficient Visible‐Light‐Driven Photocatalytic CO₂ Reduction

et al. 2022

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The efficiency of photocatalytic reduction of CO 2 with water to hydrocarbons is largely limited by high recombination rate of photogenerated electrons and holes in the photocatalysts. Herein, 0D/2D CeO 2 /LaTiO 2 N S-scheme heterojunction photocatalyst prepared by simple in-situ hydrothermal approach realizes the overall conversion of gaseous CO 2 and H 2 O without any sacrificial reagent and cocatalyst. The yields of CH 4 and CO over CeO 2 /LaTiO 2 N sample under visible light for 3 h are 1.5 and 7.2 μmol g À 1 , and the corresponding utilized photoelectron number (UPN) is 26.4 μmol g À 1 , about 7.3 and 7.8 times that of individual LaTiO 2 N and CeO 2 , respectively. The enhanced photocatalytic activity of 0D/2D CeO 2 /LaTiO 2 N is attributed to the constitution of the S-scheme heterojunction, which effectively inhibits the recombination of photogenerated carriers. This study is expected to provide a new insight into the construction of efficient 0D/2D photocatalysts for visible-light-driven photocatalytic CO 2 reduction.

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Effects of CeO2 nanoparticles on electrochemical properties of carbon/CeO2 composites

Cited by 38 publications

References 41 publications

Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Anchoring 0D CeO₂ Nanoparticles on 2D LaTiO₂N Nanosheets for Efficient Visible‐Light‐Driven Photocatalytic CO₂ Reduction

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Effects of CeO2 nanoparticles on electrochemical properties of carbon/CeO2 composites

Cited by 38 publications

References 41 publications

Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

Three-Dimensional S/CeO2/RGO Composites as Cathode Materials for Lithium–Sulfur Batteries

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Anchoring 0D CeO2 Nanoparticles on 2D LaTiO2N Nanosheets for Efficient Visible‐Light‐Driven Photocatalytic CO2 Reduction

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Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Anchoring 0D CeO₂ Nanoparticles on 2D LaTiO₂N Nanosheets for Efficient Visible‐Light‐Driven Photocatalytic CO₂ Reduction