Tailoring the Structural Evolution of Multi‐Electron Redox Conversions via Strong Selenium–Carbon Interaction for Robust Aqueous Copper‐Ion Batteries DOI Creative Commons
Fan Jiang,

Haoyu Peng,

Yiqian Wu

et al.

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

Published: Feb. 20, 2025

Abstract Aqueous metal‐selenium batteries based on chalcogenide cathodes, despite their multi‐electron conversion‐type redox reactions and rapid kinetics, suffer from short lifespans unclear capacity degradation mechanisms. The interfacial interactions between doped carbon chalcogenides correlate closely with the electrochemical structural evolution. Hence, flower‐like Cu 2−x Se wrapped ultrathin N‐doped layer (Cu Se@N‐C) is synthesized via a simple γ radiation‐pyrolysis route for first time. Se@N‐C cathode displays high‐rate performance long‐term stability, respective of 310.6 mAh g −1 at 20 A retention rate 92.9% after 30 000 cycles over 2000 h 5 . Ex situ X‐ray diffraction photoelectron spectroscopy confirm reversible storage mechanism issues volume expansion oxidative dissolution related to cathode. Furthermore, absorption analysis theoretical calculations reveal presence Se─C Se. As result, physical chemical dual‐protection Se‐C not only effectively stabilizes evolution but also endows it faster electrode reaction kinetics.

Language: Английский

Tailoring the Structural Evolution of Multi‐Electron Redox Conversions via Strong Selenium–Carbon Interaction for Robust Aqueous Copper‐Ion Batteries DOI Creative Commons
Fan Jiang,

Haoyu Peng,

Yiqian Wu

et al.

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

Published: Feb. 20, 2025

Abstract Aqueous metal‐selenium batteries based on chalcogenide cathodes, despite their multi‐electron conversion‐type redox reactions and rapid kinetics, suffer from short lifespans unclear capacity degradation mechanisms. The interfacial interactions between doped carbon chalcogenides correlate closely with the electrochemical structural evolution. Hence, flower‐like Cu 2−x Se wrapped ultrathin N‐doped layer (Cu Se@N‐C) is synthesized via a simple γ radiation‐pyrolysis route for first time. Se@N‐C cathode displays high‐rate performance long‐term stability, respective of 310.6 mAh g −1 at 20 A retention rate 92.9% after 30 000 cycles over 2000 h 5 . Ex situ X‐ray diffraction photoelectron spectroscopy confirm reversible storage mechanism issues volume expansion oxidative dissolution related to cathode. Furthermore, absorption analysis theoretical calculations reveal presence Se─C Se. As result, physical chemical dual‐protection Se‐C not only effectively stabilizes evolution but also endows it faster electrode reaction kinetics.

Language: Английский

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