Journal
ACS ENERGY LETTERS
Volume 6, Issue 7, Pages 2638-2644Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01007
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Funding
- Israeli Ministry of Science and Technology
- Israeli Prime Minister's office
- Israel Committee of High Education
- Israeli Ministry of Energy
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The withdrawal of water molecules from polymeric electrodes during insertion of chaotropic cations is more significant than that upon insertion of kosmotropic cations, which correlates well with the capacity and rate capability of the polyimide electrodes in examined systems and sheds light on their charge storage mechanism.
Among the examined organic electrodes for aqueous mono and multivalent ions batteries, polyimide is considered a promising candidate because of its high capacity and good cyclability in different electrolyte solutions. While most of the studies so far were focused on the energetic performance of polyimide anodes, much less is known about their charge storage mechanism and particularly how such electrodes are affected by the solvation properties of the inserted cations. Using in situ EQCM-D, a direct assessment of the cationic fluxes and their hydration shells inserted/extracted to/from PI electrodes upon potential application was performed for a large variety of mono and multivalent cations. Our observations demonstrated a pronounced withdrawal of water molecules from the polymeric electrodes during insertion of chaotropic cations and significantly less water withdrawal upon insertion of kosmotropic cations. These findings are well correlated with the capacity and the rate capability of the polyimide electrodes in the examined systems and shed light on their charge storage mechanism.
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