Redox Flow
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Investigation of Charge Transfer Mechanisms on Redox Active Polymers Using RDE and SECM
This study is a first step to evaluate rate determining processes on the electrochemical activity of RAPs. Using different electrochemical techniques we determined the presence of several preceding chemical steps. We also studied how the resulting RAP film mediates the charge transfer process and affects the electrochemical behavior of RAPs. Read More
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Evolutionary Design of Low Molecular Weight Organic Anolyte Materials for Applications in Nonaqueous Redox Flow Batteries
All-organic anolyte materials for nonaqueous redox flow batteries with high stability at all redox states were designed through an iterative study. Anolyte materials exhibit two chemically reversible reductions, have low equivalent weights of only 111 g/mol/e–, undergo reversible electro-chemistry in Li-ion supporting electrolytes, and are stable in solution for greater than 2 months without detectable decomposition. Read More
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Evaluation of Tris-Bipyridine Chromium Complexes for Flow Battery Applications: Impact of Bipyridine Ligand Structure on Solubility and Electrochemistry
Synthesis of 24 Cr-bipyridine complexes across two different oxidation states; their solubility varies from insoluble to 0.7 M. Most of the complexes undergo reversible electrochemistry demonstrating up to six reversible redox couples. Read More
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Estimating the System Price of Redox Flow Batteries for Grid Storage
This work conducted a techno-economic analysis of a prospective production process for an aqueous all vanadium flow battery and a nonaqueous lithium polysulfide flow battery. Read More
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A Subtractive Approach to Molecular Engineering of Dimethoxybenzene-based Redox Materials for Nonaqueous Flow Batteries
A series of methyl-substituted 1,4-dimethoxybenzene derivatives were developed via a subtractive design approach through reengineering of DBBB. 23DDB and 25DDB demonstrated desirable electrochemical and physical characteristics for nonaqueous redox flow batteries with intrinsic capacities at 161 mAh/g. Read More
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Chemical Doping Enhances Electronic Transport in Networks of Hexabenzocoronenes Assembles in Electrolyte
Organic semiconductors provide well-behaved charge transport in the solid state, but have not been studied in solution. Here, it is shown that upon chemical oxidation, hexabenzocoronenes (HBCs) enhance charge transport in non-aqueous electrolyte. Read More
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Biphasic Electrode Suspensions for Li-Ion Semi-Solid Flow Cells with High Energy Density, Fast Charge Transport, and Low-Dissipation Flow
We created biphasic electrode suspensions composed of dispersed active particles and uniformly percolated conductive particles, different from the clustered suspensions using traditional suspension preparation procedures. Read More
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Complexes Containing Redox Non-Innocent Ligands for Symmetric, Multi-Electron Transfer Non-Aqueous Redox Flow Batteries
Designed and synthesized functionalized chromium-bipyridine complexes with high solubilities that undergo up to 6 electron transfers over a ~2 V window Read More
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Radical Compatibility with Nonaqueous Electrolytes and Its Impact on an All-Organic Redox Flow Battery
A new nonaqueous all-organic redox flow chemistry was developed with a cell voltage of ~2.4V, energy efficiency of >70%, and operational current density of >10mA/cm2. Electron spin resonance (ESR) study reveals that the chemical stability of both charged organic radical species dictates the cycling stability of flow cells and is highly dependent on the supporting solvents and salts. Read More
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Natural Abundance 17O Nuclear Magnetic Resonance and Computational Modeling Studies of Lithium Based Liquid Electrolytes
A high sensitivity NMR probe was developed at ultra-high field, allowing 17O NMR spectra on electrolytes acquired at concentration as low as about 20 mM. Read More
Latest Updates
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You’re Invited - JCESR and Beyond: Translating the Basic Science of Batteries
Please join us at Argonne National Laboratory on Tuesday, April 4, 2023 for JCESR and Beyond: Translating the Basic Science of Batteries. Registration is now open. This in-person event will celebrate 10 years of research from the Joint Center… Read More
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A Message from JCESR: In Memory of George Crabtree
It is with heavy hearts that we say goodbye to George Crabtree, a Senior Scientist and Distinguished Fellow at Argonne National Laboratory, and Director of the Joint Center for Energy Storage Research (JCESR), who passed away unexpectedly on January 23. Dr. Read More
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Cyanopyridines As Extremely Low-Reduction-Potential Anolytes for Nonaqueous Redox Flow Batteries
Discovery of a cyanophenylpyridine derivative with a very low reduction potential and good stability during cycling. Read More
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Characterizing Redoxmer – Electrode Kinetics Using a SECM-Based Spot Analysis Method
Identified asymmetries in electron transfer (ET) kinetics between the reduction and oxidation of ferrocene-based redoxmers by measuring the ET rate constants (kf/kb) as a function of electrode potential. Read More
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Benzotriazoles as Low Potential Anolytes for Non-Aqueous Redox Flow Batteries
We developed an easy-to-synthesize benzotriazole-based anolyte with a high energy redox potential (-2.3 V vs Fc/Fc+) and high solubility that demonstrates stable electrochemical cycling performance. Read More
