Forward Osmosis Membrane for CO2 Conversion Product Concentration
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Solution Overview
Problem
Existing electrochemical CO2 conversion systems face limitations in in situ product concentration and overall production yield due to low solubility of CO2 in aqueous electrolytes and sluggish mass transport, necessitating energy-intensive post-treatment processes.
Innovation Solution
Integration of a forward osmosis membrane at the cathode-desalination interface to create an osmotic gradient, facilitating water transfer from the cathode chamber into a central desalination chamber, thereby concentrating CO2 conversion products in situ without the need for additional energy-intensive post-treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrochemical CO2 conversion systems are used, then CO2 conversion products are produced, but the in situ product concentration remains low due to low solubility of CO2 in aqueous electrolytes and sluggish mass transport
Solution Approach 1:
The patent extracts water from the cathode chamber using an osmotically driven dewatering system. By placing a forward osmosis membrane at the cathode interface and applying an osmotic gradient, water is selectively removed from the reaction chamber, thereby concentrating the CO2 conversion products in situ without requiring additional post-treatment processes.
Solution Approach 2:
The patent changes the water content parameter in the cathode chamber by implementing an osmotically driven dewatering system. This system dynamically adjusts the water concentration in the electrolyte, thereby increasing the concentration of CO2 conversion products and improving overall production yield.
2Quantity of substance
If conventional electrochemical CO2 conversion systems are used, then CO2 conversion products are produced, but energy-intensive post-treatment processes are required to concentrate the products
Solution Approach 1:
The system performs self-concentration of CO2 conversion products through the osmotically driven dewatering mechanism. The forward osmosis membrane automatically removes water from the cathode chamber based on the osmotic gradient, concentrating products in situ without requiring external energy input for post-treatment concentration processes.
Solution Approach 2:
The patent extracts water selectively from the cathode chamber using the forward osmosis membrane, leaving the CO2 conversion products concentrated in the remaining electrolyte. This extraction process eliminates the need for energy-intensive post-treatment concentration steps.
3Quantity of substance
If a forward osmosis membrane is integrated at the cathode-desalination interface, then water transfer is facilitated from the cathode chamber into the desalination chamber, but system complexity increases
Solution Approach 1:
The forward osmosis membrane integrated at the cathode-desalination interface serves multiple functions: it acts as a selective barrier for water transfer, maintains the osmotic gradient, and facilitates in situ product concentration. This multi-functional component reduces the need for separate concentration equipment, thereby managing system complexity.
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
Enhances Faradaic efficiency and product concentration of CO2 conversion products by eliminating the need for downstream post-treatment steps, achieving significant improvements in product yield and efficiency under ambient conditions.
Implementation Method 1
A forward osmosis membrane (FOM) is positioned at the interface between the cathode chamber and the first desalination cell, in place of a terminal cation exchange membrane (CEM), thereby creating an osmotic gradient during electrochemical desalination to facilitate water transfer from the cathode chamber into the desalination chamber and concentrate the CO2 conversion product in situ.
Data Source
AI summary
A system and method are disclosed for increasing the production yield of CO2 conversion products in an electrochemical reactor assisted by an osmotically driven dewatering system. The system comprises an electrochemical cell including a cathode chamber, an anode chamber, and a central desalination chamber. The cathode chamber includes a cathode active material, and the anode chamber includes an anode active material. The central desalination chamber comprises a plurality of desalination cells, each featuring alternating anion exchange membranes (AEMs) and cation exchange membranes (CEMs). A forward osmosis membrane (FOM) is integrated at the interface between the cathode chamber and the adjacent desalination cell, replacing the conventional terminal CEM. This configuration establishes an osmotic gradient that drives water flux from the cathode chamber into the desalination chamber, thereby concentrating the CO2 conversion product (e.g., formate) in situ and enhancing Faradaic efficiency without requiring post-treatment.