Dual Membrane Hydrogen Purification for Low-Complexity High Purity
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Solution Overview
Problem
Existing methods for purifying hydrogen gas are inefficient, costly, and fail to achieve high purity due to the small size of hydrogen molecules and flammability, leading to impurity diffusion and increased system complexity.
Innovation Solution
A dual membrane electrode assembly (DMEA) system that uses two MEAs with catalysts to oxidize and reduce hydrogen ions, enhancing purity by reducing impurity content through multiple stages without external handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple individual electrochemical hydrogen pumps are used in series to increase hydrogen gas purity, then hydrogen gas purity is improved, but system complexity and costs increase due to multiple separate hardware components and control systems
Solution Approach 1:
The patent combines multiple electrochemical pump functions into a single integrated cell stack where multiple membrane electrode assemblies (MEAs) are stacked together and electrically connected in series. This merging approach maintains the purification effectiveness of multiple stages while eliminating the need for multiple separate pumps, housings, and control systems, thereby reducing overall system complexity and cost.
Solution Approach 2:
The single cell stack design serves multiple functions simultaneously: it acts as both the housing structure and the functional purification unit, integrates electrical connections for multiple MEAs within a unified framework, and provides both compression and purification functions in one device, thereby reducing the need for separate specialized components.
2Manufacturing precision
If membrane thickness is increased in the electrochemical cell to decrease impurity diffusion, then hydrogen gas purity is improved, but energy consumption increases and hydrogen recovery rate decreases
Solution Approach 1:
Instead of using a single thick membrane that would increase energy consumption and reduce hydrogen recovery, the patent segments the purification function into multiple thinner membrane electrode assemblies stacked in series. Each MEA uses a thin membrane that allows efficient hydrogen transport, while the series configuration of multiple MEAs achieves the cumulative purification effect equivalent to a much thicker single membrane, thereby maintaining low energy consumption and high hydrogen recovery rate.
3Manufacturing precision
If multiple separate electrochemical pump cell stacks are used to purify hydrogen gas twice, then hydrogen gas purity is improved, but system complexity and costs increase due to multiple sets of electrochemical stack hardware
Solution Approach 1:
The patent merges multiple cell stack functions into a single integrated cell stack design where multiple MEAs are stacked and electrically connected in series within one unified structure. This eliminates the need for multiple separate cell stacks and their associated hardware (housings, balance-of-plant components, control systems), thereby significantly reducing manufacturing costs while achieving the required purification levels.
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
Achieves hydrogen gas purity up to 100 times lower impurity content, with impurities reduced to at most 100 ppm, meeting semiconductor industry standards efficiently.
Implementation Method 1
the anode containing a catalyst adapted to oxidize the hydrogen gas to produce hydrogen ions and electrons
Implementation Method 2
a proton-exchange membrane positioned and adapted to receive and transfer the hydrogen ions produced by the anode
Implementation Method 3
the cathode containing a catalyst adapted to reduce the hydrogen ions transferred through the proton-exchange membrane to produce a second gas stream having a second hydrogen gas content greater than the first hydrogen gas content
Data Source
AI summary
Hydrogen gas purifier electrochemical cells, systems for purifying hydrogen gas, and methods for purifying hydrogen gas are provided. The cells, systems, and methods employ double membrane electrode (DMEA) electrochemical cells that enhance purification while avoiding the complexity and cost of conventional cells. The purity of the hydrogen gas produced by the cells, systems, and methods can be enhanced by removing at least some intermediate gas impurities from the cells. The purity of the hydrogen gas produced by the cells, systems, and methods can also be enhanced be introducing hydrogen gas to the cells to replenish any lost hydrogen. Water electrolyzing electrochemical cells and methods of electrolyzing water to produce hydrogen gas are also disclosed.