Porous Electrodes in Cation Exchange Modules

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Solution Overview

Problem

Existing electrochemical systems for acidification and gas production from seawater are limited by high capital costs, weight, and footprint due to the need for multiple closing mechanisms and endplates for each electrochemical unit, which also restricts the flow rate and efficiency of the process.

Innovation Solution

The use of porous electrodes, such as mesh electrodes, and cation exchange membranes in an electrochemical system with multiple units stacked between endplates, allowing for shared anode and cathode compartments and inert porous screens to support membranes, reduces the number of endplates and tie-rods required, enhancing flow rate and reducing costs while maintaining efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple closing mechanisms and endplates are used for each electrochemical unit, then structural integrity and separation are maintained, but capital costs, weight, and footprint increase

Engineering Contradiction:

Improvestructural integrityVSAvoidsystem weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

Adjacent electrochemical units share common endplates and closing mechanisms. The endplate of one unit serves as a structural component for the adjacent unit, consolidating the number of endplates required and reducing overall system weight while maintaining structural integrity through shared load-bearing components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Endplates are designed to perform multiple functions: they provide structural closure for adjacent units, serve as mounting surfaces for electrical connections, and act as support structures for flow distributors. This multi-functionality reduces the need for additional specialized components, lowering overall system weight.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If multiple closing mechanisms and endplates are used for each electrochemical unit, then structural integrity and separation are maintained, but capital costs and footprint increase

Engineering Contradiction:

Improvestructural integrityVSAvoidsystem footprint

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

Adjacent electrochemical units share common endplates and closing mechanisms. The endplate of one unit serves as a structural component for the adjacent unit, consolidating the number of endplates required and reducing overall system footprint while maintaining structural integrity through shared load-bearing components.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If traditional electrode structures are used, then electrical conductivity is maintained, but flow rate and efficiency are restricted

Engineering Contradiction:

Improveelectrical conductivityVSAvoidflow rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent employs porous electrodes with controlled porosity that allows simultaneous electrical conductivity and fluid penetration. The porous structure provides conductive pathways for electrons while allowing electrolyte flow through the electrode matrix, enhancing mass transport and reaction efficiency without sacrificing electrical conductivity.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The electrode structure features localized variations in porosity and conductivity. Regions closer to the membrane interface have optimized porosity for ion transport, while outer regions maintain higher conductivity for electron transport. This spatial differentiation of properties optimizes both flow rate and electrical performance.

Inventive Principle:

Principle #3Local quality

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 configuration increases the flow rate through the system, reduces capital costs, weight, and footprint, while maintaining or improving the efficiency of acidification and gas production, specifically converting bicarbonate ions to CO2 and producing hydrogen gas, with a 20% reduction in energy requirements compared to traditional designs.

Implementation Method 1

a porous anode disposed in an anode compartment, a porous cathode disposed in a cathode compartment, and a center compartment disposed between and separated from the anode compartment and the cathode compartment by cation exchange membranes

Methodology Applied

Scientific EffectCation exchange: Ion Exchange

Implementation Method 2

Electrochemical devices that perform processes based on chemical reactions at electrodes are widely used in industrial and municipal implementations

Methodology Applied

Scientific EffectElectrochemical reaction: Electrolysis

Data Source

PatentUS20250100909A1Use of mesh electrodes in electrolytic - cation exchange modules

Publication Date: 2025.03.27 EVOQUA WATER TECHNOLOGIES LLC

AI summary

An electrochemical system includes first and second endplates and a plurality of electrochemical units disposed between the first and second endplates. Each of the plurality of electrochemical units includes a porous anode disposed in an anode compartment, a porous cathode disposed in a cathode compartment, and a center compartment disposed between and separated from the anode compartment and the cathode compartment by cation exchange membranes.