Organic Solvent Boosts Charge Storage and Charging Dynamics of Conductive MOF Supercapacitors

© 2024 Wiley‐VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 30 vom: 28. Juli, Seite e2403202
Auteur principal: Chen, Ming (Auteur)
Autres auteurs: Wu, Taizheng, Niu, Liang, Ye, Ting, Dai, Wenlei, Zeng, Liang, Kornyshev, Alexei A, Wang, Zhenxiang, Liu, Zhou, Feng, Guang
Format: Article en ligne
Langue:English
Publié: 2024
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article charging dynamics conductive metal–organic frameworks electrical double layer energy storage mechanism organic solvent
Description
Résumé:© 2024 Wiley‐VCH GmbH.
Conductive metal-organic frameworks (c-MOFs) and ionic liquids (ILs) have emerged as auspicious combinations for high-performance supercapacitors. However, the nanoconfinement from c-MOFs and high viscosity of ILs slow down the charging process. This hindrance can, however, be resolved by adding solvent. Here, constant-potential molecular simulations are performed to scrutinize the solvent impact on charge storage and charging dynamics of MOF-IL-based supercapacitors. Conditions for >100% enhancement in capacity and ≈6 times increase in charging speed are found. These improvements are confirmed by synthesizing near-ideal c-MOFs and developing multiscale models linking molecular simulations to electrochemical measurements. Fundamentally, the findings elucidate that the solvent acts as an "ionophobic agent" to induce a substantial enhancement in charge storage, and as an "ion traffic police" to eliminate convoluted counterion and co-ion motion paths and create two distinct ion transport highways to accelerate charging dynamics. This work paves the way for the optimal design of MOF supercapacitors
Description:Date Revised 25.07.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202403202