Transparent Quartz Gas Diffusion Layer for Photoelectrode Transport
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Solution Overview
Problem
Gas diffusion layers used in electrochemical applications are non-transparent, limiting their use in photo-electrochemical applications and causing mass transport limitations and charge recombination issues, while being expensive due to the use of precious metals like Au and Pt.
Innovation Solution
A method to create a gas diffusion layer using processed quartz wool with entangled fibers coated with conductive materials like tin oxide or zinc oxide, which is transparent and has a high surface area, allowing for improved light transmission and oxidation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional carbon-based or metallic porous GDLs are used, then electrical conductivity and gas flow are improved, but transparency is lost preventing photo-electrochemical applications
Solution Approach 1:
The patent uses composite materials by coating transparent porous quartz substrate with transparent conductive oxide materials (such as ITO, FTO, ZnO). This composite structure combines the transparency of quartz with the electrical conductivity of conductive oxides, resolving the contradiction between light transmission and electrical conductivity for photo-electrochemical applications
Solution Approach 2:
The patent employs porous quartz felt as the substrate material, which maintains high porosity (>1 micrometer pore sizes) for gas flow while being intrinsically transparent. This porous transparent structure allows both light transmission and gas diffusion, overcoming the limitation of traditional non-transparent GDLs
2Illumination intensity
If monolithic conductive substrates are used to enable tandem photoelectrode configurations, then transparency is improved, but mass transport limitations and charge recombination increase
Solution Approach 1:
The patent uses porous quartz felt with pore sizes >1 micrometer that allows efficient gas flow and mass transport while maintaining transparency. The porous structure provides three-dimensional pathways for gas diffusion, eliminating the mass transport limitations associated with flat monolithic substrates
Solution Approach 2:
The patent transitions from two-dimensional monolithic substrates to three-dimensional porous structures. The porous quartz felt provides multi-dimensional gas flow pathways and increased surface area, improving mass transport efficiency while maintaining light transmission for tandem configurations
3Area of stationary object
If multiple layers of photo-absorbing material are deposited on monolithic substrates to increase surface area, then light absorption is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses porous quartz felt that inherently provides high surface area through its three-dimensional porous network. This eliminates the need to deposit multiple layers of photo-absorbing material, as the porous substrate itself offers sufficient surface area for catalyst deposition while simplifying the manufacturing process
4Reliability
If Au-coated or Pt-coated porous titanium is used to improve GDL stability at high oxidative conditions, then oxidation resistance is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive precious metals (Au, Pt) with cheaper alternative materials such as conductive oxides (ITO, FTO, ZnO) coated on porous quartz. While the service life may be limited, the significant cost reduction makes this economically viable for large-scale photo-electrochemical applications
Solution Approach 2:
The patent uses composite materials combining porous quartz substrate with conductive oxide coatings, providing both oxidation resistance and electrical conductivity at a fraction of the cost of precious metal coatings. This composite approach maintains reliability while dramatically reducing material costs
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 provides a gas diffusion layer with high surface area and good resistivity, enabling efficient light transmission and improved stability under oxidative conditions, reducing costs by using abundant materials instead of precious metals.
Implementation Method 1
annealing the cake of the entangled quartz fibres without complete melting of the entangled quartz fibres to obtain a porous quartz felt having pore size greater than 1 μm
Implementation Method 2
annealing the cake of the entangled quartz fibres without complete melting of the entangled quartz fibres
Implementation Method 3
coating the porous quartz felt with a conductive material
Data Source
AI summary
Method for making a gas diffusion layer for an electrode, the method including processing quartz wool with water in a blender to form a suspension, filtering the suspension to remove water and contaminants, to form a cake of entangled quartz fibres, annealing the cake of entangled quartz fibres without complete melting of the fibres to obtain a porous quartz felt having pore size greater than 1 μm and coating the porous quartz felt with a conductive material. Gas diffusion layer for an electrode and photoelectrode including the gas diffusion layer.