Electrocatalyst Ink Chelation for Base Metal Contaminant Removal

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Solution Overview

Problem

The performance of membrane electrode assemblies in fuel cells is compromised by base metal contaminants that enter the electrocatalyst layer during preparation, leading to lower than expected electrochemical performance.

Innovation Solution

A method of preparing an electrocatalyst ink by dispersing an electrocatalyst material, an ion-conducting material, and a diluent, and then contacting the dispersion with a base metal-binding agent to remove contaminants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If base metal-containing electrocatalyst materials are used, then cost is reduced and activity is enhanced, but base metal contaminants leach during preparation causing lower electrochemical performance

Engineering Contradiction:

Improveelectrochemical performanceVSAvoidbase metal contaminants

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes base metal contaminants from the electrocatalyst ink preparation process by introducing a base metal-binding agent that selectively binds and removes base metal ions, separating the harmful contaminants from the beneficial base metal-containing electrocatalyst material

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a base metal-binding agent as an intermediary substance that mediates between the base metal-containing electrocatalyst material and the final electrocatalyst layer, selectively binding base metal contaminants while allowing the electrocatalyst material to proceed with the preparation process

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If base metal-binding agent is added to remove contaminants, then electrochemical performance is improved, but ink formulation complexity increases

Engineering Contradiction:

Improveelectrochemical performanceVSAvoidink formulation

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies the chemical parameters of the ink formulation by adding a base metal-binding agent with specific binding properties, changing the chemical environment to selectively remove base metal contaminants while maintaining compatibility with other ink components

Inventive Principle:

Principle #35Parameter changes

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 method results in improved electrochemical performance of membrane electrode assemblies by effectively removing base metal contaminants, leading to enhanced fuel cell performance.

Implementation Method 1

contacting the dispersion with a base metal-binding agent

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

contacting the dispersion with a base metal-binding agent to remove contaminants

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Data Source

PatentUS12288885B2Electrocatalyst ink

Publication Date: 2025.04.29 JOHNSON MATTHEY HYDROGEN TECH LTD

AI summary

The present invention provides a method of preparing an electrocatalyst ink, the method comprising a step of contacting a dispersion with a base metal-binding agent.