Voltage-Swing Carbon Capture Using Porous Carbons

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Solution Overview

Problem

Current carbon capture technologies face challenges such as high energy costs, low selectivity, and high costs of sorbents like MOFs, which hinder their effectiveness in significantly reducing atmospheric carbon dioxide levels.

Innovation Solution

A voltage-swing method is employed to capture carbon dioxide from gas mixtures using activated carbon as the sorbent. By applying electrical charges to increase selectivity and adsorption, and then removing charges to facilitate low-energy desorption, the system enhances carbon capture efficiency and reduces regeneration energy costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional carbon capture methods (absorption, adsorption, chemical looping) are used, then carbon dioxide can be captured from mixed gases, but high energy costs and low selectivity hinder effectiveness

Engineering Contradiction:

Improvecarbon capture effectivenessVSAvoidenergy cost

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies voltage-swing technology to dynamically change the electrical charge state of porous carbon sorbents between adsorption and desorption phases. By controlling the voltage applied to the sorbent, the system optimizes CO2 capture during adsorption (charged state) and enables low-energy release during desorption (uncharged state), resolving the energy cost contradiction

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system transitions from static sorbent materials to dynamic, voltage-controllable porous carbons. The sorbent's charge state can be switched between charged (high selectivity and adsorption) and uncharged (low energy desorption) states, enabling adaptive optimization of both capture effectiveness and energy consumption

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If sorbents like MOFs are used to increase selectivity, then carbon dioxide capture selectivity improves, but high costs of sorbents hinder scalability

Engineering Contradiction:

ImproveselectivityVSAvoidsorbent cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive MOF sorbents with cheaper porous carbon materials. While individual carbon sorbents have lower inherent selectivity, the voltage-swing technology compensates by enhancing selectivity through controlled charging, achieving high CO2 capture performance at lower material cost

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system changes the electrical parameter (voltage/charge state) of inexpensive porous carbon to achieve selectivity levels previously only attainable with expensive MOFs. This parameter modification enables low-cost sorbents to perform at high-selectivity levels

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional adsorption methods are used, then carbon dioxide can be captured, but low selectivity reduces capture efficiency

Engineering Contradiction:

Improvecapture efficiencyVSAvoidselectivity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent modifies the electrical charge parameter of porous carbon sorbents to dramatically improve selectivity for CO2 over other gases. By controlling the voltage applied to the sorbent, the system achieves high selectivity during the charged adsorption phase, directly resolving the selectivity contradiction

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The electrical charge acts as an intermediary mechanism that enhances the interaction between the sorbent and CO2 molecules. The charged porous carbon creates stronger electrostatic interactions with CO2, improving selectivity and capture efficiency without requiring expensive specialized materials

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The voltage-swing method significantly increases the selectivity and adsorption capacity of activated carbon for carbon dioxide, allowing for direct air capture and reducing energy requirements for regeneration, thereby improving the overall efficiency and cost-effectiveness of carbon capture.

Implementation Method 1

capturing carbon dioxide from a gas mixture through physisorption by applying electrical charges to a sorbent to increase the sorbent's selectivity and adsorption

Methodology Applied

Scientific EffectPhysisorption: Physisorption

Implementation Method 2

liberating the carbon dioxide from the sorbent by removing the charges from the sorbent and applying a desorption method to the sorbent

Methodology Applied

Scientific EffectDesorption: Desorption

Data Source

PatentUS12303820B2Voltage-swing method for carbon capture using porous carbons

Publication Date: 2025.05.20 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A method and system for carbon capture through a voltage-swing is provided. The present invention may include capturing carbon dioxide from a gas mixture through physisorption by applying a positive electrical charge to a sorbent to increase the sorbent's selectivity and adsorption and liberating the carbon dioxide from the sorbent by removing the positive electrical charge from the sorbent and applying a desorption method to the sorbent.