skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Advanced Energy Materials
ORCiD logo [1];  [2];  [2];  [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [2]
  1. Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
  2. Harvard John A. Paulson School of Engineering and Applied Sciences 29 Oxford Street Cambridge MA 02138 USA
  3. Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA, Harvard John A. Paulson School of Engineering and Applied Sciences 29 Oxford Street Cambridge MA 02138 USA

Abstract An iron complex, tris(4,4′‐bis(hydroxymethyl)‐2,2′‐bipyridine) iron dichloride is reported, which operates at near‐neutral pH with a redox potential of 0.985 V versus SHE. This high potential compound is employed in the posolyte of an aqueous flow battery, paired with bis(3‐trimethylammonio)propyl viologen tetrachloride in the negolyte, exhibiting an open‐circuit voltage of 1.3 V at near‐neutral pH. It demonstrates excellent cycling performance with a low temporal capacity fade rate of 0.07% per day over 35 days of cycling. The extended cycling lifetime is the result of low permeability and improved structural stability of the newly developed iron complex compared to that of the iron tris(bipyridine) complex. The combination of high redox potential and low capacity fade rate compares favorably with those of all previously demonstrated organic and organometallic aqueous posolytes. Extensive investigation into the possible degradation mechanisms, including post‐mortem chemical and electrochemical analyses, indicates that stepwise ligand dissociations of the iron complex are responsible for the reported capacity loss during cell cycling. This investigation provides unprecedented insight to guide further improvements of such metalorganic compounds for energy storage and conversion applications.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AC05‐76RL01830
OSTI ID:
1899729
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 12 Journal Issue: 44; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (49)

