Near to neutral pH all-iron redox flow battery based on environmentally compatible coordination compounds

Schröder, Philipp; Aguiló-Aguayo, Noemí; Obendorf, Dagmar; Bechtold, Thomas

doi:10.1016/j.electacta.2022.141042

Cited by 24 publications

(15 citation statements)

References 46 publications

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“…[98] However, for extensive future applications of AIRFBs, neutral electrolytes are preferred as they lower the construction cost of cells. [66] In this regard, exploring active iron species for this work in nearneutral pH conditions may help advance the future application of AIRFBs.…”

Section: Perspectivesmentioning

confidence: 99%

“…One approach to overcoming these issues is to introduce organic ligands to form complexes with iron ions. [13,60,[63][64][65][66][67] For instance, Schroder et al [66] demonstrated a potential redox flow battery at a near to neutral of pH 8.6 using iron(III)-N,N'ethylene-bis-(o hydroxyphenyl glycine), providing an environmentally friendly strategy for the energy storage. The purpose of forming complexes with iron can shift the equilibrium potential to avoid hydrogen evolution and reduce deposition and plating by adding a physical barrier around the iron molecules.…”

Section: All-iron Redox Flow Batteries Function Complications and Pro...mentioning

confidence: 99%

“…[84] Additionally, modifying the structural diversity of organic compounds is expected to tailor the solubility of iron-organic complexes. [66] Employing the same redox-active elements with different coordination [62] Copyright 2021, Royal Society of Chemistry. [75] Copyright 2019 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim.…”

Section: Perspectivesmentioning

confidence: 99%

“…[ 84 ] Additionally, modifying the structural diversity of organic compounds is expected to tailor the solubility of iron‐organic complexes. [ 66 ] Employing the same redox‐active elements with different coordination organic chemistries also promises a pathway to achieve the all‐soluble AIRFBs, such as an iron−triethanolamine redox pair (i.e., [Fe(TEOA)OH] − /[Fe(TEOA)(OH)] [ 2 ]− ) and an iron−cyanide redox pair (i.e., Fe(CN)6 3− /Fe(CN)6 4− ). [ 19 ] Figure 4 summarizes several all‐soluble redox pairs based on iron complexes, along with their corresponding solution pH.…”

Section: Perspectivesmentioning

confidence: 99%

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Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Belongia,

Wang,

Zhang

2023

Adv Funct Materials

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Redox flow batteries (RFBs) are a promising option for long‐duration energy storage (LDES) due to their stability, scalability, and potential reversibility. However, solid‐state and non‐aqueous flow batteries have low safety and low conductivity, while aqueous systems using vanadium and zinc are expensive and have low power and energy densities, limiting their industrial application. An approach to lower capital cost and improve scalability is to utilize cheap Earth‐abundant metals such as iron (Fe). Nevertheless, all‐iron RFBs have many complications, involving voltage loss from ohmic resistance, side reactions such as hydrogen evolution, oxidation, and most significantly electrode plating, and dendrite growth. To address these issues, researchers have begun to examine the effects of various alterations to all‐iron RFBs, such as adding organic ligands to form Fe complexes and using a slurry electrode instead of common materials such as graphite or platinum rods. Overall, progress in improving aqueous all‐iron RFBs is at its infant stage, and new strategies must be introduced, such as the utilization of nanoparticles, which can limit dendrite growth while increasing storage capacity. This review provides an in‐depth overview of current research and offers perspectives on how to design the next generation of all‐iron aqueous RFBs.

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Section: Perspectivesmentioning

confidence: 99%

Section: All-iron Redox Flow Batteries Function Complications and Pro...mentioning

confidence: 99%

Section: Perspectivesmentioning

confidence: 99%

Section: Perspectivesmentioning

confidence: 99%

See 2 more Smart Citations

Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Belongia,

Wang,

Zhang

2023

Adv Funct Materials

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“…Thanks to the natural abundance and low cost of iron (¢0.13 per Ah for Fe), iron-based RFBs recently have attracted extensive attention. [16][17][18][19][20][21][22] With highly soluble FeCl 2 as active species in both half-cells, the all-iron hybrid RFBs fully prevent cross-contamination and endow with a high standard cell voltage of 1.21 V, which promises great potential for gridscale applications. [23][24][25][26][27] However, the longterm stability of all-iron hybrid RFB is still to a great extent, limited by the intrinsically poor Fe anode reversibility in neutral solutions associated with the deposition and dissolution of metallic iron.…”

mentioning

confidence: 99%

Simultaneous Regulation of Solvation Shell and Oriented Deposition toward a Highly Reversible Fe Anode for All‐Iron Flow Batteries

