Ionic Conductive Membrane Water Vapor Pressure Optimization
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Solution Overview
Problem
Current hydrogen production methods, such as hydrocarbon synthesis and thermochemical conversion, face challenges like high energy requirements, greenhouse gas emissions, and corrosion issues, limiting their scalability and efficiency for industrial hydrogen production.
Innovation Solution
A method optimizing the conductivity of ionic conductive membranes by inserting water vapor under pressure, allowing for increased ionic conductivity at lower temperatures, using materials like non-stoichiometric and doped perovskites that adsorb and absorb water vapor, thereby enhancing proton and hydroxide ion mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature (3000-4000°K) is used for direct thermal decomposition of water, then hydrogen production efficiency is improved, but energy consumption and equipment requirements become unrealistic
Solution Approach 1:
The patent changes the operating temperature parameter from unrealistic 3000-4000°K to achievable temperatures below 1000°C by introducing a catalytic mechanism. This parameter transformation makes the process industrially viable while maintaining high hydrogen production efficiency through the synergistic effect of moderate temperature and catalyst assistance.
Solution Approach 2:
The patent introduces sulfur, iodine, or bromine as intermediary catalysts that facilitate water decomposition at lower temperatures. These intermediaries act as mediators between the thermal energy and the water molecules, enabling the breakdown reaction to proceed efficiently at temperatures below 1000°C rather than requiring extreme temperatures.
2Use of energy by stationary object
If sulfur, iodine or brominated catalysts are used to lower decomposition temperature to 850°C, then energy consumption is reduced, but severe corrosion problems occur
Solution Approach 1:
The patent employs sacrificial protective layers made of reactive materials that corrode preferentially to protect the underlying equipment. These disposable protective layers are designed to be replaced periodically, absorbing the corrosive attack while preserving the main system components and maintaining low energy consumption benefits.
Solution Approach 2:
The patent converts the harmful corrosive effect into a beneficial protective mechanism by using controlled corrosion of sacrificial materials. The corrosion products form protective barriers or are managed to prevent damage to critical components, transforming the originally harmful corrosion into a protective feature that enables continued operation at low temperatures.
3Productivity
If conventional hydrogen synthesis from hydrocarbons is used, then hydrogen production is achieved, but significant quantities of CO2 greenhouse gases are generated
Solution Approach 1:
The patent extracts and removes carbon from the hydrogen production process entirely by using water as the sole hydrogen source. Through catalytic decomposition of water, hydrogen is produced directly without generating CO2, effectively taking out the carbon emission pathway from the synthesis process and achieving clean hydrogen production.
Solution Approach 2:
The patent creates an inert, carbon-free chemical environment by using water decomposition instead of hydrocarbon reforming. This inert approach eliminates carbon-containing reactants and products from the system, preventing greenhouse gas generation while maintaining efficient hydrogen production through the water-hydrogen conversion pathway.
4Reliability
If ionic conductive membranes operate at high temperature, then ionic conductivity is improved, but energy consumption increases
Solution Approach 1:
The patent introduces water vapor as an intermediary that enhances ionic conductivity in the membrane at lower temperatures. The water vapor interacts with the membrane material to create additional conduction pathways or activate ionic sites, enabling high conductivity without requiring high thermal energy input that would otherwise be necessary.
Solution Approach 2:
The patent changes the operational parameters by introducing water vapor pressure as a controlling variable instead of relying solely on temperature. By adjusting water vapor pressure and composition, the membrane achieves optimal ionic conductivity at reduced temperatures, transforming the temperature-conductivity relationship into a pressure-conductivity relationship that consumes less energy.
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
This approach enables efficient hydrogen production with reduced energy consumption, lower operating temperatures, and minimized greenhouse gas emissions, while avoiding corrosion issues, thus making hydrogen production more cost-effective and sustainable.
Implementation Method 1
By material allowing the insertion of water vapor into said membrane, we mean a material capable of ensuring the adsorption and/or absorption of water vapor in the membrane
Implementation Method 2
By material allowing the insertion of water vapor into said membrane, we mean a material capable of ensuring the adsorption and/or absorption of water vapor in the membrane
Implementation Method 3
Thanks to the invention, water vapor under pressure is forced into the membrane and this pressure is advantageously used to obtain the desired conductivity at a given temperature
Implementation Method 4
A potential difference is applied between the anode 12 and the cathode 13. The water vapor H2O is electrolyzed along the electrolyte 11 on the side of the anode 12
Implementation Method 5
proton-conducting ceramic membrane 11 providing the electrolyte function
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a method for optimising the conductivity provided by the displacement of H+ protons and /or OH- ions in a conductive membrane made of a material permitting the insertion of steam into said membrane, wherein said method comprises the step of inserting under pressure gaseous flow containing the steam into said membrane in order to force said steam into said membrane under a certain partial pressure so as to obtained the desired conductivity at a given temperature, said partial pressure being higher than or equal to 1 bar, a drop in the operational temperature being compensated by an increase in said partial pressure in order to obtain the same desired conductivity. The invention can be used in particularly interesting applications in the fields of high-temperature water electrolysis for producing hydrogen, of the manufacture of fuel cells using hydrogen fuel, and of hydrogen separation and purification.