Oxide Ion Conducting Membrane for Platinum-Free Hydrogen Production
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Solution Overview
Problem
Current methods for producing hydrogen are inefficient and costly, and there is a need for innovative technologies to develop sustainable hydrogen production systems, particularly for industrial applications such as petrochemical plants and hydrogen economy initiatives.
Innovation Solution
The use of oxide ion conducting membranes, specifically composed of lanthanum chromite and materials like doped ceria or yttria-stabilized zirconia, which are exposed to a reducing environment on both sides to electrochemically reduce steam into hydrogen, with the membrane also conducting electrons and being impermeable to fluid flow, facilitating hydrogen production in a system that does not require platinum catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydrogen production methods are used, then hydrogen can be produced, but the process is inefficient and costly
Solution Approach 1:
The patent replaces conventional thermal or electrochemical hydrogen production methods with a membrane-based separation system using oxide ion conducting membranes. The membrane selectively transports oxygen ions through its structure, enabling hydrogen separation and purification through a different physical mechanism that achieves higher efficiency and lower operational costs
Solution Approach 2:
The invention employs composite oxide ion conducting membranes combining multiple materials (such as doped ceria, YSZ, LSGM, or SSZ) to achieve optimal ionic conductivity and selectivity. These composite materials enable efficient oxygen ion transport while maintaining structural stability, thereby improving hydrogen production efficiency compared to conventional single-material systems
2Productivity
If platinum catalysts are used in hydrogen production, then catalytic activity is achieved, but the system becomes costly and complex
Solution Approach 1:
The patent extracts and eliminates the need for platinum catalysts by using oxide ion conducting membranes that inherently facilitate oxygen ion transport without requiring precious metal catalysts. The membrane's ionic conductivity provides the necessary catalytic function through its material properties rather than through surface catalysis
Solution Approach 2:
The invention replaces expensive platinum catalysts with more economical oxide-based membrane materials that can be manufactured at lower cost. While the membranes require operational stability, the substitution with non-precious metal materials significantly reduces system cost and simplifies the overall device architecture
3Ease of operation
If traditional fluid interconnects are used, then fluid flow is managed, but the system becomes operationally complex
Solution Approach 1:
The patent merges the functions of fluid interconnects and separation membranes into a single integrated oxide ion conducting membrane structure. The membrane simultaneously serves as both the separation barrier and the fluid management component, eliminating the need for separate interconnect structures and simplifying system operation
Solution Approach 2:
The oxide ion conducting membrane performs multiple functions simultaneously: it acts as a selective barrier for hydrogen separation, an ionic conductor for oxygen ion transport, and a structural component for fluid management. This multi-functionality eliminates the need for separate traditional fluid interconnects, reducing operational complexity
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 and cost-effective hydrogen production, capable of achieving high hydrogen purity and reducing operational complexity by eliminating the need for platinum catalysts and traditional fluid interconnects, thus simplifying the hydrogen production process.
Implementation Method 1
SOFCs use a solid oxide electrolyte to conduct negative oxygen ions from the cathode to the anode. The electrochemical oxidation of the oxygen ions with fuel powers electricity generation.
Implementation Method 2
exposing the oxide ion conducting membrane to a reducing environment on both sides of the membrane... steam is electrochemically reduced to hydrogen
Data Source
AI summary
Herein discussed is a method of using an oxide ion conducting membrane comprising exposing the oxide ion conducting membrane to a reducing environment on both sides of the membrane. In an embodiment, the oxide ion conducting membrane also conducts electrons. In various embodiments, the membrane is impermeable to fluid flow (e.g., having a permeability of less than 1 micro darcy). In an embodiment, the oxide ion conducting membrane comprises lanthanum chromite and a material selected from the group consisting of doped ceria, yttria-stabilized zirconia (YSZ), lanthanum strontium gallate magnesite (LSGM), scandia-stabilized zirconia (SSZ), Sc and Ce doped zirconia, and combinations thereof. In an embodiment, the lanthanum chromite comprises undoped lanthanum chromite, strontium doped lanthanum chromite, iron doped lanthanum chromite, strontium and iron doped lanthanum chromite, lanthanum calcium chromite, or combinations thereof. In an embodiment, the membrane is mixed conducting.