Enhanced stability of high energy aqueous capacitor based on redox-active nanomaterials and electrolyte
Aina, Sergio (Universidad de Zaragoza) ; Slesinski, Adam ; Cherkaoui, Abdenbi (Universidad de Zaragoza) ; Slesinska, Sylwia ; Lobera, M. Pilar (Universidad de Zaragoza) ; Frackowiak, Elzbieta ; Bernechea, María
Resumen: The incorporation of redox-active species can deliver high-energy-density aqueous electrochemical capacitors by simultaneously enhancing capacitance and voltage. Building on a previously reported double-redox capacitor combining a YP50F porous carbon functionalized with Bi2S3 nanorods (NRs) as the negative electrode, a pristine YP50F positive electrode, and a 1M NaI electrolyte, in this work we investigated the effect of reducing Bi2S3 particle size and increasing its loading. Incorporating 15 % wt. Bi2S3 nanoparticles (NPs) delivered a capacitance of 235 F g−1 at 0.5 A g−1 and 193 F g−1 at 10 A g−1, outperforming the device with a 10 % wt. NPs loading and the NRs-based hybrid at high rates. The energy output of the full cell (18.3 Wh kg−1) surpassed other aqueous devices using carbon-based or other bismuth-based anodes. Despite this improvement, the device lost 20 % of its initial capacitance after only 60 charge-discharge cycles. Electrolyte buffering and pre-iodination of the YP50F in the positive electrode improved the stability, yielding 100 % capacitance retention after 1000 cycles. Post-mortem ex situ XPS analysis revealed that these treatments suppress iodate/periodate formation and prevents oxidation of Bi-S species to sulfates, mitigating corrosion and precipitation, and securing long-term stability.
Idioma: Inglés
DOI: 10.1016/j.jpowsour.2025.238098
Año: 2025
Publicado en: JOURNAL OF POWER SOURCES 657 (2025), 238098 [10 pp.]
ISSN: 0378-7753
Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2023-150574NB-I00
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2023-IyA-01
Tipo y forma: Article (Published version)
Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
Exportado de SIDERAL (2025-10-17-14:31:29)
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Idioma: Inglés
DOI: 10.1016/j.jpowsour.2025.238098
Año: 2025
Publicado en: JOURNAL OF POWER SOURCES 657 (2025), 238098 [10 pp.]
ISSN: 0378-7753
Financiación: info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S
Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2023-150574NB-I00
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2023-IyA-01
Tipo y forma: Article (Published version)
Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2025-10-17-14:31:29)
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Record created 2025-08-29, last modified 2025-10-17