Porous Electrode Phase Inversion for Water Electrolysis
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Solution Overview
Problem
Existing porous electrodes for water electrolysis are brittle, have limited catalytic activity, and poor adhesion of catalyst layers, leading to limited stability and durability.
Innovation Solution
A method for producing a porous electrode comprising a porous matrix with a polymeric binder material and electrochemically active particles, achieved by preparing a slurry, applying it to a conductive support, and inducing phase inversion to form a porous structure with improved stability and electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional porous electrodes are used, then manufacturing is simple, but catalytic activity is limited and durability is poor
Solution Approach 1:
The patent uses a composite structure consisting of a porous support combined with a porous composite layer containing electrochemically active particles dispersed in a polymeric binder matrix. This composite approach enhances catalytic activity and durability while maintaining manufacturability through slurry preparation and phase inversion processing.
Solution Approach 2:
The patent employs porous materials throughout the electrode structure, including a porous support and a porous composite layer with controlled porosity. The porous structure facilitates mass transport and ionic diffusion while providing high surface area for electrochemical reactions, resolving the contradiction between performance and manufacturing complexity.
2Reliability
If catalyst layers are added to porous electrodes, then catalytic activity improves, but adhesion is poor and stability decreases
Solution Approach 1:
The patent merges the catalyst layer and binder into a single integrated porous composite layer that is formed together with the support structure. The electrochemically active particles are dispersed within the polymeric binder matrix, creating a unified structure with improved adhesion and stability, eliminating the separate catalyst layer application step.
Solution Approach 2:
The polymeric binder material serves as an intermediary that disperses and anchors the electrochemically active particles within the porous structure. This binder matrix provides strong adhesion to the support while maintaining porosity for mass transport, resolving the adhesion problem without adding structural complexity.
3Productivity
If porosity is increased to improve mass transport, then ionic diffusion improves, but mechanical strength decreases
Solution Approach 1:
The patent utilizes porous materials with optimized pore structure that balance mass transport and mechanical strength. The porous support and porous composite layer are designed with controlled porosity to facilitate ionic diffusion and mass transport while the polymeric binder matrix provides structural integrity, resolving the contradiction between porosity and strength.
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 resulting porous electrodes exhibit enhanced stability, durability, and electrochemical performance, with improved mass transport and ionic diffusion, leading to increased efficiency in water electrolysis.
Implementation Method 1
subjecting the slurry of the coated support to phase inversion, thereby obtaining the porous electrode
Implementation Method 2
improved mass transport and ionic diffusion
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5
AI summary
The present invention is related to a method of producing a porous electrode comprising: preparing a slurry comprising a solvent, between 1 % and 25 % by weight of a polymeric binder material and between 10 % and 80 % by weight of particles comprising an electrochemically active material, based on the total weight of the slurry, the polymeric binder material being at least partially dissolved in the solvent; applying the slurry to a porous electrically conductive support; and subjecting the slurry of the coated support comprising the slurry to phase inversion, thereby forming the porous electrode, which comprises the porous electrically conductive support and a porous composite comprising a porous matrix, comprising the polymeric binder material, and the particles comprising the electrochemically active material, wherein the particles are dispersed in the porous matrix, wherein the weight ratio of the polymeric binder material to the particles in the slurry is between 2:98 and 50:50, and wherein a total amount of the polymeric binder material and the particles in the slurry is between 32 % and 80 % by weight, based on the total weight of the slurry. The invention further relates to a porous electrode comprising a porous electrically conductive support and a porous composite comprising a porous matrix, comprising a polymeric binder material, and particles comprising an electrochemically active material.