Spatial and Electrostatic Dual‐Confinement in Hierarchical Hollow Bi‐Bi₂O₃@Carbon Nanofibers for Dendrite Suppression and Side Reaction Mitigation in Aqueous Zinc‐Ion Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

Abstract The widespread application of aqueous zinc‐ion batteries (AZIBs) is hindered by anode dendrite formation and side reactions, reducing cycling life performance. This study introduces Bi‐Bi₂O₃‐loaded carbon nanofibers (Bi‐Bi₂O₃@CNF) with hierarchical hollow structures surface grooves fabricated via electrospinning, thermal treatment, in situ growth. Experimental characterization density functional theory reveal that the high area fibrous network Bi‐Bi₂O₃@CNF enhance electron transport electrolyte distribution, effectively ohmic resistance concentration polarization. “Spatial Effect” provides ample space for uniform Zn deposition. Additionally, situ‐grown Bi‐Bi₂O₃, pyridinic nitrogen, pyrrolic C─O─Bi bonds induce strong zinc affinity electronegativity, generating an “Electrostatic Confinement amplifies “spatial effect” into a “Dual‐Confinement Effect.” synergy ensures deposition, suppresses dendrites mitigates Compared to pure anodes, reduces polarization overpotential 17.6%, increases hydrogen evolution 11.52%, maintains Coulombic efficiency 98.8% over 200 h. In full cells, Zn@Bi‐Bi₂O₃@CNF//MnO₂ achieves 73.0% capacity retention after 1000 cycles at mA g⁻¹. work promising strategy high‐efficiency, durable, safe AZIBs offers valuable insights design advanced energy storage materials.

Language: Английский

Enabling a Reversible Six-Electron Redox Reaction Based on I−/I+ and Br−/Br0 for Aqueous Zinc-Bromine Batteries

Chemistry, Journal Year: 2025, Volume and Issue: 7(3), P. 75 - 75

Published: May 2, 2025

Zinc-halogen batteries are usually based on two-electron transfer reactions from X− to X2. However, the halogen is capable of being further oxidized higher valence states, thereby achieving capacity zinc- batteries. Here, a six-electron reaction I−/I+ and Br−/Br0 activated successfully by introducing KI into electrolyte. ZIF-8-derived porous carbon (ZPC), serving as host halogen, effectively suppresses polybromide/polyiodide shuttle owing chemisorption/physical adsorption. Additionally, adsorption I− surface zinc anode inhibits growth dendrites formation by-products. Consequently, zinc-bromine exhibit outstanding electrochemical performance, including specific 345 mAh g−1 at 1 A an excellent retention 80% after 3000 cycles 2 g−1. This strategy provides novel way for enhancing performance zinc-halogen

Language: Английский