Electrochemical Flow Systems Using Redox Mediators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional electrochemical methods for producing liquid chemical products like hydrogen peroxide face challenges due to the mixing of product streams with co-dissolved supporting electrolyte, making purification difficult and energy-intensive, especially for products like hydrogen peroxide which is unstable and kinetically inert.
Innovation Solution
The use of redox mediators in electrochemical flow systems to spatially decouple direct electrochemical processes, allowing for the production of chemical products in solutions with low electrolyte concentrations by transferring active forms of redox mediators between immiscible fluid streams, thereby reducing the need for costly separation processes and enhancing energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional heterogeneous catalysis is used for electrochemical production of liquid products, then the product is produced directly at the electrode surface, but the product stream becomes mixed with co-dissolved supporting electrolyte making purification difficult
Solution Approach 1:
The system divides the electrochemical production process into two separate compartments: an electrochemical cell for generating the active mediator and a reaction module for product formation. This spatial segmentation prevents mixing of the product with supporting electrolyte, enabling easier purification while maintaining production efficiency.
Solution Approach 2:
A redox mediator is introduced as an intermediary substance that carries the electrochemical reaction from the electrode to the product formation zone. The mediator is generated in the electrochemical cell, transferred to the reaction module, and there facilitates product formation without requiring direct contact between the electrode and the final product, thus avoiding electrolyte contamination.
2Use of energy by moving object
If supporting electrolyte is used in electrochemical processes, then electrochemical reactions proceed efficiently, but the final product contains dissolved ionic species requiring energy-intensive separation
Solution Approach 1:
The system extracts the supporting electrolyte from the final product stream by conducting the electrochemical reaction in a separate compartment. The active mediator is transferred to an electrolyte-free or low-electrolyte environment for product formation, effectively taking out the electrolyte before product completion and eliminating the need for energy-intensive separation.
Solution Approach 2:
The invention adds a spatial dimension to the process by using a flow system with distinct zones. The electrochemical cell and reaction module are connected via fluid flow, creating a temporal and spatial separation that allows the product to form in a clean environment after being generated in the electrolyte-containing zone.
3Productivity
If hydrogen peroxide is produced using traditional methods, then it can be synthesized electrochemically, but the product is unstable and difficult to transfer due to contamination
Solution Approach 1:
The production system is segmented into distinct functional zones: hydrogen peroxide is generated in the electrochemical cell and then transferred to a separate reaction module for further processing. This segmentation isolates the unstable product from contaminants during transfer and storage, enhancing stability while maintaining production rate.
Solution Approach 2:
The system changes the chemical environment parameters by transferring the hydrogen peroxide from an electrolyte-rich environment to an electrolyte-free or low-electrolyte environment. This parameter change (removal of ionic species) stabilizes the hydrogen peroxide and makes it easier to handle and transfer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the efficient production of chemical products like hydrogen peroxide with low energetic costs and minimal contamination, achieving high yields in solutions with low ionic species concentrations, thus overcoming the limitations of traditional methods.
Implementation Method 1
applying, in an electrochemical cell, an electrochemical potential to a first electrode in contact with solution from a first fluid stream, the solution comprising a redox mediator, such that an active form of the redox mediator is generated
Implementation Method 2
contacting the solution from the first fluid stream with solution from a second fluid stream, the solution from the first fluid stream being essentially immiscible with the solution from the second fluid stream, such that the active form of the redox mediator reacts with a reactant to produce the chemical product
Data Source
AI summary
Systems and methods for electrochemically producing chemical products are provided. In certain cases, the systems and methods described herein are capable of producing chemical products such as hydrogen peroxide in solutions with relatively low concentrations of electrolyte or other dissolved species at high efficiencies and/or low energetic cost. In some cases, redox mediators are used to spatially decouple direct electrochemical processes from the production of the chemical product.