Electrocatalyst Ink Purification for Base Metal Contamination
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Solution Overview
Problem
Base metal contaminants, such as nickel and cobalt, leach from platinum group metal alloys during the preparation of electrocatalyst inks, leading to lower than expected electrochemical performance in membrane electrode assemblies.
Innovation Solution
A method involving a dispersion of electrocatalyst material, ion-conducting material, and diluent is prepared and contacted with a separation material containing picolinic acid ester or amide functional groups immobilized on a solid support to remove free base metal species, forming an electrocatalyst ink that improves electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrocatalyst ink is prepared using platinum group metal alloys, then catalytic activity is improved, but base metal contaminants leach into the dispersion causing performance degradation
Solution Approach 1:
The patent removes base metal contaminants from the electrocatalyst ink dispersion through filtration or centrifugation after the ink preparation process. This extraction step eliminates the harmful base metal species that leach from platinum group metal alloys, thereby resolving the contradiction between maintaining catalytic activity and preventing performance degradation from contamination.
Solution Approach 2:
The patent introduces an intermediary stabilization step where base metal contaminants are separated from the electrocatalyst ink dispersion using a filter or centrifugal separation. This intermediary process acts as a mediator between the ink preparation and application stages, preventing contaminants from reaching the membrane electrode assembly while preserving the beneficial catalytic properties of the electrocatalyst material.
2Ease of manufacture
If base metal species are present in electrocatalyst layers, then manufacturing simplicity is maintained, but electrochemical performance deteriorates
Solution Approach 1:
The patent employs a self-service approach where the electrocatalyst ink preparation process inherently includes a contamination removal step. The dispersion is automatically filtered or centrifuged to remove base metal species, making the process self-correcting without requiring additional manual intervention. This maintains ease of manufacture while ensuring high electrochemical performance through automated contaminant removal.
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 membrane electrode assemblies with improved electrochemical performance by reducing the amount of free base metal species, enhancing the efficiency of the electrocatalyst layers.
Implementation Method 1
contacting the dispersion with a separation material comprising picolinic acid ester or picolinic acid amide functional groups immobilised on a solid support
Data Source
AI summary
The present invention provides a method of preparing an electrocatalyst ink, the method comprising a step of contacting a dispersion with a separation material.