Isopropyl alcohol and copper hexacyanoferrate boost performance of the iron tris‐bipyridine catholyte for near‐neutral pH aqueous redox flow batteries journal December 2021
High-performance anthraquinone with potentially low cost for aqueous redox flow batteries journal January 2021
Long-Cycling Aqueous Organic Redox Flow Battery (AORFB) toward Sustainable and Safe Energy Storage journal January 2017
A Long-Lifetime All-Organic Aqueous Flow Battery Utilizing TMAP-TEMPO Radical journal July 2019
A Phosphonate‐Functionalized Quinone Redox Flow Battery at Near‐Neutral pH with Record Capacity Retention Rate journal January 2019
A high Yielding Preparation of 2,2′-Bipyridine-1-Oxide journal August 1998
Investigations Into Aqueous Redox Flow Batteries Based on Ferrocene Bisulfonate journal October 2020
Analysis of Crossover-Induced Capacity Fade in Redox Flow Batteries with Non-Selective Separators journal January 2018
A biomimetic redox flow battery based on flavin mononucleotide journal October 2016
Designer Two-Electron Storage Viologen Anolyte Materials for Neutral Aqueous Organic Redox Flow Batteries journal December 2017
Functioning Water‐Insoluble Ferrocenes for Aqueous Organic Flow Battery via Host–Guest Inclusion journal December 2020
A Water-Miscible Quinone Flow Battery with High Volumetric Capacity and Energy Density journal May 2019
Anthraquinone Flow Battery Reactants with Nonhydrolyzable Water-Solubilizing Chains Introduced via a Generic Cross-Coupling Method journal December 2021
Extremely Stable Anthraquinone Negolytes Synthesized from Common Precursors journal June 2020
A comparative study of all-vanadium and iron-chromium redox flow batteries for large-scale energy storage journal December 2015
Near Neutral pH Redox Flow Battery with Low Permeability and Long‐Lifetime Phosphonated Viologen Active Species journal April 2020
A higher voltage Fe( ii ) bipyridine complex for non-aqueous redox flow batteries journal January 2021
Electrochemical kinetics of the ferri-ferrocyanide couple on platinum journal April 1969
A High Voltage Aqueous Zinc–Organic Hybrid Flow Battery journal May 2019
All-Soluble All-Iron Aqueous Redox-Flow Battery journal May 2016
Photosensitization of TiO 2 by [Fe II (2,2‘-bipyridine-4,4‘-dicarboxylic acid) 2 (CN) 2 ]:  Band Selective Electron Injection from Ultra-Short-Lived Excited States journal February 1998
A redox-flow battery with an alloxazine-based organic electrolyte journal July 2016
A Total Organic Aqueous Redox Flow Battery Employing a Low Cost and Sustainable Methyl Viologen Anolyte and 4-HO-TEMPO Catholyte journal December 2015
Boron Cluster Anions [BnHn]2-(n= 10, 12) in Reactions of Iron(II) and Iron(III) Complexation with 2, 2′-Bipyridyl and 1, 10-Phenanthroline journal July 2014
Studies of Iron-Ligand Complexes for an All-Iron Flow Battery Application journal January 2014
Aspects of electron transfer processes in vanadium redox-flow batteries journal February 2020
Symmetry-breaking design of an organic iron complex catholyte for a long cyclability aqueous organic redox flow battery journal August 2021
In situ electrochemical recomposition of decomposed redox-active species in aqueous organic flow batteries journal June 2022
Novel electrolyte rebalancing method for vanadium redox flow batteries journal February 2021
Improvements to the Coulombic Efficiency of the Iron Electrode for an All-Iron Redox-Flow Battery journal January 2018
Alkaline quinone flow battery journal September 2015
Dimerization of [FeIII(bpy)3]3+ in Aqueous Solutions: Elucidating a Mechanism Based on Historical Proposals, Electrochemical Data, and Computational Free Energy Analysis journal June 2022
Phenothiazine‐Based Organic Catholyte for High‐Capacity and Long‐Life Aqueous Redox Flow Batteries journal April 2019
A High Energy Density Vanadium Redox Flow Battery with 3 M Vanadium Electrolyte journal July 2015
Effect of Chelation on Iron–Chromium Redox Flow Batteries journal April 2020
A Neutral pH Aqueous Organic–Organometallic Redox Flow Battery with Extremely High Capacity Retention journal February 2017
Electricity storage for intermittent renewable sources journal January 2012
Crossover in Membranes for Aqueous Soluble Organic Redox Flow Batteries journal January 2019
Progress in redox flow batteries, remaining challenges and their applications in energy storage journal January 2012
Long-Term Stability of Ferri/Ferrocyanide As an Electroactive Component for Redox Flow Battery Applications: On the Origin of Apparent Capacity Fade journal October 2022
Flow Batteries: Current Status and Trends journal September 2015
Communication—Tris(bipyridyl)iron Complexes for High-Voltage Aqueous Redox Flow Batteries journal June 2020
A stable organic dye catholyte for long-life aqueous flow batteries journal January 2020
Alkaline Quinone Flow Battery with Long Lifetime at pH 12 journal September 2018
Unprecedented Capacity and Stability of Ammonium Ferrocyanide Catholyte in pH Neutral Aqueous Redox Flow Batteries journal January 2019
Extending the Lifetime of Organic Flow Batteries via Redox State Management journal April 2019
Renewable energy resources: Current status, future prospects and their enabling technology journal November 2014
Spin state modulation of iron spin crossover complexes via hydrogen-bonding self-assembly journal January 2013
A metal-free organic–inorganic aqueous flow battery journal January 2014

Similar Records

A Highly Soluble Iron‐Based Posolyte Species with High Redox Potential for Aqueous Redox Flow Batteries
Journal Article · Wed Dec 06 00:00:00 EST 2023 · Advanced Functional Materials · OSTI ID:1899729

Near Neutral pH Redox Flow Battery with Low Permeability and Long-Lifetime Phosphonated Viologen Active Species
Journal Article · Mon Apr 06 00:00:00 EDT 2020 · Advanced Energy Materials · OSTI ID:1899729

Highly Stable, Low Redox Potential Quinone for Aqueous Flow Batteries**
Journal Article · Thu Feb 24 00:00:00 EST 2022 · Batteries & Supercaps · OSTI ID:1899729

Related Subjects