Song

Yan

Hao

et al. 2022

Small

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Developing low‐cost all‐iron hybrid redox flow batteries (RFBs) presents a practical alternative to the high‐cost all‐vanadium RFBs and is deemed vital for grid‐scale energy storage applications. However, the intrinsically poor Fe anode reversibility associated with the deposition and dissolution of metallic iron greatly limits the cycling performance and long‐term stability of all‐iron hybrid RFBs. Herein, a highly reversible and dendrite‐free Fe anode is reported for all‐iron RFBs through regulation of polar solvent dimethyl sulfoxide (DMSO) on FeCl2 anolyte, which simultaneously reshapes Fe2+ solvation structure and induces controllable oriented Fe deposition. Combining both experimental and theoretical analyses, the polar DMSO additives prove effective in replacing H2O molecule from the primary solvation shell of Fe2+ cation via the Fe2+‐O (DMSO) bond and meanwhile induces a fine‐grained Fe nucleation on the preferred Fe (110) plane, which are responsible for the minimized hydrogen evolution and dendrite‐free Fe deposition that significantly enhance Fe anode reversibility. The all‐iron RFB based on the proposed FeCl2‐DMSO anolyte demonstrates an excellent combination of peak power density of 134 mW cm−2, high energy efficiency of 75% at 30 mA cm−2, and high capacity retention of 98.6% over 200 cycles, which presents the best performance of all‐iron RFBs among previously reported research.

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Elucidating the Iron‐Based Ionic Liquid [C₄py][FeCl₄]: Structural Insights and Potential for Nonaqueous Redox Flow Batteries

Balischewski,

Bhattacharyya,

Bailey

et al. 2023

Adv Funct Materials

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In this study, a low‐melting organic‐inorganic crystalline ionic liquid compound, N‐butyl pyridinium tetrachlorido ferrate (III) is described. The material can easily be synthesized using a one‐pot approach in an ionic liquid medium. Single‐crystal X‐ray diffraction confirms that the basic inorganic block is [FeCl4]−, which is counterbalanced by an N‐butyl pyridinium cation. The compound exhibits a melting point of 37.6 °C by differential scanning calorimetry, which is among the lowest values for a pyridinium‐based metal‐containing ionic liquid. The material shows promising electrochemical behavior at room temperature in both aqueous and nonaqueous solvents, and at elevated temperatures in its pure liquid state. Given its appreciable solubility in both water and acetonitrile, the compound can act as a redox‐active species in a supporting electrolyte for redox flow battery applications. These classes of low‐melting ionic solids with long‐range order and interesting electrochemical applications are potential candidates for a range of green energy storage and harvesting systems.

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Near to neutral pH all-iron redox flow battery based on environmentally compatible coordination compounds

Cited by 24 publications

References 46 publications

Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Simultaneous Regulation of Solvation Shell and Oriented Deposition toward a Highly Reversible Fe Anode for All‐Iron Flow Batteries

Elucidating the Iron‐Based Ionic Liquid [C₄py][FeCl₄]: Structural Insights and Potential for Nonaqueous Redox Flow Batteries

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Near to neutral pH all-iron redox flow battery based on environmentally compatible coordination compounds

Cited by 24 publications

References 46 publications

Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Progresses and Perspectives of All‐Iron Aqueous Redox Flow Batteries

Simultaneous Regulation of Solvation Shell and Oriented Deposition toward a Highly Reversible Fe Anode for All‐Iron Flow Batteries

Elucidating the Iron‐Based Ionic Liquid [C4py][FeCl4]: Structural Insights and Potential for Nonaqueous Redox Flow Batteries

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Elucidating the Iron‐Based Ionic Liquid [C₄py][FeCl₄]: Structural Insights and Potential for Nonaqueous Redox Flow Batteries