Electroactive Polymer Membranes for Low-Energy CO2 Enrichment

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Solution Overview

Problem

Existing carbon capture technologies, such as temperature swing processes using aqueous amine absorbents, are energy-intensive and require improvements in polymeric electrolyte membranes for electrochemical cells to efficiently convert low-concentration carbon dioxide streams into higher concentration streams.

Innovation Solution

Development of electroactive polymers with redox-activated functional groups that capture and release carbon dioxide upon application of reducing potential, integrated into polymer electrolyte membranes in electrochemical cells to enhance carbon dioxide enrichment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If temperature swing processes using aqueous amine absorbents are used for CO2 capture, then CO2 can be captured from low-concentration streams, but the process becomes energy-intensive

Engineering Contradiction:

ImproveCO2 capture efficiencyVSAvoidenergy consumption

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The patent replaces the thermal field (temperature swing) with an electrochemical field. Instead of using heat to drive CO2 release, the invention uses electrochemical reduction to activate polymer functional groups for CO2 capture and oxidation for CO2 release, thereby eliminating the energy-intensive heating and cooling cycles of traditional amine-based systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the operating parameters from temperature-based (thermal swing) to electrochemical potential-based control. By applying reducing potentials to activate CO2 capture and oxidizing potentials to release CO2, the system achieves the same separation function with lower energy consumption and more precise control

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional polymeric electrolyte membranes are used in electrochemical cells, then the system structure is simple, but the CO2 enrichment efficiency is insufficient

Engineering Contradiction:

ImproveCO2 enrichment efficiencyVSAvoidpolymer structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent creates composite polymeric electrolyte membranes by combining conventional polymer backbones with electroactive functional groups (such as quinone, hydroquinone, or other redox-active moieties). This composite structure enables the membrane to perform both ion conduction and electrochemical CO2 capture/release functions simultaneously, dramatically improving enrichment efficiency

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The electroactive polymer membrane performs multiple functions: it acts as an ion-conducting electrolyte membrane, a CO2 capture medium through redox-active groups, and a CO2 release mechanism upon potential reversal. This multi-functionality consolidates multiple components into a single integrated membrane, improving efficiency without proportionally increasing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250345757A1Co2 purification with electroactive polymers

Publication Date: 2025.11.13 TWELVE BENEFIT CORP

AI summary

Electroactive polymers having redox activatable moieties pendant from a polymeric backbone, and compositions of the electroactive polymers are disclosed. The polymers are useful in membranes for electrochemical cells, and for facilitation of electrolytically-based carbon dioxide enrichment.