Related Experiment Video
Updated: Oct 2, 2025
09:49
A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
10.6K
In operando visualization of redox flow battery in membrane-free microfluidic platform
Hyungjoo Park1, Giyun Kwon2,3, Hyomin Lee4
1Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Summary
Redox flow batteries (RFBs) performance was enhanced by visualizing electrokinetic phenomena in a membrane-free microfluidic system. This study clarifies reaction mechanisms and optimizes electrode design for better energy storage.
Area of Science:
- Electrochemistry
- Energy Storage
- Chemical Engineering
Background:
- Redox flow batteries (RFBs) are key for large-scale energy storage, but their complex reaction mechanisms, governed by electrochemistry and hydrodynamics, require further understanding.
- Real-time observation techniques are essential to elucidate the intricate electrokinetic phenomena governing RFB performance.
- The 5,10-bis(2-methoxyethyl)-5,10-dihydrophenazine (BMEPZ) molecule shows promise as a high-performance catholyte in RFBs.
Purpose of the Study:
- To investigate the reaction mechanisms in RFBs using in operando visualization.
- To analyze the electrokinetic properties of the BMEPZ catholyte within a membrane-free microfluidic RFB.
- To correlate electrochemical and hydrodynamic behaviors for improved RFB design.
Main Methods:
- Development and utilization of a membrane-free microfluidic RFB platform for in operando studies.
- Employing visualization techniques to observe electrokinetic phenomena in real-time.
- Characterizing charge and mass transfer kinetics of the BMEPZ catholyte during multiredox reactions.
Main Results:
- In operando visualization revealed intrinsic electrochemical properties and kinetics of BMEPZ.
- The study provided insights into electrokinetic limitations within the RFB system.
- Theoretical analysis of physicochemical hydrodynamics was enabled through experimental observations.
Conclusions:
- The membrane-free microfluidic RFB platform facilitates detailed understanding of reaction mechanisms.
- Optimized electrode geometry, informed by these insights, can suppress depletion regions and enhance cell performance.
- This approach advances the design and efficiency of large-scale energy storage systems.
Keywords:
electrochemistry and hydrodynamicsin operando visualizationin-depth studymembrane-free redox flow batterymultiredox organic moleculeMore Related Videos
11:23A Multilayer Microfluidic Platform for the Conduction of Prolonged Cell-Free Gene Expression
Published on: October 6, 2019
10.4K
13:42Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
Published on: September 19, 2017
11.9K
Related Concept Videos
02:47Voltaic/Galvanic Cells
58.8K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
58.8K
01:15Potentiometry: Membrane Electrodes
847
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
847
01:23Redox Equilibria: Overview
1.2K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.2K
01:32Chemiosmosis
103.9K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
103.9K
03:00Electrolysis
27.8K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
27.8K
01:30Ladder Diagrams: Redox Equilibria
548
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
548