Regulating Graphitic Microcrystalline and Single‐Atom Chemistry in Hard Carbon Enables High‐Performance Potassium Storage

Advanced Functional Materials, Год журнала: 2023, Номер 34(12)

Опубликована: Дек. 6, 2023

Abstract Hard carbon (HC) has attracted considerable research interest as the most promising anode for potassium‐ion batteries (PIBs) due to its tunable interlayer spacing and abundant voids accommodate K + . However, practical application of hard is severely hampered by low initial Coulombic efficiency (ICE) high plateau potential. Herein, a manganese ion‐catalyzed pyrolysis strategy explored regulate graphitic microcrystalline structure localized electron distribution in that greatly improve storage ICE. Systematic experimental measurements, situ/ex situ observations, dynamic analysis, density functional theory calculations elucidate introduction Mn 2+ ions could catalyze formation short‐ordered nanodomains provide insertions , meanwhile induce through Mn─N 3 ─C coordination enable diffusion transfer kinetics. Consequently, modulated exhibits low‐potential–plateau capacity, excellent rate capability, potassium half‐cell configurations. More importantly, charge mechanism “adsorption–intercalation” proposed based on correlation between structures discharge/charge plateau. This work provides an in‐depth insight into fundamentals microstructure regulation high‐performance PIBs.

Язык: Английский

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Mechanically flexible V3S4@carbon composite fiber as a high-capacity and fast-charging anode for sodium-ion capacitors

Rare Metals, Год журнала: 2023, Номер 42(8), С. 2633 - 2642

Опубликована: Июнь 12, 2023

Язык: Английский

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Integrating Chemical Pre‐Potassiation with Pre‐Modulated KF‐Rich Electrolyte Interfaces for Dual‐Carbon Potassium Ion Hybrid Capacitor

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(9)

Опубликована: Янв. 9, 2023

Herein, a chemical pre-potassiation strategy via simultaneously treating both glucose derived carbon (GDC) anode and commercial activated (CAC) cathode in potassium-naphthalene-tetrahydrofuran solution is developed for potassium ion hybrid capacitor (PIHC). Combined with situ ex characterizations, radical reaction between reagent electrodes confirmed, which not only deactivates electrochemical irreversible sites, but also promotes to pre-form uniform dense KF-rich electrolyte film on the electrodes. As result, treatment presents multiple advantages: (I) initial Coulombic efficiency (CE) of GDC increases from 45.4 % 84.0 higher rate capability; (II) CAC exhibits improved cycling CEs stability due enhanced resistance oxidation at 4.2 V; (III) assembled PIHC achieves high energy density 172.5 Wh kg-1 life over 10000 cycles.

Язык: Английский

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Synthesis of ultrathin porous g-C3N4 nanofilm via template-free method for photocatalytic degradation of tetracycline

Journal of Alloys and Compounds, Год журнала: 2023, Номер 939, С. 168738 - 168738

Опубликована: Янв. 5, 2023

Язык: Английский

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Recent advances in porous carbons for electrochemical energy storage

New Carbon Materials, Год журнала: 2023, Номер 38(1), С. 1 - 15

Опубликована: Фев. 1, 2023

Язык: Английский

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