Directionally Modulated Zinc Deposition by a Robust Zincophilic Cu-Phthalocyanine Protective Layer in Dendrite-Free Aqueous Zinc Ion Batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40468608.
- Also identified by DOI 10.1002/adma.202503086 and PMC identifier 12369688.
- Licence recorded as CC BY-NC-ND.
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Abstract
The directional modulation of zinc (Zn) deposition with further investigation of the dendrite-formation mechanism is vital in artificial anode protective layer for aqueous Zn-ion batteries (AZIBs). Herein, a robust metalated covalent organic framework (CuPc-COF) used as the artificial anode protective layer is proposed, in which the zincophilic sites of π-conjugated periodic skeletons are precisely designed to modulate the directional migration of Zn<sup>2+</sup>, the multiple redox-active sites facilitate the Zn<sup>2+</sup> confinement and transfer, and the central metal copper (Cu) serves as the inhibitor to eliminate the hydrogen evolution side reactions. By combining theoretical calculations with experiments, the π-conjugated planar CuPc-COF layer is a desired protective coating of AZIB anodes with directionally transport channels and abundant redox active sites, thus inducing two-dimensional deposition of Zn. Attributed to these superiorities, the fabricated CuPc-COF@Zn anode demonstrates excellent cycling lifespan in both symmetrical cell (exceeding 2500 h at 1 mA cm<sup>-2</sup>) and full cell with different cathodes (more than 3000 cycles at 1 A g<sup>-1</sup>), outperforming most reported zinc anodes with COF-based layers.