Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

A Study of Ferrocene Diffusion in Toluene/Tween 20/1-Butanol/Water Microemulsions for Redox Flow Battery Applications

Journal Article · · Journal of the Electrochemical Society
 [1];  [2];  [2];  [3];  [3];  [4];  [2]
  1. Case Western Reserve Univ., Cleveland, OH (United States); Case Western Reserve University
  2. Case Western Reserve Univ., Cleveland, OH (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Redox flow batteries (RFBs) possess multiple advantages as a flexible energy storage solution. However, RFB researchers are still facing many challenges in finding an appropriate electrolyte. Microemulsions have recently been proposed as a promising alternative RFB electrolyte because of their ability to accommodate organic redox species with fast electron transfer rates that are not soluble in aqueous phase, while still offering the high conductivity of an aqueous salt electrolyte. In this work, we focused on understanding the transport of ferrocene (Fc) in a toluene/Tween 20/1-butanol/water model microemulsion and studied the compositional influence on Fc diffusion. The results show that Fc redistributes among the oil, surfactant, and water microenvironments, and the corresponding diffusion and partition coefficients are quantified. Thus, a tortuous path diffusion model is proposed to describe the mass transport of Fc to an electrode surface. Diffusion coefficients are also obtained by pulsed-field gradient nuclear magnetic resonance (PFG NMR), while the values for Fc diffusion are substantially higher than those from electrochemical measurements, suggesting that they measure samples in different ways. The current contributions from each microenvironment indicate that the Fc permeability is much higher in the oil, even though the electron transfer reaction is likely occurring in the surfactant.
Research Organization:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019409
OSTI ID:
1865178
Report Number(s):
2021.8
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 6 Vol. 168; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (45)

Recent Advancements in All-Vanadium Redox Flow Batteries journal November 2015
Berechnung verschiedener physikalischer Konstanten von heterogenen Substanzen. I. Dielektrizitätskonstanten und Leitfähigkeiten der Mischkörper aus isotropen Substanzen journal January 1935
Redox-Flow Batteries: From Metals to Organic Redox-Active Materials journal November 2016
Tunneling Mode of Scanning Electrochemical Microscopy: Probing Electrochemical Processes at Single Nanoparticles journal May 2018
Vanadium Electrolyte Studies for the Vanadium Redox Battery-A Review journal June 2016
Interpreting diffusion coefficients of electrochemical probes in oil-in-water microemulsions journal August 1996
Study of the Electrochemical Behavior of Biodiesel Microemulsion journal May 2017
Conductivity measurements in nonionic microemulsions journal June 1978
Electrochemical investigations in microemulsion media journal May 1991
Multicomponent diffusion with chemical reactions and its effect in voltammetry journal January 1989
Electrochemistry in association colloids journal January 1994
Microemulsion-based media as novel drug delivery systems journal December 2000
Electrochemistry in bicontinuous microemulsions based on control of dynamic solution structures on electrode surfaces journal October 2016
Diffusion NMR studies of complex liquid formulations journal August 2020
Alpha-tocopherol-based microemulsion improving the stability of carnosic acid and its electrochemical analysis of antioxidant activity journal November 2019
Vanadium redox flow batteries: A comprehensive review journal October 2019
Heterogeneous electron transfer and diffusivities of ferrocene/ferrocenium couple in toluene/phosphonium-based ionic liquid solutions journal March 2013
Redox flow batteries for the storage of renewable energy: A review journal January 2014
Review of zinc dendrite formation in zinc bromine redox flow battery journal July 2020
Diffusion of micelle-bound molecules to electrodes in solutions of ionic surfactants journal July 1988
Electrolyte Lifetime in Aqueous Organic Redox Flow Batteries: A Critical Review journal February 2020
Toward an Inexpensive Aqueous Polysulfide–Polyiodide Redox Flow Battery journal August 2017
Electron Transfer in Microemulsion-Based Electrolytes journal August 2020
On Lifetime and Cost of Redox-Active Organics for Aqueous Flow Batteries journal February 2020
Flow Batteries: Current Status and Trends journal September 2015
Long-Range Electron Tunneling journal February 2014
NMR Chromatography Using Microemulsion Systems journal March 2011
Probing the Microstructure of Nonionic Microemulsions with Ethyl Oleate by Viscosity, ROESY, DLS, SANS, and Cyclic Voltammetry journal July 2012
A metal-free organic–inorganic aqueous flow battery journal January 2014
Microemulsion-based synthesis of nanocrystalline materials journal January 2010
Microemulsion systems for catalytic reactions and processes journal January 2015
The potential of non-aqueous redox flow batteries as fast-charging capable energy storage solutions: demonstration with an iron–chromium acetylacetonate chemistry journal January 2017
Spin Diffusion Measurements: Spin Echoes in the Presence of a Time‐Dependent Field Gradient journal January 1965
Microemulsions in Enhanced Oil Recovery: A Review journal May 2011
Rapid Electron Tunneling Through Oligophenylenevinylene Bridges journal February 2001
Evaluation of Options and Limits of Aqueous All-Quinone-Based Organic Redox Flow Batteries journal January 2020
The Energy Storage Density of Redox Flow Battery Chemistries: A Thermodynamic Analysis journal July 2020
In Situ Reliability Investigation of All-Vanadium Redox Flow Batteries by a Stable Reference Electrode journal December 2020
Improvement of the Battery Performance of Vanadium Flow Battery by Enhancing the Specific Surface Area of the Carbon Felt Electrodes: II. Digging Effect journal March 2021
Advanced Redox-Flow Batteries: A Perspective journal September 2015
Redox Flow Batteries–Reversible Fuel Cells journal December 2015
Performance of a Non-Aqueous Vanadium Acetylacetonate Prototype Redox Flow Battery: Examination of Separators and Capacity Decay journal December 2014
Flow Batteries journal January 2010
Association Constants of Ferrocene with Cyclodextrins in Aqueous Medium Determined by Solubility Measurements of Ferrocene journal July 1998
Electrochemical Investigation of Dynamic Solution Structures of Bicontinuous Microemulsion at Solid Interfaces journal November 2010

Similar Records

Electrolyte effects on the electrochemical performance of microemulsions
Journal Article · Mon Aug 09 20:00:00 EDT 2021 · Electrochimica Acta · OSTI ID:3006938

Decoupling Conductivity and Solubility in Electrolytes Using Microemulsions
Journal Article · Tue Aug 03 20:00:00 EDT 2021 · Journal of the Electrochemical Society · OSTI ID:1860729