Microporous Layer Composition for Low-Resistance Water Electrolysis Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ti fiber sintered bodies used in water electrolysis cells cause deformation and deterioration of the catalyst layer and solid polymer electrolyte membrane due to their large unevenness, leading to increased electrical resistance and decreased performance when a microporous layer is employed.
Innovation Solution
A water electrolysis cell with a microporous layer containing a carrier made of oxides like Ti, Mn, Co, Mo, Ru, W, Nb, and Ta, and a conductive material supported on the carrier, with a thickness of 20 μm to 100 μm and a conductive material content of 50% by mass, to maintain conductivity and prevent membrane deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microporous layer is formed between the gas diffusion layer and the catalyst layer to suppress deformation, then the deformation of the catalyst layer and solid polymer electrolyte membrane is suppressed, but the electric resistance of the water electrolysis cell is increased and performance is deteriorated
Solution Approach 1:
The microporous layer is constructed as a composite material combining conductive oxide particles (such as RuO2, IrO2, Pt, or their combinations) with a porous substrate. This composite structure provides both the mechanical function of suppressing membrane deformation and the electrical function of maintaining low resistance, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The invention changes the material parameters of the microporous layer by using conductive oxides with specific electrical conductivity properties. The conductive oxide particles are selected to have high electrical conductivity, which fundamentally changes the electrical parameter of the microporous layer from insulating to conductive, thereby reducing electric resistance while maintaining the deformation suppression function.
2Productivity
If a Ti fiber sintered body is used for the gas diffusion layer, then the gas diffusion performance is maintained, but the large unevenness causes local crushing of the catalyst layer and thinning of the solid polymer electrolyte membrane, decreasing durability
Solution Approach 1:
The microporous layer acts as an intermediary layer between the Ti fiber sintered body (gas diffusion layer) and the catalyst layer/solid polymer electrolyte membrane. This intermediate layer absorbs and distributes the mechanical stress and unevenness from the Ti fibers, preventing direct contact and crushing of the membrane and catalyst layer, thereby improving durability while maintaining gas diffusion performance through the Ti fiber structure.
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 solution suppresses performance deterioration by maintaining conductivity and preventing membrane deformation, thus enhancing the overall performance of the water electrolysis cell.
Implementation Method 1
a conductive material supported on the carrier
Implementation Method 2
a water electrolysis cell used for water electrolysis
Data Source
AI summary
Provided is a water electrolysis cell capable of suppressing a deterioration in performance even when a microporous layer is provided. A water electrolysis cell includes a solid polymer electrolyte membrane, a catalyst layer, a microporous layer, and a gas diffusion layer. The microporous layer includes a carrier made of an oxide containing at least one element selected from Ti, Mn, Co, Mo, Ru, W, Nb, and Ta, and a conductive material supported on the carrier.