Microdomain sulfur-impregnated CeO2-coated CNT particles for high-performance Li-S batteries

Gueon, Donghee; Yoon, Jisu; Hwang, Jeong Tae; Moon, Jun Hyuk

doi:10.1016/j.cej.2020.124548

Cited by 27 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The specific surface area and pore structure of CNF (Figure S6 , Supporting Information), CeO 2 ‐CNF (Figure S6 , Supporting Information) and Ni‐CeO 2 ‐CNF ( Figure 3 a ) were characterized using nitrogen adsorption‐desorption isotherms. [ 26 , 37 ] The specific surface areas of CNF, CeO 2 ‐CNF, and Ni‐CeO 2 ‐CNF are 66.7, 232.4, and 159.0 m 2 g −1 , respectively. The pore volumes of CNF, CeO 2 ‐CNF, and Ni‐CeO 2 ‐CNF are 0.05, 0.14, and 0.13 cm 3 g −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Kong

Huang

et al. 2022

Advanced Science

View full text Add to dashboard Cite

Lithium–sulfur (Li–S) batteries have attracted considerable attention over the last two decades because of a high energy density and low cost. However, the wide application of Li–S batteries has been severely impeded due to the poor electrical conductivity of S, shuttling effect of soluble lithium polysulfides (LiPSs), and sluggish redox kinetics of S species, especially under high S loading. To address all these issues, a Ni–CeO2 heterostructure‐doped carbon nanofiber (Ni‐CeO2‐CNF) is developed as an S host that combines the strong adsorption with the high catalytic activity and the good electrical conductivity, where the LiPSs anchored on the heterostructure surface can directly gain electrons from the current collector and realize a fast conversion between S8 and Li2S. Therefore, Li–S batteries with S@Ni‐CeO2‐CNF cathodes exhibit superior long‐term cycling stability, with a capacity decay of 0.046% per cycle over 1000 cycles, even at 2 C. Noteworthy, under a sulfur loading up to 6 mg cm−2, a high reversible areal capacity of 5.3 mAh cm−2 can be achieved after 50 cycles at 0.1 C. The heterostructure‐modified S cathode effectively reconciles the thermodynamic and kinetic characteristics of LiPSs for adsorption and conversion, furthering the development of high‐performance Li–S batteries.

show abstract

Section: Resultsmentioning

confidence: 99%

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Kong

Huang

et al. 2022

Advanced Science

View full text Add to dashboard Cite

show abstract

“…The proportion of Ce 3+ can be estimated to be ∼19.0% by the ratio of Ce 3+ peak area to both Ce 3+ and Ce 4+ peak area . In the O 1s spectrum (Figure S4c), four peaks at 529.8, 531.3, 533.8, and 535.3 eV, respectively, correspond to lattice oxygen (Ce–O), adsorbed oxygen (O ads ), hydroxyl group (OH – ), and C–O. − In the C 1s spectrum (Figure S4d), two peaks at 284.7 and 286.1 eV are attributed to C–C and C–O, respectively. XPS analysis of CeO 2– x @C (Figure S5) also shows that it includes Ce, O, and C elements, and the Ce 3d spectrum is roughly the same as that of CeO 2– x @C-rGO.…”

Section: Resultsmentioning

confidence: 99%

“…After interaction with Li 2 S 6 , the Ce 3d band (Figure b) slightly shifts toward a lower binding energy of 0.3 eV attributed to the electron transfer between the Li 2 S 6 molecules and Ce atoms, indicating a strong chemical interaction between CeO 2– x and LiPS. Additionally, after Li 2 S 6 adsorption, the S 2p band appears in the survey spectrum of CeO 2– x @C-rGO, which can be fitted to four pairs of doublets (Figures S6 and c): two pairs assigned to the terminal sulfur (S T –1 ) and bridging sulfur (S B 0 ) of the adsorbed Li 2 S 6 molecule and the other two pairs ascribed to the thiosulfate and polythionate created by the surface redox of LiPS with CeO 2– x and further reaction of thiosulfate with LiPS. , It is reported that the thiosulfate and polythionate species may serve as a mediator for LiPS anchoring and transferring, , thus suppressing the LiPS dissolution and migration.…”

Section: Resultsmentioning

confidence: 99%

Layer-by-Layer Assembly of CeO_2–x@C-rGO Nanocomposites and CNTs as a Multifunctional Separator Coating for Highly Stable Lithium–Sulfur Batteries

