Electrocatalyst Liquid Mediator Proton Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increase in catalytic metal particle size to enhance efficiency in polymer electrolyte fuel cells results in a decreased specific surface area, degrading power generating performance per catalytic metal weight, necessitating higher noble metal catalyst amounts to maintain performance.
Innovation Solution
An electrocatalyst with a solid proton-conductive material and a liquid conductive material retaining part that minimizes direct contact between the catalyst and the solid proton-conductive material, using a liquid proton-conductive material like water to form proton transport paths, maintaining the active area and reducing catalyst usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the average particle size of catalytic metal is increased to be larger than the average pore size of fine pores of conductive carrier, then the efficiency of utilizing catalytic metal is enhanced and the amount of unused catalytic metal is decreased, but the specific surface area is decreased and the power generating performance per catalytic metal weight is degraded
Solution Approach 1:
The patent introduces a liquid conductive material retaining part as an intermediary between the catalyst and the solid proton-conductive material. This liquid medium (containing water or other liquid proton-conductive materials) acts as a mediator that enables proton transport to the catalyst surface without requiring direct contact between the solid electrolyte and the catalyst particles, thereby maintaining high specific surface area while ensuring efficient proton supply.
Solution Approach 2:
The patent changes the physical state of the proton-conductive material from solid-only contact to liquid-mediated contact. By introducing a liquid conductive material retaining part that holds liquid proton-conductive materials, the system transitions from direct solid-solid contact to liquid-mediated proton transport, which allows catalyst particles to maintain their high surface area while still receiving protons efficiently.
2Reliability
If a solid proton-conductive material makes direct contact with a catalyst surface, then the efficiency of utilizing the catalyst is improved, but the active area of the catalyst surface is decreased due to adsorption of the solid proton-conductive material
Solution Approach 1:
The liquid conductive material retaining part serves as an intermediary layer between the solid proton-conductive material and the catalyst surface. This liquid medium contains liquid proton-conductive materials (such as water) that facilitate proton transport to the catalyst without the solid proton-conductive material needing to directly contact and adsorb onto the catalyst surface, thereby preserving the catalyst's active surface area.
Solution Approach 2:
The patent employs a liquid-based proton conduction mechanism (hydraulic approach) instead of direct solid contact. The liquid conductive material retaining part utilizes liquid proton-conductive materials to transport protons to the catalyst surface, replacing the need for solid-solid contact and preventing adsorption-related surface area loss.
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
This approach enhances catalyst efficiency while reducing the amount of expensive noble metal catalysts required, maintaining power generating performance by suppressing direct contact and forming effective proton transport paths.
Implementation Method 1
a liquid conductive material retaining part that retains a liquid proton-conductive material connecting the catalyst to the solid proton-conductive material in a proton-conductive manner
Implementation Method 2
when a solid proton-conductive material (electrolyte polymer), which readily adsorb to a catalyst surface compared to reactive substances such as oxygen, makes contact with a catalyst surface
Data Source
Figure 1
Figure 2~3
AI summary
Provided is an electrocatalyst for solid polymer fuel cells capable of increasing the active surface area for reactions in a catalyst component, increasing the utilization efficiency of the catalyst, and reducing the amount of expensive precious metal catalyst used. Also provided are a membrane electrode assembly that uses this electrocatalyst and a solid polymer fuel cell. An electrocatalyst (1) for a solid polymer fuel cell is provided with a catalyst (2) and solid proton conducting material (3). A liquid conductive material retention part (4a) that retains a liquid proton conducting material that connects the catalyst (2) and solid proton conducting material (3) is provided between the same. The surface area of the catalyst (2) exposed within the liquid conductive material retention part (4a) is larger than the surface area of the catalyst (2) in contact with the solid proton conducting material (3).