Perovskite Proton Conductor Structure to Suppress Ni Diffusion
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Solution Overview
Problem
Existing proton conductive metal oxide-based cell structures face issues with decreased proton conductivity and increased leakage current due to Ni diffusion during co-sintering, leading to reduced electrolysis efficiency in water vapor electrolysis cells.
Innovation Solution
A proton conductor with a perovskite structure represented by A x B 1-y M y O 3-δ, where A includes Ba, B includes Zr, and M includes Y, is used to form a proton-conducting cell structure with a hydrogen electrode, inhibiting Ni diffusion and maintaining high ionic transport number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solid electrolyte and electrode are separately produced and then assembled, then manufacturing flexibility is improved, but contact resistance between layers increases and manufacturing precision deteriorates
Solution Approach 1:
The patent combines the solid electrolyte layer and electrode layer into a single integrated complex that is formed in one manufacturing step. The slurry contains both solid electrolyte particles and electrode particles mixed together, which are then simultaneously sintered to create a structure where the electrode is directly formed on the solid electrolyte surface with excellent contact, eliminating the separate assembly process and associated contact resistance issues.
2Strength
If high-temperature sintering is used to improve densification, then mechanical strength is improved, but fine particle aggregation increases and manufacturing precision deteriorates
Solution Approach 1:
The patent employs a two-stage sintering process with controlled temperature parameters. First, a preliminary sintering at moderate temperature (900-1100°C) is performed to achieve basic densification while maintaining fine particle distribution. Then, a final sintering at higher temperature (1200-1400°C) is applied to achieve full densification and maximum mechanical strength. This parameter optimization prevents fine particle aggregation while ensuring complete densification.
3Device complexity
If conventional slurry preparation is used for multiple components, then manufacturing complexity is reduced, but uniformity of composition deteriorates
Solution Approach 1:
The patent applies different slurry preparation methods to different functional regions. The solid electrolyte slurry is prepared with specific viscosity control and particle size distribution optimized for electrolyte layer formation. The electrode slurry is prepared separately with different rheological properties and particle characteristics optimized for electrode formation. These region-specific slurries are then applied in sequence, ensuring uniform composition and properties in each layer while maintaining a relatively simple overall manufacturing process.
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 ensures high proton conductivity and ionic transport number, improving current efficiency in water vapor electrolysis cells and fuel cells by preventing Ni diffusion and enhancing durability.
Implementation Method 1
a) a preliminary sintering step at a temperature of 900°C to 1100°C; and b. a final sintering step at a temperature of 1200°C to 1400°C
Data Source
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AI summary
A proton conductor contains a metal oxide that has a perovskite structure and that is represented by formula (1): AxB1-yMyO3-δ, where an element A is at least one element selected from the group consisting of Ba, Ca, and Sr, an element B is at least one element selected from the group consisting of Ce and Zr, an element M is at least one element selected from the group consisting of Y, Yb, Er, Ho, Tm, Gd, In, and Sc, δ indicates an oxygen deficiency amount, and 0.95≤x≤1 and 0<y≤0.5 are satisfied.