Discontinuous Porous Electrolyser Flow Walls for Bubble-Free Separation
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Solution Overview
Problem
Existing electrolysis systems face inefficiencies due to overpotentials caused by the use of polymer electrolyte membranes and the formation of reaction product bubbles, which hinder effective ion exchange and product separation.
Innovation Solution
A flow arrangement for an electrolyser utilizing first and second porous walls with a discontinuous porous structure, allowing for elongate porous regions that inhibit flow reversal and facilitate efficient ion exchange, reducing overpotentials and enhancing electrolysis efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer electrolyte membrane (PEM) is used to separate hydrogen and oxygen, then product separation is improved, but overpotential increases due to the membrane's resistance to ion transport
Solution Approach 1:
The patent removes the PEM membrane from the electrolysis system entirely, replacing it with a membraneless cell design that uses flow field patterns and pressure differentials to achieve product separation without the resistance and overpotential losses associated with traditional membranes
Solution Approach 2:
The patent introduces a porous separator or hydrophobic layer as an intermediary structure that allows ion transport while preventing gas mixing, achieving both separation and low resistance without requiring a full PEM membrane
2Productivity
If electrodes are designed to maximize reaction surface area, then electrolysis efficiency is improved, but bubble formation on electrode surfaces increases, causing occlusion and overpotential
Solution Approach 1:
The patent employs dynamic flow field designs that create moving fluid patterns across the electrode surfaces, continuously sweeping away bubbles as they form and preventing their accumulation and occlusion of active reaction sites
Solution Approach 2:
The patent uses hydraulic flow patterns and pressure gradients to actively manage bubble removal from electrode surfaces, utilizing fluid dynamics to lift and transport bubbles away from reaction zones without requiring additional mechanical components
3Productivity
If flow channels are designed to maximize ion transport, then electrolysis efficiency is improved, but flow reversal occurs, reducing product separation effectiveness
Solution Approach 1:
The patent employs asymmetric flow field patterns where the anode and cathode channels have different geometries or flow directions, creating inherent pressure differentials that drive unidirectional flow and prevent reversal while maintaining high ion transport efficiency
Solution Approach 2:
The patent transitions from two-dimensional planar flow channels to three-dimensional flow structures with vertical components, using depth and height variations to create pressure-driven flow paths that naturally prevent reversal and enhance both ion transport and product separation
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 discontinuous porous structure in the electrolyser walls minimizes overpotentials and improves electrolysis efficiency by preventing bubble formation and ensuring effective separation of reaction products, thereby optimizing energy usage.
Implementation Method 1
first and second porous walls corresponding to first and second electrodes of the electrolyser... facilitates efficient ion exchange
Implementation Method 2
comprises a plurality of porous regions extending through the body at discrete locations to permit the fluid to flow from the inlet chamber to the respective outlet chamber
Data Source
AI summary
There is disclosed a flow arrangement 100 for an electrolyser, comprising: first and second porous walls 110, 120, corresponding to first and second electrodes of the electrolyser; an inlet chamber 102 disposed between the first and second porous walls and configured to receive a fluid through an inlet; first and second outlet chambers 130, 140 for retaining respective fluid reaction products of electrolysis. One of, or each of, the porous walls has a discontinuous porous structure comprising a body 116 and a plurality of porous regions 117 extending through the body at discrete locations to permit the fluid to flow from the inlet chamber to the respective outlet chamber, each porous region defining a respective network of flow paths through the body. There is also disclosed an electrolyser and electrolysis installation, methods of operation, and methods of manufacture.