AEM Electrochemical Hydrogen Compression Without Drying
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Solution Overview
Problem
Conventional hydrogen compression methods, particularly PEM electrochemical systems, result in impure hydrogen due to moisture presence and require expensive platinum group metals, limiting widespread adoption and efficiency.
Innovation Solution
An electrochemical cell using an anion exchange membrane (AEM) system that compresses and purifies hydrogen without additional drying, utilizing a membrane electrode assembly with an AEM separating anodic and cathodic half-cells, where water is consumed at the cathode during compression, maintaining hydrogen dryness and eliminating the need for platinum group metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If PEM electrochemical compression is used to compress hydrogen, then hydrogen compression is achieved, but the hydrogen becomes moist and impure, requiring additional drying equipment
Solution Approach 1:
The patent inverts the conventional PEM approach by using an AEM system where the reaction pathway is reversed: instead of producing hydrogen at the cathode with water present (PEM), hydrogen is oxidized at the anode and water is consumed at the cathode, producing dry compressed hydrogen without requiring additional drying equipment
Solution Approach 2:
The patent changes the fundamental parameter of membrane type from PEM to AEM, which alters the electrochemical reaction pathway and water management requirements, enabling simultaneous compression and drying of hydrogen in a single step
2Power
If PEM electrochemical compression is used, then hydrogen compression is achieved, but expensive platinum group metals are required
Solution Approach 1:
The patent replaces expensive platinum group metals with cheaper alternative catalysts that are compatible with AEM technology, significantly reducing system cost while maintaining compression functionality
Solution Approach 2:
The patent changes the membrane type from PEM to AEM, which fundamentally alters the catalyst requirements and enables the use of non-precious metal catalysts, thereby reducing material costs
3Power
If conventional mechanical compression is used for hydrogen, then hydrogen compression is achieved, but high energy consumption and contamination by oils/lubricants occur
Solution Approach 1:
The patent replaces mechanical compression systems with an electrochemical AEM-based system, eliminating moving parts, oil lubricants, and associated contamination risks while reducing energy consumption through electrochemical reaction-driven compression
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 AEM system produces dry, compressed hydrogen with lower energy requirements and reduced costs, overcoming the limitations of PEM systems by avoiding the need for drying and expensive catalysts, enhancing sustainability and efficiency.
Implementation Method 1
an anion exchange membrane (AEM) therebetween
Implementation Method 2
Water is consumed at the cathode in PEM electrochemical compression systems, a fundamental difference to the reaction pathway observed in the present invention
Data Source
AI summary
An electrochemical cell, or stack thereof, wherein each cell of the stack comprises at least: a membrane electrode assembly (MEA), the MEA comprising at least: an anode, a cathode, and an an-ion exchange membrane therebetween, an inlet to the anodic half-cell for the introduction of hydrogen at a first pressure, and an outlet from the cathodic half-cell for the transfer of hydrogen at a second pressure, and means to provide a required power to the cell. In one embodiment, the purification and compression of hydrogen occurring by utilisation of the following reaction pathway: formula (A) and formula (B).