Perovskite Hydrogen Permeable Material for Low-Temperature Flux
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Solution Overview
Problem
Cermet materials used for hydrogen permeation exhibit high-flux performance only at temperatures above 700°C due to large bonding energy between lattice oxygen and protons, making it difficult to achieve sufficient hydrogen permeability at temperatures below 600°C, especially in water vapor-containing atmospheres.
Innovation Solution
A hydrogen permeable material comprising a perovskite-type compound represented by specific general formulas, including M1-xZr1-yInyO3-x-0.5y, where M is an alkaline earth metal, and In can have valences of +1, +2, or +3, with a hydrate form that introduces hydride ions, allowing for hydrogen permeability at temperatures of 600°C or less and in water vapor-containing environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cermet materials are used for hydrogen permeation, then high-flux performance is achieved, but only at temperatures above 700°C due to large bonding energy between lattice oxygen and protons
Solution Approach 1:
The patent changes the chemical bonding parameters of the perovskite material by substituting Zr with In elements, which modifies the lattice structure and reduces the bonding energy between oxygen and protons. This allows hydrogen permeation to occur at lower temperatures (600°C or less) while maintaining high flux performance, resolving the contradiction between achieving high productivity and reducing operating temperature.
Solution Approach 2:
The patent creates a composite perovskite material with specific composition (M1-xZr1-yInyO3-x-0.5y) combining multiple elements to achieve optimal properties. The composite structure provides both the necessary chemical stability and reduced oxygen-proton bonding energy, enabling high hydrogen flux at lower temperatures without compromising material integrity.
2Reliability
If cermet materials are used for hydrogen permeation, then sufficient hydrogen permeability is achieved, but difficult in the temperature range of 600°C or less, especially in water vapor-containing atmospheres
Solution Approach 1:
The patent introduces local quality changes by creating oxygen vacancies and modifying the local chemical environment around protons in the perovskite lattice. The specific substitution of Zr with In creates localized regions with reduced bonding energy, enabling reliable hydrogen permeation at 600°C or less even in challenging water vapor-containing atmospheres.
3Reliability
If perovskite type compound with In substitution is used, then hydrogen permeability is improved at low temperature, but structural stability must be maintained
Solution Approach 1:
The patent carefully controls the substitution parameters (x, y values in the formula M1-xZr1-yInyO3-x-0.5y) to achieve optimal balance between hydrogen permeability and structural stability. By adjusting the In substitution level and creating controlled oxygen vacancies, the material maintains perovskite structure stability while enabling low-temperature hydrogen permeation.
Solution Approach 2:
The patent designs a composite perovskite material where multiple elements work synergistically to maintain structural stability. The combination of M (alkaline earth metal), Zr, and In in specific proportions creates a stable composite structure that resists degradation while providing the necessary low bonding energy for hydrogen permeation at 600°C or less.
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 perovskite-type hydrogen permeable material achieves excellent hydrogen permeability at temperatures as low as 600°C and in water vapor-containing atmospheres, enabling efficient hydrogen transport and fuel cell operation within these conditions.
Implementation Method 1
cermet materials which is imparted proton-electron (H+-e−) mixed conductivity by combining proton-conductive oxides
Implementation Method 2
A material that selectively permeates hydrogen (hydrogen permeable material) is useful not only as a separation membrane for hydrogen generation
Implementation Method 3
with a hydrate form that introduces hydride ions, allowing for hydrogen permeability at temperatures of 600°C or less
Implementation Method 4
since the bonding energy between lattice oxygen-protons in the ceramic solid is 50 kJ/mol and very large
Data Source
AI summary
An object of the present invention is to provide a hydrogen permeable material having excellent hydrogen permeability. Another object of the present invention is to provide a composite member and a fuel cell including the hydrogen permeable material. The hydrogen permeable material comprises a perovskite type compound represented by the following general formula (1a). In another embodiment, the hydrogen permeable material comprises a hydrogen-containing perovskite type compound, which is the perovskite type compound represented by the general formula (1a) with introduced hydride ion (H−). Wherein M is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca, x is a numerical value of 0 or more and 0.3 or less, y is a numerical value of more than 0 and 0.75 or less, w is a value at which an average valence of In is +1.0 or more and +2.5 or less, and y≥w.M1-xZr1-yInyO3-x-0.5y-2 (1a)