POM Anolyte for All-Anion Redox Flow Batteries with High Capacity Retention and Coulombic Efficiency at Mild pH
© 2022 Wiley-VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 7 vom: 05. Feb., Seite e2107425 |
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| Weitere Verfasser: | , , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article in-operando electrochemical Raman redox flow battery redox-active polyoxometalate |
| Zusammenfassung: | © 2022 Wiley-VCH GmbH. A highly soluble Li5 BW12 O40 cluster delivers 2 e- redox reaction with fast electron transfer rates (2.5 × 10-2 cm s-1 ) and high diffusion coefficients (≈2.08 × 10-6 cm2 s-1 ) at mild pH ranging from 3 to 8. In-operando aqueous-flowing Raman spectroscopy and density functional theory calculations reveal that Raman shift changing of {BW12} clusters is due to the bond length changing between W-Ob -W and W-Oc -W at different redox states. The structure changing and redox chemistry of Li5 BW12 O40 are highly reversible, which makes the Li5 BW12 O40 cluster versatile to construct all-anion aqueous redox flow batteries (RFBs). The cation-exchange Nafion membrane will also repel the cross permeability of the anion redox couples. Consequently, by coupling with Li3 K[Fe(CN)6 ] catholyte, the aqueous RFB can be operated at pH 8 with a capacity retention up to 95% and an average Coulombic efficiency more than 99.79% over 300 cycles within 0 to 1.2 V. Meanwhile, Li5 BW12 O40 cluster can also be paired with LiI catholyte to form aqueous RFBs at pH 7 and pH 3, the capacity retention of 94% and 90% can be realized over 300 cycles within 0 to 1.3 V |
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| Beschreibung: | Date Revised 17.02.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202107425 |