Investigation of Fe(II) Complexes with 1,10‐Phenanthroline and 2,2′;6′,2“‐Terpyridine for Aqueous Flow Battery Applications

ChemElectroChem, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

Abstract Iron(II) complexes with 1,10‐phenanthroline (phen) and 2,2′;6′,2“‐terpyridine (terpy) ligands bearing different functional groups (methyl, 4‐pyridyl, chloro, carboxylic acid) were evaluated for aqueous flow battery applications, detecting oxidation processes followed by coupled chemical reactions. Redox potentials of these compounds sufficiently high suitable positive electrolytes (0.88–1.29 V vs. SHE). Randles‐Ševčík equation finite element modelling COMSOL Multiphysics utilized in evaluating the diffusion coefficient apparent rates electron transfer reactions studied cyclic voltammetry. The systems experience weak adsorption reactants at glassy carbon, leading to difficulties determining latter kinetic parameters. Flow tests indicate sufficient performance dimethyl functionalized phenanthroline complex [Fe(II)(DMe‐phen) 3 ] 2+ 0.06 % per cycle (2.78 day) capacity decay. However, , as well [Fe(II)(phen) discharge two thermodynamic conditions, suggesting dimer source lower voltage plateau. energy efficiency was improved cycling higher cut‐off 10 cycles, after which lost recovered one cycle. [Fe(II)(terpy) 2 had too many side be applications.

Language: Английский

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Advances in organic electroactive species for enhancing the performance of all-aqueous redox flow batteries in electrochemical energy storage

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 113, P. 115677 - 115677

Published: Feb. 5, 2025

Language: Английский

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A multi-substituted phenazine derivative aqueous redox flow battery with high energy efficiency and long lifetime

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 633, P. 236461 - 236461

Published: Feb. 8, 2025

Language: Английский

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4,4′-Hydrazobis(1-methylpyridinium) as a Two-Electron Posolyte Molecule for Aqueous Organic Redox Flow Batteries

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 13, 2025

Aqueous organic redox flow batteries (AORFBs) are a safe and sustainable solution for the storage of intermittent renewable energy. While several highly soluble two-electron molecule negolytes have been developed AORFBs, most reported posolyte species exchange only one electron. Herein, readily available 4,4'-hydrazobis(1-methylpyridinium) dichloride (HydBPyMeCl) is described as novel AORFBs. The synthesis HydBPyMeCl was accomplished by three-step process, yielding multiple grams compound. exhibited reversible transfer at high potential (+0.64 V vs Ag/AgCl reference electrode, pH = 0). When evaluated 1 M concentration low (2 HCl) with V3+/V2+ on negative side, showed stability. A capacity retention 99.997% per cycle (99.980% day measured over 70 days) achieved, coupled volumetric specific 47.1 Ah/L (87.2% utilization 80 mA/cm2).

Language: Английский

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Supramolecular Interaction‐Driven Amorphization of Poly(aryl piperidine) Membranes for Enhanced Proton Conductivity

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Abstract Non‐fluorinated polymer membranes offer a commercially feasible solution for redox flow batteries (RFBs), yet their practical applications have been hampered by inherent challenges such as chemical instability and low ionic conductivity. In this study, the development of series ether‐bond‐free poly(aryl piperidine) that address these limitations introducing enhanced disorder in chain packing through supramolecular interactions with organic acids, is presented. These effectively disrupt densely packed chains, transforming proton‐inaccessible crystalline regions into accessible amorphous ones. By eliminating chemically unstable aryl ether bonds avoiding additional modifications, exhibit remarkable long‐term stability. The presence abundant interchain gaps further facilitates rapid proton‐selective transport. As result, engineered demonstrate sustained performance vanadium RFBs, maintaining stable operation over 1000 charge/discharge cycles, achieving an impressive energy efficiency 80% at high current density 280 mA cm − 2 . combination experimental data theoretical modeling suggests membrane's outstanding arises from interconnected widely distributed gaps, which pore‐limiting diameter ≈8 Å. findings robust design strategy developing stable, high‐performance non‐fluorinated RFBs related conversion devices.

Language: Английский

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An aqueous organic flow battery integrating a high-capacity hexaazatrinaphthylene anode with a phenazine anolyte for hybrid energy storage

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 128, P. 117251 - 117251

Published: May 28, 2025

Language: Английский

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