Micro-Structured Gas Diffusion Electrode for Stable Three-Phase Boundaries

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Solution Overview

Problem

Existing gas diffusion electrodes suffer from complete moistening of the electron conducting layer by liquid electrolyte, preventing the formation of a stable three-phase boundary.

Innovation Solution

A gas diffusion electrode with a hydrophilic micro-structured electron conducting layer and a hydrophobic membrane, ensuring a reliable three-phase boundary formation by preventing complete electrolyte coverage, while maintaining high conductivity and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If expensive catalyst materials are used to ensure reaction efficiency, then electrochemical performance is improved, but manufacturing cost increases

Engineering Contradiction:
Improveelectrochemical performanceVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

Catalyst material is selectively deposited only in the hydrophilic valleys of the micro-structured surface where three-phase boundaries form, rather than coating the entire surface. This localized catalyst placement concentrates catalytic activity at the reactive interfaces while minimizing expensive material usage.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The micro-structured geometry self-organizes the electrolyte and gas phases to automatically form three-phase boundaries at the hydrophilic regions, which then naturally attract and concentrate catalyst material. The structure itself guides the positioning of catalytic sites without requiring external patterning or alignment processes.

Inventive Principle:
Principle #25Self-service

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 solution enhances the reliability and operational life of the electrode by ensuring consistent three-phase boundary formation and reducing the need for expensive catalyst materials.

Implementation Method 1

the first side being provided with a micro-structuring... having a hydrophilic character

Methodology Applied
Scientific EffectHydrophilicity: Hydrophile

Implementation Method 2

a hydrophobic membrane is provided... ensuring a reliable three-phase boundary formation by preventing complete electrolyte coverage

Methodology Applied
Scientific EffectHydrophobicity: Hydrophobe

Data Source

PatentUS12424637B2Gas diffusion electrode and use thereof
Publication Date: 2025.09.23 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
  • US12424637B2 patent drawing
  • US12424637B2 patent drawing
  • US12424637B2 patent drawing

AI summary

A gas diffusion electrode may be provided comprising an electron conducting layer with a first side and an opposite second side, wherein the first side is provided with a microstructuring, wherein the gas diffusion electrode additionally has a hydrophobic membrane with a first side and an opposite second side, wherein the second side of the membrane is arranged on the first side of the electron conducting layer. A battery or an accumulator or an electrolyser or a galvanic cell may be provided with a gas diffusion electrode of this type.