A Bilayer Electrode Architecture Enabling SnO<sub>2</sub>-Induced Spatial-Controllable Zinc Deposition for Ultra-High-Areal-Capacity Zinc-Based Flow Batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41612601.
- Also identified by DOI 10.1002/adma.202521391.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Aqueous zinc-based flow batteries (ZFBs) show great promise for large-scale energy storage. However, the practical deployment of ZFBs is hindered by a limited areal capacity, due to uncontrolled zinc deposition and low utilization of electrode volume. Herein, we propose a spatially controllable deposition strategy enabled by a bilayer electrode architecture, featuring a SnO<sub>2</sub>-functionalized carbon felt (CF) as the bottom layer and a pristine CF as the top layer. This architecture introduces a steep gradient in nucleation overpotential and zincate affinity that counteracts the ionic migration trend, reversing the deposition behavior from surface-clogging mode to internal-to-external filling. This unique mechanism enables an ultrahigh areal capacity of 330 mAh cm<sup>-2</sup> and an ultrahigh volumetric capacity of 1100 mAh cm<sup>-3</sup>, representing a 65% improvement over conventional electrodes. Even under a harsh condition of 100% state of charge and 100% depth of discharge at 240 mAh cm<sup>-2</sup>, the battery demonstrates exceptional durability over 175 cycles. This work significantly expands volume utilization for zinc deposition via a bilayer electrode design, providing a robust strategy for regulating spatial deposition behavior and paving the way for practical high-areal-capacity ZFBs.