Cathode Mass Transfer via Thiol Masking and Electrochemical Removal
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Solution Overview
Problem
Current polymer electrolyte membrane fuel cells face challenges in improving oxygen transfer efficiency due to sulfone groups of the ionomer confining to the metal catalyst surface, which restricts the formation of an ionomer coating film, thereby limiting the transfer of both oxygen and hydrogen ions, especially at high current densities.
Innovation Solution
A method involving coating a metal-supported catalyst with an alkane compound having a hydrophobic thiol group, mixing it with a polymer electrolyte and solvent to form a slurry, and applying a voltage using cyclic voltammetry to remove the thiol group, thereby preventing ionomer film formation and enhancing oxygen and hydrogen ion transfer capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If platinum catalyst amount is reduced to lower cost, then manufacturing cost is reduced, but oxygen transfer efficiency deteriorates
Solution Approach 1:
The patent changes the surface properties of catalyst particles by applying ionomer coating selectively, which modifies the local environment and enhances oxygen transfer efficiency. This parameter change allows maintaining high efficiency with reduced platinum loading by optimizing the distribution and surface characteristics of the remaining catalyst particles.
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 improves oxygen transfer efficiency and current density by preventing ionomer film formation on the catalyst surface, allowing for spatial dualization of transfer routes and increased electrochemically active surface area, resulting in enhanced fuel cell performance at high current densities.
Implementation Method 1
mixing a metal-supported catalyst with an alkane compound having a thiol group to mask a surface of the metal-supported catalyst with the alkane compound having the thiol group by coating
Implementation Method 2
applying a voltage acceptable within the fuel cell thereto using cyclic voltammetry to remove the thiol group
Data Source
AI summary
A method of manufacturing a cathode with improved mass transfer capability includes (a) mixing a metal-supported catalyst with an alkane compound having a thiol group and masking a surface of the metal-supported catalyst with the alkane compound having the thiol group by coating; (b) mixing the metal-supported catalyst masked with the alkane compound having the thiol group, with a polymer electrolyte and a solvent to produce a slurry and manufacturing the cathode using the slurry; and (c) producing a membrane electrode assembly (MEA) using the cathode, an electrolyte membrane and an anode and applying a voltage to the membrane electrode assembly to remove the alkane compound having the thiol group.