Electrochemical characterization of redox activity and stability of various tris(2,2'-bipyridine) derived complexes of iron(II) in aqueous solutions

Article Energy & Fuels

Isopropyl alcohol and copper hexacyanoferrate boost performance of the iron tris-bipyridine catholyte for near-neutral pH aqueous redox flow batteries

Huyen Bui et al.

Summary: In this study, isopropyl alcohol (IPA) and copper hexacyanoferrate (CuHCF) electrolyte additives were successfully utilized to address the low solubility and poor voltage efficiency of Fe(bpy)(3)(2+/3+) in ARFBs. The additives led to significant improvements in solubility, cycle lifetimes, and voltage efficiency, showcasing the potential for further enhancement of the promising catholyte.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH (2022)

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Article Chemistry, Inorganic & Nuclear

Dimerization of [FeIII(bpy)3]3+ in Aqueous Solutions: Elucidating a Mechanism Based on Historical Proposals, Electrochemical Data, and Computational Free Energy Analysis

Nicolas E. Holubowitch et al.

Summary: This article describes the application of iron(II) tris-bipyridine and its derivatives in aqueous redox flow batteries. The authors studied the mechanism of dimerization of the oxidized form of this compound through experimental and computational research, and proposed methods to reduce the considerable overpotential associated with this process using different materials.

INORGANIC CHEMISTRY (2022)

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Article Chemistry, Physical

A High Potential, Low Capacity Fade Rate Iron Complex Posolyte for Aqueous Organic Flow Batteries

Jinxu Gao et al.

Summary: An iron complex with high redox potential and low capacity fade rate has been reported, demonstrating excellent cycling performance. The investigation provides unprecedented insights into the degradation mechanisms of the iron complex and guides further improvements for energy storage and conversion applications.

ADVANCED ENERGY MATERIALS (2022)

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Article Chemistry, Analytical

Naphthalene diimides (NDI) in highly stable pH-neutral aqueous organic redox flow batteries

Cedrik Wiberg et al.

Summary: This article explores the use of different naphthalene diimides as negative electrolyte materials in aqueous organic redox flow batteries, demonstrating that changing the cation of the supporting electrolyte from potassium to ammonium can reduce capacity losses, and important design strategies include using specific supporting salts and introducing sterically hindering substituents.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY (2021)

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Article Energy & Fuels

Symmetry-breaking design of an organic iron complex catholyte for a long cyclability aqueous organic redox flow battery

Xiang Li et al.

Summary: The authors designed a metal organic complex catholyte material with a tunable redox potential, which shows promise for high-performance aqueous organic redox flow batteries. The material exhibited low capacity fading rate and high solubility during long-term cycling tests, indicating a potential for high energy density storage.

NATURE ENERGY (2021)

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Article Chemistry, Inorganic & Nuclear

A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries

Claudina X. Cammack et al.

Summary: In this study, an established asymmetric RFB was optimized to reduce capacity fade and improve energy efficiency. A series of substituted Fe(bpyR)(3)(BF4)(2) complexes were prepared to potentially achieve a higher voltage RFB. The unsubstituted Fe(bpy)(3)(BF4)(2) exhibited the highest stability and efficiency as a catholyte in both symmetric and asymmetric cells.

DALTON TRANSACTIONS (2021)

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Article Electrochemistry