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Phosphonate-based iron complex for a cost-effective and long cycling aqueous iron redox flow battery
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Phosphonate-based iron complex for a cost-effective and long cycling aqueous iron redox flow battery
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Journal Article
Phosphonate-based iron complex for a cost-effective and long cycling aqueous iron redox flow battery
2024
Overview
A promising metal-organic complex, iron (Fe)-NTMPA
2
, consisting of Fe(III) chloride and nitrilotri-(methylphosphonic acid) (NTMPA), is designed for use in aqueous iron redox flow batteries. A full-cell testing, where a concentrated Fe-NTMPA
2
anolyte (0.67 M) is paired with a Fe-CN catholyte, demonstrates exceptional cycling stability over 1000 charge/discharge cycles, and noteworthy performances, including 96% capacity utilization, a minimal capacity fade rate of 0.0013% per cycle (1.3% over 1,000 cycles), high Coulombic efficiency and energy efficiency near 100% and 87%, respectively, all achieved under a current density of 20 mA·cm
-
². Furthermore, density functional theory unveils two potential coordination structures for Fe-NTMPA
2
complexes, improving the understanding between the ligand coordination environment and electron transfer kinetics. When paired with a high redox potential Fe-Dcbpy/CN catholyte, 2,2′-bipyridine-4,4′-dicarboxylic (Dcbpy) acid and cyanide (CN) ligands, Fe-NTMPA
2
demonstrates a notably elevated cell voltage of 1 V, enabling a practical energy density of up to 9 Wh/L.
Here, authors report an iron flow battery, using earth-abundant materials like iron, ammonia, and phosphorous acid. This work offers a solution to reduce materials cost and extend cycle life in energy storage applications for grid decarbonization.