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Commercialization of high-energy Li–S batteries is greatly restricted by their unsatisfactory cycle retention and poor cycling life originated from the notorious “shuttling effect” of lithium polysulfides. Modification of a commercial separator with a functional coating layer is a facile and efficient strategy beyond nanostructured composite cathodes for suppressing polysulfide shuttling. Herein, a multilayered functional CeO2–x @C-rGO/CNT separator was successfully achieved by alternately depositing conductive carbon nanotubes (CNTs) and synthetic CeO2–x @C-rGO onto the surface of the commercial separator. The cooperation of multiple components including Ce-MOF-derived CeO2–x @C, rGO, and CNTs enables the as-built CeO2–x @C-rGO/CNT separator to perform multifunctions from the separator surface: (i) to hinder the diffusion of polysulfide species through physical blocking or chemical adsorption, (ii) to accelerate the sluggish redox reactions of sulfur species, and (iii) to enhance the conductivity for sulfur re-activation and efficient utilization. Serving as a multilayer and powerful barrier, the CeO2–x @C-rGO/CNT separator greatly constrains and reutilizes the polysulfide species. Thus, the Li–S battery assembled with the CeO2–x @C-rGO/CNT separator demonstrates an excellent combination of capacity, rate capability, and cycling performances (an initial capacity of 1107 mA h g–1 with a low decay rate of 0.060% per cycle over 500 cycles at 1 C, 651 mA h g–1 at 5 C) together with remarkably mitigated self-discharge and anode corrosion. This work provides guidelines for functional separator design as well as rare-earth material applications for Li–S batteries and other energy storage systems.

show abstract

“…Therefore, obtaining an ideal heterojunction interface becomes the key to further improve the photocatalytic efficiency. 24 CeO 2 has been widely used in air pollution control, 26,27 solid fuel cells, 28,29 organic synthesis, 30,31 and other fields due to its characteristic of gaining and losing oxygen. CeO 2 also has a narrow bandgap of about 2.8 eV, making it also has good photocatalytic performance.…”

Section: ■ Introductionmentioning

confidence: 99%

“…CeO 2 has been widely used in air pollution control, , solid fuel cells, , organic synthesis, , and other fields due to its characteristic of gaining and losing oxygen. CeO 2 also has a narrow bandgap of about 2.8 eV, making it also has good photocatalytic performance .…”

Section: Introductionmentioning

confidence: 99%

An Interface Optimization Strategy for g-C₃N₄-Based S-Scheme Heterojunction Photocatalysts

Wang

Shen

2021

Langmuir

View full text Add to dashboard Cite

Graphitic carbon nitride (CN) has attracted much attention in photocatalytic fields due to its unique electronic band structure. However, the rapid recombination of photogenerated carriers severely inhibits its catalytic activity. The heterojunction structure has been widely confirmed to significantly improve the photocatalytic activity of CN through the formed interface structure. However, researchers often give attention to the band matching and conductivity of the cocatalyst, while the importance of the interface as a migration channel for photogenerated carriers is often overlooked. In this work, we adopt the strategy of morphology engineering to regulate the morphology of the CN photoactive component so as to achieve the interface optimization of the traditional heterojunction structure. The photocatalytic degradation experiment of rhodamine B shows that compared with the traditional CeO2@CN heterojunction structure, the photocatalytic activity of the interface-optimized CeO2/CN is increased by more than 20%. The following points could be used to explain the improvement of photocatalytic activity: (I) the formed S-scheme heterojunction structure, which inhibits the recombination of useful electrons and holes but expedites the recombination of relatively useless electrons and holes, (II) the increased interface area, which provides more carrier migration channels, and (III) the reduced interface contact resistance, which facilitates the separation and migration of photogenerated carriers. Furthermore, the interface optimization of the traditional Al2O3@CN and Fe2O3@CN heterojunction structures also achieved consistent results. This shows that the strategy in this work is a universal method for interface optimization, which provides potential alternative for further improving the catalytic activity of other heterojunction composites.

show abstract

Microdomain sulfur-impregnated CeO2-coated CNT particles for high-performance Li-S batteries

Cited by 27 publications

References 41 publications

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Layer-by-Layer Assembly of CeO_2–x@C-rGO Nanocomposites and CNTs as a Multifunctional Separator Coating for Highly Stable Lithium–Sulfur Batteries

An Interface Optimization Strategy for g-C₃N₄-Based S-Scheme Heterojunction Photocatalysts

Contact Info

Product

Resources

About

Microdomain sulfur-impregnated CeO2-coated CNT particles for high-performance Li-S batteries

Cited by 27 publications

References 41 publications

Ni‐CeO2 Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Ni‐CeO2 Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Layer-by-Layer Assembly of CeO2–x@C-rGO Nanocomposites and CNTs as a Multifunctional Separator Coating for Highly Stable Lithium–Sulfur Batteries

An Interface Optimization Strategy for g-C3N4-Based S-Scheme Heterojunction Photocatalysts

Contact Info

Product

Resources

About

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Ni‐CeO₂ Heterostructures in Li‐S Batteries: A Balancing Act between Adsorption and Catalytic Conversion of Polysulfide

Layer-by-Layer Assembly of CeO_2–x@C-rGO Nanocomposites and CNTs as a Multifunctional Separator Coating for Highly Stable Lithium–Sulfur Batteries

An Interface Optimization Strategy for g-C₃N₄-Based S-Scheme Heterojunction Photocatalysts