Covalent Organic Framework with Highly Accessible Carbonyls and π‐Cation Effect for Advanced Potassium‐Ion Batteries

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(10)

Published: Jan. 15, 2022

Covalent organic frameworks (COF) possess a robust and porous crystalline structure, making them an appealing candidate for energy storage. Herein, we report exfoliated polyimide COF composite (P-COF@SWCNT) prepared by in situ condensation of anhydride amine on the single-walled carbon nanotubes as advanced anode potassium-ion batteries (PIBs). Numerous active sites exposed various open pathways promote highly efficient ion diffusion P-COF@SWCNT while preventing irreversible dissolution electrolyte. During charging/discharging process, K+ is engaged carbonyls imide group naphthalene rings through enolization π-K+ effect, which demonstrated DFT calculation XPS, ex-situ FTIR, Raman. As result, enables incredibly high reversible specific capacity 438 mA h g-1 at 0.05 A extended stability. The structural advantage more insights into design versatility electrode.

Language: Английский

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Unraveling the Effect of Intrinsic Carbon Defects on Potassium Storage Performance

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(48)

Published: Sept. 28, 2022

Abstract Defects engineering is an attractive strategy to improve the potassium storage performance of carbon anodes. The current studies mainly focus on introduction external defects via heteroatom doping, however, exploration effect intrinsic caused by loss atoms or distortion in crystal lattice still lacking date. Hence, a series materials with different defect levels are developed soft‐template assisted method. It found that content synergistically determined application template and pyrolysis temperature, higher more likely expose enormous edge active sites. This greatly promotes K‐adsorption during surface‐induced capacitive process, therefore strong positive correlation between capacity/capacity retention confirmed. As result, electrode maximum realizes good capacity rate capability long cycle lifespan (225.9 mAh g −1 at 2 A over 2000 cycles). study offers insight into role performance.

Language: Английский

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Ultra-Low-Dose Pre-Metallation Strategy Served for Commercial Metal-Ion Capacitors

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Jan. 29, 2022

Interfacial bonding strategy has been successfully applied to address the high overpotential issue of sacrificial additives, which reduced decompositon potential Na

Language: Английский

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Nitrogen/phosphorus co-doped ultramicropores hard carbon spheres for rapid sodium storage

Carbon, Journal Year: 2023, Volume and Issue: 218, P. 118756 - 118756

Published: Dec. 19, 2023

Language: Английский

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Enabling highly-efficient and stable potassium-ion storage by exposing atomic-dispersed super-coordinated antimony O₂Sb₁N₄ sites on N-doped carbon nanosheets

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(5), P. 2153 - 2166

Published: Jan. 1, 2023

A viable anode of atomic Sb with a super-coordinated O 2 1 N 4 structure anchored on N-doped micropore carbon nanosheets (O–Sb–N SA@NC) is developed, demonstrating significantly enhanced performance in both half and full potassium-ion batteries.

Language: Английский

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A generic F-doped strategy for biomass hard carbon to achieve fast and stable kinetics in sodium/potassium-ion batteries

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 490, P. 151636 - 151636

Published: April 24, 2024

Language: Английский

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Incorporation of edge-N into La-doped hierarchical carbon framework enables high-efficiency phosphate electrosorption: Boosting accessible active centers and bridging charge transfer paths

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148518 - 148518

Published: Jan. 3, 2024

Language: Английский

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Topological Defect‐Regulated Porous Carbon Anodes with Fast Interfacial and Bulk Kinetics for High‐Rate and High‐Energy‐Density Potassium‐Ion Batteries

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(30)

Published: April 22, 2024

Abstract Carbonaceous materials are regarded as one of the most promising anodes for potassium‐ion batteries (PIBs), but their rate capabilities largely limited by slow solid‐state potassium diffusion kinetics inside anode and sluggish interfacial ion transfer process. Herein, high‐rate high‐capacity PIBs demonstrated facile topological defect‐regulation microstructure carbon anodes. The lattice as‐obtained porous nanosheets (CNSs) with abundant defects (TDPCNSs) holds relatively high adsorption energy yet low migration barrier, thereby enabling efficient storage graphitic layers. Moreover, can induce preferential decomposition anions, leading to formation conductive solid electrolyte interphase (SEI) film decreased de‐solvation barrier. Additionally, dominant sp 2 ‐hybridized conjugated skeleton TDPCNSs enables electrical conductivity (39.4 S cm −1 ) potential. As a result, as‐constructed demonstrates capacity (504 mA h g at 0.1 A ), remarkable capability (118 40 well long‐term cycling stability.

Language: Английский

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Edge-enrich N-doped graphitic carbon: Boosting rate capability and cyclability for potassium ion battery

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 432, P. 134321 - 134321

Published: Dec. 24, 2021

Language: Английский

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Single‐Atom Vanadium Catalyst Boosting Reaction Kinetics of Polysulfides in Na–S Batteries

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(8)

Published: Nov. 11, 2022

The practical application of the room-temperature sodium-sulfur (RT Na-S) batteries is hindered by insulated sulfur, severe shuttle effect sodium polysulfides, and insufficient polysulfide conversion. Herein, on basis first principles calculations, single-atom vanadium anchored a 3D nitrogen-doped hierarchical porous carbon matrix (denoted as 3D-PNCV) designed fabricated to enhance sulfur reactivity, adsorption catalytic conversion performance polysulfide. 3D-PNCV host with abundant active V sites, structure, high electrical conductivity, strong chemical adsorption/conversion ability V-N bonding can immobilize polysulfides promote reversibly toward Na2 S. Therefore, as-fabricated RT Na-S achieve reversible capacity (445 mAh g-1 over 800 cycles at 5 A ) excellent rate capability (224 10 ). electrocatalysis mechanism further experimentally theoretically revealed, which provides new strategy develop highly stable batteries.

Language: Английский

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