A Covalent Organic Framework As a Dual-active-center Cathode for a High-performance Aqueous Zinc-ion Battery

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2024 Mar 22

PMID 38516068

Authors

Hongbao Li

Mengge Cao

Zhenli Fu

Quanwei Ma

Longhai Zhang

Rui Wang

Fei Liang

Tengfei Zhou

Chaofeng Zhang

Affiliations

Soon will be listed here.

Abstract

Organic electrode materials have shown significant potential for aqueous Zn ion batteries (AZIBs) due to their flexible structure designability and cost advantage. However, sluggish ionic diffusion, high solubility, and low capacities limit their practical application. Here, we designed a covalent organic framework (TA-PTO-COF) generated by covalently bonding tris(4-formylbiphenyl)amine (TA) and 2,7-diaminopyrene-4,5,9,10-tetraone (PTO-NH). The highly conjugated skeleton inside enhances its electron delocalization and intermolecular interaction, leading to high electronic conductivity and limited solubility. The open channel within the TA-PTO-COF provides ionic diffusion pathways for fast reaction kinetics. In addition, the abundant active sites (C[double bond, length as m-dash]N and C[double bond, length as m-dash]O) endow the TA-PTO-COF with a large reversible capacity. As a result, the well-designed TA-PTO-COF cathode delivers exceptional capacity (255 mA h g at 0.1 A g), excellent cycling stability, and a superior rate capacity of 186 mA h g at 10 A g. Additionally, the co-insertion mechanism of Zn/H within the TA-PTO-COF cathode is revealed in depth by spectroscopy. This study presents an effective strategy for developing high-performance organic cathodes for advanced AZIBs.

Citing Articles

A facile self-saturation process enabling the stable cycling of a small molecule menaquinone cathode in aqueous zinc batteries.

Li S, Zhang G, Li Q, He T, Sun X Chem Sci. 2024; .

PMID: 39397829 PMC: 11467759. DOI: 10.1039/d4sc04685d.

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