Flexible Iron-Ion Hybrid Capacitor Based on a MnO2 Electrode

Aqueous Fe-ion hybrid capacitors, with high safety, low cost, and environmental friendliness, have attracted considerable attention as an emerging energy storage device. However, Fe-ion-based energy storage systems still face challenges, such as narrow voltage windows, limited energy density, and ha...

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Publié dans:Langmuir : the ACS journal of surfaces and colloids. - 1985. - 41(2025), 33 vom: 26. Aug., Seite 22011-22019
Auteur principal: Zhang, Ke (Auteur)
Autres auteurs: Bai, Yafeng, Wang, Liying, Zhang, Shuli, You, Zhuo, Yang, Xijia, Lü, Wei
Format: Article en ligne
Langue:English
Publié: 2025
Accès à la collection:Langmuir : the ACS journal of surfaces and colloids
Sujets:Journal Article
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520 |a Aqueous Fe-ion hybrid capacitors, with high safety, low cost, and environmental friendliness, have attracted considerable attention as an emerging energy storage device. However, Fe-ion-based energy storage systems still face challenges, such as narrow voltage windows, limited energy density, and harsh fabrication conditions. To address these issues, this work fabricates an aqueous Fe-ion hybrid capacitor using low-cost activated carbon as the anode, manganese dioxide (MnO2) as the cathode, with an FeSO4 + NH4Cl aqueous electrolyte, successfully expanding the voltage window to 0-1.2 V. The atomic molecular dynamics simulations confirm the potential of MnO2 as a cathode material, and the spiny nanostructured MnO2 shows a large specific surface area and a stable tunnel structure, which facilitates the intercalation/deintercalation of Fe2+ ions. Consequently, the assembled device achieved a specific capacitance of 835 mF cm-2 at 1 mA cm-2 and a surface energy density of 167 μWh cm-2 with a capacitance retention of 97.2% after 3000 cycles. Furthermore, to meet wearable electronics requirements, a flexible device was assembled by integrating a carboxymethyl cellulose-poly(vinyl alcohol) hydrogel soft-packaging material. The results show that the flexible device exhibits excellent bending resistance. The further assembled flexible Fe-ion supercapacitors demonstrate a high energy storage potential. Under a current density test of 1 mA cm-2, the calculated specific capacitance is 682.4 mF cm-2, and the areal energy density is 136.48 μWh cm-2. The further assembled flexible Fe-ion supercapacitors demonstrate high energy storage potential. Under a current density test of 1 mA cm-2, the calculated specific capacitance is 682.4 mF cm-2, and the areal energy density is 136.48 μWh cm-2. Similarly, in the cycling performance test, the device retains 92.6% of its capacity after 3000 cycles. This study provides technical references for the development and practical application of flexible Fe-ion-based energy storage devices 
650 4 |a Journal Article 
700 1 |a Bai, Yafeng  |e verfasserin  |4 aut 
700 1 |a Wang, Liying  |e verfasserin  |4 aut 
700 1 |a Zhang, Shuli  |e verfasserin  |4 aut 
700 1 |a You, Zhuo  |e verfasserin  |4 aut 
700 1 |a Yang, Xijia  |e verfasserin  |4 aut 
700 1 |a Lü, Wei  |e verfasserin  |4 aut 
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773 1 8 |g volume:41  |g year:2025  |g number:33  |g day:26  |g month:08  |g pages:22011-22019 
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