Work

Covalent organic framework composite membrane for long lifespan alkaline zinc-based flow battery

Year: 2025

Type: article

Abstract: Membranes capable of efficient ion transport are highly demanded for separation and energy conversion and storage, such as flow batteries and fuel cells. Beyond the primary benefits of high ion selectivity and conductivity, the ideal membrane must also exhibit robust chemical and physical stability for industrial applications. Herein, we develop a composite membrane (COFs-M) incorporating designed olefin-linked ultramicroporous COF nanosheets (pore size 0.6 nm) with selective ion transport ability and outstanding chemical stability under highly alkaline conditions (6 M NaOH). The COFs-M membrane demonstrates exceptional hydroxide ion transport efficiency, achieving an area resistance of 0.82 Ω cm 2 and facilitating the operation of an alkaline zinc-based flow battery at a remarkable current density of 320 mA cm −2 , achieving a voltage efficiency of 81.56 %. Additionally, the membrane allows the battery to maintain long-cycle stability over 350 cycles with a dendrite-free zinc morphology at a current density of 200 mA cm −2 . • COFs-M membrane is developed for long lifespan alkaline zinc-based flow battery. • Selective ion transport is realized by olefin-linked ultramicroporous COFs-M. • The COFs-M demonstrates high stability under strong alkaline conditions (6 M NaOH). • COFs-M promotes the homogeneous ions flux and dendrite-free zinc deposition.

Source: Chemical Engineering Journal

DOI: 10.1016/j.cej.2025.170123

Authors: Jing Hu, Penghui Zhang, Pengfei Wang, Lingxiao Zhang, Xiwang Zhang

Institutions: Aarhus University, Zhejiang University, State Key Laboratory of Clean Energy Utilization, The University of Queensland

Language: English

Topic: Advanced battery technologies research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,830