Seeding Co Atoms on Size Effect‐Enabled V₂C MXene for Kinetically Boosted Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Lithium‐sulfur (Li–S) batteries are facing a multitude of challenges, mainly pertaining to the sluggish sulfur redox kinetics and rampant lithium dendrite growth on cathode anode side, respectively. In this sense, MXene has shown conspicuous advantages in serving as dual‐functional promotor for Li–S throughout morphologic engineering, but still suffers from poor electrocatalytic activity insufficient lithophilic sites. Herein, atomically dispersed Co sites seeded onto size effect‐enabled V 2 C spheres (Co‐VC), leading generation unique coordination configurations rich active Electrochemical tests combined with synchrotron radiation X‐ray 3D nano‐computed tomography theoretical calculations unravel that Co‐VC optimal environments simultaneously boost reaction nucleation. As consequence, modified separator can sustain stable operation over 700 cycles negligible capacity decay at 1.0 C, delivers an areal 9.0 mAh cm −2 desired cyclic performance high loading 7.6 mg lean electrolyte dosage 4.0 µL S −1 0.1 C. The work opens new avenue boosting atomic‐scale site design aid 2D substrates toward pragmatic batteries.

Language: Английский

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New flexible separators for modification of high-performance lithium–sulfur batteries

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1005, P. 176146 - 176146

Published: Aug. 24, 2024

Language: Английский

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Bifunctional NiCoP nanofiber arrayed on carbon cloth for fast polysulfide conversion and uniform lithium deposition in lithium sulfur batteries

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 685, P. 235 - 243

Published: Jan. 15, 2025

Language: Английский

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Manipulating Energy Band Alignment and Oxygen Vacancies Engineering of Zro2 by Magnesium Ion Doping Strategy for Kinetics Enhanced Li-S Batteries

Published: Jan. 1, 2025

Language: Английский

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Manipulating energy band alignment and oxygen vacancies engineering of ZrO2 by magnesium ion doping strategy for kinetics enhanced Li-S batteries

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 179688 - 179688

Published: March 1, 2025

Language: Английский

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Engineering Triple‐Nanolayer VN/C@TCF Cathode with Synergistic Polysulfide Regulation for High‐Performance Li‐S Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 9, 2025

Abstract Lithium‐sulfur batteries face three fundamental challenges: uncontrolled polysulfide shuttling, substantial volumetric fluctuations during cycling, and the inherent electrical insulation of sulfur. To address these limitations, an asymmetric self‐supporting cathode is developed, featuring TiO₂‐decorated carbon nanofibers synergistically integrated with hollow shells encapsulating vanadium nitride catalysts (VN/C@TCF). Distinct from conventional configurations, this hierarchically structured “triple‐nanolayer” system establishes sequential mitigation mechanisms: (I) TiO 2 nanoparticles in inner layer provide chemical immobilization polysulfides; (II) intermediate shell enables physical confinement; (III) outer VN nanosheets offer anchoring capacity. Combined density functional theory calculations experimental analyses reveal that VN/C@TCF architecture simultaneously enhances conductivity, demonstrates superior catalytic activity, accommodates volume variations electrochemical cycling. The optimized delivers exceptional performance metrics, including a high initial discharge capacity 1417.9 mAh g⁻¹ at 0.1 C remarkable rate capability (803.2 5 C). Notably, electrode can maintain impressive areal 6.30 cm⁻ after 80 cycles under stringent operational conditions sulfur loading (8.1 mg ) lean electrolyte (E/S ratio = 4.8 µL mg⁻¹). This strategic design paradigm provides new insights for developing electrocatalytic systems advanced lithium‐sulfur batteries.

Language: Английский

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Engineering Bi/V/Mo‐Based Multicomponent Heterostructure Electrocatalyst Toward Robust Lithium–Sulfur Batteries and Mechanistic Insights into the Self‐Reconstruction

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 13, 2025

Abstract The sluggish reaction kinetics and formidable shuttle effect of soluble lithium polysulfides (LiPSs) are thorny problems for the future industrialization lithium–sulfur (Li–S) batteries. Therefore, exploring efficient electrocatalysts to capture LiPSs accelerate their conversion is highly desirable yet tremendously challenging. Herein, a high‐efficiency Bi/Bi 2 O 3 /VMoN@rGO electrocatalyst with multifunctional active sites multilevel heterointerfaces elaborately designed Li–S Noteworthy, can greatly modulate electron distribution, facilitate charge transfer, optimize chemical absorption, enhance intrinsic activity, while rGO contributes high electrical conductivity, sufficient sites, robust structural stability. Thanks synergy different components, batteries employing functional separators exhibit impressive electrochemical performance sulfur utilization even under loading. More importantly, it discovered that Bi experience an phase evolution generate S amorphous crystalline phases, thereby bringing in unexpected enhancement. Furthermore, experimental results theoretical calculations authenticate reduced Li decomposition energy barrier achieved after situ reconstruction. This work not only provides new mechanistic insights into developing but also sheds light on regulating catalytic activity via self‐reconstruction.

Language: Английский

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Se-doped MoC/NC nanorods modified separator for synergistically accelerating trap and conversion of polysulfides toward advanced Li-S battery

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 514, P. 163225 - 163225

Published: April 29, 2025

Language: Английский

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The progress of research on vacancies in HMF electrooxidation

Frontiers in Chemistry, Journal Year: 2024, Volume and Issue: 12

Published: June 14, 2024

5-Hydroxymethylfurfural (HMF), serving as a versatile platform compound bridging biomass resource and the fine chemicals industry, holds significant importance in conversion processes. The electrooxidation of HMF plays crucial role yielding valuable product (2,5-furandicarboxylic acid), which finds important applications antimicrobial agents, pharmaceutical intermediates, polyester synthesis, so on. Defect engineering stands one most effective strategies for precisely synthesizing electrocatalytic materials, could tune electronic structure coordination environment, further altering adsorption energy intermediate species, consequently increasing kinetics electrooxidation. Thereinto, routine defect are anionic vacancies cationic vacancies. In this concise review, catalytic reaction mechanism selective oxidation is first elucidated, with focus on synthesis involving both Recent advancements various systems summarized synthesized from perspective. Finally, future research prospects discussed.

Language: Английский

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Phase Reconstruction‐Assisted Electron‐Li⁺ Reservoirs Enable High‐Performance Li‐S Battery Operation Across Wide Temperature Range

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 9, 2024

Abstract Lithium‐sulfur batteries (LSBs) are known as high energy density, but their performance deteriorates sharply under high/low‐temperature surroundings, due to the sluggish kinetics of sulfur redox conversion and Li + transport. Herein, a catalytic strategy phase reconstruction with abundant “electron‐Li ” reservoirs has been proposed simultaneously regulate electron exchange. As demo, 1T‐phase lithiation molybdenum disulfide grown on hollow carbon nitride (1T‐Li x MoS 2 /HC 3 N 4 ) is achieved via in situ electrochemical modulation, where 1T‐Li serves an auxiliary “Li source” for facilitating transport HC acts donor electronic supplier. From theoretical calculations, experimental post‐modern analyses, relationship between behaviors mechanism accelerating rate‐determining species deeply understood. Consequently, cells /PP functional separator demonstrate excellent long‐term stabilize areal capacity 6 mAh cm −2 5.0 mg . Even exposed robust surroundings from (60 °C) low (0 temperatures, optimized exhibit high‐capacity retention 76.2% 90.4% after 100 cycles, respectively, pointing out potential application catalysts reconstruction‐assisted LSBs.

Language: Английский

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