Revealing the Valence Evolution of Metal Element in Heterostructures for Ultra‐High Power Li‐Ion Capacitors

Advanced Energy Materials, Год журнала: 2023, Номер 13(35)

Опубликована: Июль 27, 2023

Abstract The difficulty in matching cathode and anode kinetics due to slow ion transport anodes constrains the development of lithium‐ion capacitors. Heterogeneous structures with built‐in electric field can promote migration improve reaction kinetics. However, valence evolution metal elements heterostructures during charging/discharging processes is often overlooked. Inspired by theoretical calculations, transition selenides (FeSe 2 /CoSe ) low energy barriers ( E b = 0.35 eV) are successfully engineered fabricated. As expected, designed heterostructure material exhibits outstanding rate performance (512 mAh g −1 at 30 A ultra‐high pseudocapacitance contribution (98.02% 1.0 mV s ), exceeding state‐of‐the‐art values for anodes. Impressively, synchrotron X‐ray absorption spectroscopy (SXAS) ex situ XPS find that states Fe Co heterogeneous structure gradually increase as charging discharging proceeds, inducing a continuous climb reversible specific capacity, while further reducing barrier 0.20 eV). This work reveals iron cobalt providing guidance improving revealing capacity rise mechanism other compounds.

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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