Hydrogen Evolution Inhibition via Dual Functional Electrolyte Additive to Achieve Highly Stable Aqueous Fe Ion Battery DOI

Yahao Li,

Zhenguo Cui, Lulu Zhang

et al.

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

Published: April 9, 2025

Abstract Iron‐ion battery (FeIB) is a promising energy storage system for future grid applications due to the low cost and abundance of iron. However, owing serious hydrogen evolution reaction (HER) during cycling, Coulombic efficiency (CE) iron‐ion batteries relatively low. Herein, ascorbic acid (VC) employed as an electrolyte additive suppress HER enhance CE long‐term stability FeIB. Theoretical calculations experimental results indicate that VC can regulate d‐band center Fe substrate, fix active H + , thus inhibit HER. Meanwhile, it also fine‐tune solvation structure ions by enhancing electrostatic potential. Therefore, Fe||Fe symmetric cell with modified exhibits ultralong stable cycling performance up 1300 h average 94%. The Fe|| Prussian Blue full excellent rate cycle stability. This study provides new perspective achieving high reversibility batteries.

Language: Английский

Conductive Polymer Coatings Control Reaction Selectivity in All‐Iron Redox Flow Batteries DOI Creative Commons
Emre B. Boz, Ameya Bondre, Ronald de Bruijne

et al.

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

Published: April 1, 2025

Abstract Aqueous all‐iron redox flow batteries are an attractive and economic technology for grid‐scale energy storage owing to their use of abundant environmentally benign iron as the active material water solvent. However, battery operation is challenged by plating/stripping reactions competing hydrogen evolution reaction at negative electrode, which hinder performance durability. Here, selectivity electrode tailored introducing conductive polymer coatings onto porous carbonaceous electrodes. Two polymers, poly(3,4‐ethylenedioxythiophene) (PEDOT) poly(pyrrole) (PPy) conformally coated with dopant poly(4‐styrenesulfonate) (PSS) resulting electrochemistry studied on model electroanalytical platforms batteries. Both polymers decrease current rotating disc electrodes, PPy/PSS strongly inhibiting high overpotentials. In full cells, coating extends cyclability significantly reduces evolution, while PEDOT/PSS improves round‐trip efficiency, possibly acting a shuttle stripping reaction. These findings motivate broader investigation implementation engineer other electrochemical technologies.

Language: Английский

Citations

0
Hydrogen Evolution Inhibition via Dual Functional Electrolyte Additive to Achieve Highly Stable Aqueous Fe Ion Battery DOI

Yahao Li,

Zhenguo Cui, Lulu Zhang

et al.

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

Published: April 9, 2025

Abstract Iron‐ion battery (FeIB) is a promising energy storage system for future grid applications due to the low cost and abundance of iron. However, owing serious hydrogen evolution reaction (HER) during cycling, Coulombic efficiency (CE) iron‐ion batteries relatively low. Herein, ascorbic acid (VC) employed as an electrolyte additive suppress HER enhance CE long‐term stability FeIB. Theoretical calculations experimental results indicate that VC can regulate d‐band center Fe substrate, fix active H + , thus inhibit HER. Meanwhile, it also fine‐tune solvation structure ions by enhancing electrostatic potential. Therefore, Fe||Fe symmetric cell with modified exhibits ultralong stable cycling performance up 1300 h average 94%. The Fe|| Prussian Blue full excellent rate cycle stability. This study provides new perspective achieving high reversibility batteries.

Language: Английский

Citations

0