In:
Angewandte Chemie, Wiley, Vol. 135, No. 25 ( 2023-06-19)
Abstract:
Aqueous redox flow batteries (ARFBs) are a promising technology for grid‐scale energy storage, however, their commercial success relies on redox‐active materials (RAM) with high electron storage capacity and cost competitiveness. Herein, a redox‐active material lithium ferrocyanide (Li 4 [Fe(CN) 6 ]) is designed. Li + ions not only greatly boost the solubility of [Fe(CN) 6 ] 4− to 2.32 M at room temperature due to weak intermolecular interactions, but also improves the electrochemical performance of [Fe(CN) 6 ] 4−/3− . By coupling with Zn, ZIRFBs were built, and the capacity of the batteries was as high as 61.64 Ah L −1 (pH‐neutral) and 56.28 Ah L −1 (alkaline) at a [Fe(CN) 6 ] 4− concentration of 2.30 M and 2.10 M. These represent unprecedentedly high [Fe(CN) 6 ] 4− concentrations and battery energy densities reported to date. Moreover, benefiting from the low cost of Li 4 [Fe(CN) 6 ], the overall chemical cost of alkaline ZIRFB is as low as $11 per kWh, which is one‐twentieth that of the state‐of‐the‐art VFB ($211.54 per kWh). This work breaks through the limitations of traditional electrolyte composition optimization and will strongly promote the development of economical [Fe(CN) 6 ] 4−/3− ‐based RFBs in the future.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.25
DOI:
10.1002/ange.202304667
Language:
English
Publisher:
Wiley
Publication Date:
2023
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