OER Catalyst Ionic Layer for Fuel Cell Electrode Protection

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Solution Overview

Problem

Fuel cells experience electrode damage and performance degradation due to oxidation during global or local fuel starvation and start/stop conditions, leading to reduced service lifetime.

Innovation Solution

Incorporating a first oxygen evolution (OER) catalyst-containing layer between the electrode and the polymer electrolyte membrane, composed of an OER catalyst, ion conducting polymer, and carbon, with a weight ratio of ion conducting polymer to carbon ranging from about 10 to 100, to enhance electrode stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional electrode structure with carbon support is used, then the fuel cell can operate efficiently during normal conditions, but the electrode carbon support undergoes oxidation during fuel starvation and start/stop conditions, leading to electrode damage and reduced service lifetime

Engineering Contradiction:

Improveelectrode stabilityVSAvoidcarbon oxidation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An ionic layer is introduced as an intermediary between the electrode and the polymer electrolyte membrane. This layer contains an oxygen evolution reaction (OER) catalyst that mediates the oxygen evolution process, preventing direct oxidation of the carbon support while maintaining fuel cell operation during fuel starvation and start/stop conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The ionic layer with OER catalyst is positioned in advance between the electrode and membrane to preemptively protect the carbon support from oxidation. The catalyst is already in place to facilitate oxygen evolution through the ionic layer before carbon oxidation can occur, preventing the harmful effect rather than remedying it afterward.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the polymer electrolyte membrane is made thin to produce electricity efficiently, then the proton transmissivity improves, but the membrane becomes more susceptible to chemical degradation and mechanical damage

Engineering Contradiction:

Improveelectricity production efficiencyVSAvoidmembrane stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention uses a thin ionic layer as a protective film between the electrode and the polymer electrolyte membrane. This thin protective layer allows the membrane to remain thin for efficient proton transport while adding a protective interface that reduces direct exposure to harmful conditions, thereby maintaining both productivity and reliability.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If an OER catalyst-containing layer is added between the electrode and polymer electrolyte membrane, then carbon corrosion is mitigated and electrode protection is improved, but the device complexity increases

Engineering Contradiction:

Improveelectrode protectionVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The ionic layer is formulated as a composite material containing an OER catalyst, ion-conducting polymer, and carbon. This composite structure integrates multiple functions (catalysis, ion conduction, and structural support) into a single layer, providing electrode protection without proportionally increasing device complexity. The composite nature allows the layer to perform multiple roles simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The ionic layer serves multiple functions: it acts as a physical barrier between the electrode and membrane, provides OER catalysis to prevent carbon oxidation, maintains ion conductivity for fuel cell operation, and offers structural support. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving comprehensive electrode protection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 OER catalyst-containing layer effectively mitigates carbon corrosion and maintains fuel cell performance across various humidity conditions, demonstrating similar protection whether the catalyst is embedded in the electrode or as a separate layer, thus extending the fuel cell's service life.

Implementation Method 1

a first oxygen evolution ('OER') catalyst-containing layer positioned between the first electrode and the polymer electrolyte membrane

Methodology Applied

Scientific EffectOxygen evolution reaction (OER): Electrolysis

Implementation Method 2

an ion conducting polymer layer positioned between the electrode and the polymeric membrane

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS9337494B2Ionic layer with oxygen evolution reaction catalyst for electrode protection

Publication Date: 2016.05.10 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A fuel cell includes a first electrode and a second electrode with an ion conducting polymer membrane positioned between these electrodes. The fuel cell further comprises a first OER catalyst-containing ionic layer positioned between the first electrode and the ion conducting polymer membrane. The first OER catalyst-containing layer includes an OER catalyst-containing compound, an ion conducting polymer and carbon. Characteristically, the weight ratio of ion conducting polymer to carbon is from about 10 to about 100. A method for forming the fuel cell is also provided.