Triazine‐containing Covalent Organic Polymer‐derived Grid‐Like Multilocular Spheres for Aqueous Supercapacitors

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

Published: Feb. 13, 2025

Abstract Triazine‐containing covalent organic polymers (TCOPs) with unique structures and physicochemical properties are of great potential in energy storage conversion applications, yet how to finely tune the morphology, accessible active sites, enhance capacitive activity remains a challenge. Here, grid‐like multilocular spheres derived from TCOP abundant redox sites fabricated via molecular twist‐induced regulation strategy, which number size cavities can be modulated by changing conformers twisted unit Ostwald ripening time. The structure as‐fabricated results unprecedented high specific capacitance (8412 F g −1 at 1 A ) enables as‐assembled supercapacitor an ultra‐high density 675 Wh kg redox‐active electrolyte (KI‐mixed H 2 SO 4 ), much better than all reported aqueous supercapacitors thus far. It is found that electro‐activity due synergistic effect enhanced accessibility interaction electrolytes. This approach may pave new way precise synthesis COPs tuned for application‐inspired cutting‐edge electrochemical beyond.

Language: Английский

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Fluoride-based hydrogen bond chemistry in a layered double hydroxide cathode toward high-performance aqueous NH ₄ ⁺ storage

Proceedings of the National Academy of Sciences, Journal Year: 2025, Volume and Issue: 122(8)

Published: Feb. 18, 2025

In aqueous ammonium-ion storage, hydrogen bonds play a pivotal role in the reversible insertion/extraction of NH 4 + within transition metal oxides/hydroxides. Although fluorine (F) is known for its strong electronegativity and potential to form robust with , specific influence on storage remains unexplored. Herein, we systematically investigate effects F-based bond chemistry layered double hydroxide matrix, where F species are introduced subsequently partially removed via an electrochemical method. Our findings demonstrate that while increasing doping content accelerates diffusion due F’s electronegativity, it also triggers crystal shrinkage depresses capacity. To this end, controlled partial removal F, employing lye-assistant strategy, induces expanded interlayer spacing distinct edge lattice tearing, thereby facilitating improved accommodation. The retained sites couple emerging exposed O maintain high bonding capability, which further enhanced by formation highly active, curved hydroxyl groups centered around sites. These manipulations significantly boost performance electrode, providing insights into leveraging strongest developing high-performance energy devices.

Language: Английский

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MXene‐Integrated Perylene Anode with Ultra‐Stable and Fast Ammonium‐Ion Storage for Aqueous Micro Batteries

Advanced Science, Journal Year: 2023, Volume and Issue: 11(1)

Published: Nov. 14, 2023

The aqueous micro batteries (AMBs) are expected to be one of the most promising energy storage devices for its safe operation and cost-effectiveness. However, performance AMBs is not satisfactory, which attributed strong interaction between metal ions electrode materials. Here, first developed with NH

Language: Английский

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Nanostructured ZnCo₂O₄@NiMn-LDH Electrodes for Supercapacitor and Zinc-Air Battery Application

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(11), P. 13649 - 13663

Published: June 6, 2024

Herein, we have developed a two-step hydrothermal reaction to fabricate core–shell nanostructured ZnCo2O4@NiMn-LDH on nickel foam. The electrode material composition is optimized by different feed ratios of Ni in the shell structure, which composed NiMn-LDH. In three-electrode electrochemical analysis, (2:1) exhibited specific capacitance 5165 F/g at current density 1 A/g 6 M KOH electrolyte. Moreover, rate capability retention reached 80% 4 A/g. Finally, solid-state asymmetric supercapacitor assembled using as positive and α-Fe2O3 negative placed inside Swagelok cell device with separator. fabricated (2:1)||α-Fe2O3 exhibits an energy 64.6 Wh/kg power 748 W/kg cyclic stability 97.9% after 3000 cycles. For zinc–air battery (ZAB) application, delivered lower overpotential 390 mV 50 mA/cm2 good alkaline medium. It 43 mW/cm2 throughout 200 h. Both applications suggest that considered efficient for applications.

Language: Английский

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Engineering the microstructures of manganese dioxide coupled with oxygen vacancies for boosting aqueous ammonium-ion storage in hybrid capacitors

Rare Metals, Journal Year: 2024, Volume and Issue: 43(11), P. 5734 - 5746

Published: July 2, 2024

Language: Английский

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