Electrochemical Cell Diffuser for Uniform Fuel Oxidation
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Solution Overview
Problem
Metal-air cells face issues such as the buildup of precipitated reaction products, sluggish fuel oxidation due to increased oxidized fuel concentration, and inefficient charging mechanisms, particularly in electrodeposited fuel systems.
Innovation Solution
The electrochemical cell design features a diffuser with perpendicular flow gaps between electrodes, ensuring uniform distribution of the ionically conductive medium across the first electrode for efficient fuel oxidation and oxidizer reduction, and a method for charging by reversing the electrode roles to redeposit fuel on the permeable electrode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ionically conductive medium flows directly through the electrode without a diffuser, then the cell structure is simpler, but the fuel oxidation becomes sluggish due to non-uniform flow distribution and increased oxidized fuel concentration near unoxidized fuel
Solution Approach 1:
A diffuser is introduced as an intermediary component between the flow source and the first electrode. The diffuser has a flow distribution region with multiple flow distribution channels that redirect the ionically conductive medium flow to multiple flow outlets, ensuring uniform distribution across the electrode surface. This mediator resolves the contradiction by transforming direct non-uniform flow into distributed uniform flow, improving fuel oxidation rate while maintaining reasonable structural complexity.
Solution Approach 2:
The flow distribution region of the diffuser is segmented into multiple flow distribution channels, each leading to a flow outlet. This segmentation allows the single incoming flow to be divided into multiple smaller flows that contact different regions of the first electrode simultaneously, preventing localized accumulation of oxidized fuel and enhancing overall oxidation efficiency.
2Duration of action of stationary object
If precipitated reaction products accumulate in the anode and cathode spaces, then the cell operates continuously without product removal, but the reaction efficiency decreases due to product buildup
Solution Approach 1:
The design extracts the flow distribution function from the direct electrode-flow interface and places it in the diffuser's flow distribution region. This separation allows independent optimization of flow distribution and electrochemical reactions, enabling continuous operation while maintaining high reaction efficiency through controlled uniform flow that prevents product accumulation.
3Productivity
If the flow of ionically conductive medium is non-uniform across the electrode, then the cell structure is simpler, but the fuel depletion becomes uneven leading to passivation and reduced capacity
Solution Approach 1:
The diffuser acts as a flow distribution intermediary with a flow distribution region containing multiple channels. This structure uniformly distributes the ionically conductive medium across the entire first electrode surface, ensuring even fuel depletion and preventing passivation. The mediator approach improves oxidation efficiency while keeping the overall cell structure manageable.
Solution Approach 2:
The flow distribution channels are arranged to provide locally optimized flow to different regions of the electrode. Each channel directs flow to a specific area, ensuring that all regions of the first electrode receive appropriate flow rates for efficient fuel oxidation, preventing both localized starvation and localized product accumulation.
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 design enhances the even depletion of fuel, reduces passivation, and improves the cell's efficiency, capacity, and cycle life by ensuring uniform flow and electrodeposition during both discharge and charge modes.
Implementation Method 1
distributing a flow of the ionically conductive medium with the diffuser across a cross-section of the electrochemical cell so that the ionically conductive medium flows through the first electrode substantially uniformly
Implementation Method 2
oxidizing the fuel at the first electrode
Implementation Method 3
an anode at which metal fuel is oxidized
Implementation Method 4
reducing the oxidizer at the second electrode
Implementation Method 5
a cathode to reduce an oxidizer when connected to the load
Implementation Method 6
the reducible fuel ions are reduced and electrodeposited as fuel in oxidizable form on the permeable electrode body
Data Source
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AI summary
An electrochemical cell includes a first electrode configured to operate as an anode to oxidize a fuel when connected to a load. The first electrode includes a permeable electrode body configured to allow flow of an ionically conductive medium therethrough. An electrode holder includes a cavity for holding the first electrode. A diffuser is positioned in the cavity between the first electrode and the electrode holder with a gap formed between the diffuser and the electrode holder. The diffuser includes openings configured to allow flow of the ionically conductive medium therethrough and to distribute the flow through the first electrode. A second electrode is positioned in the cavity on a side of the first electrode that is opposite the diffuser, and is configured to operate as a cathode when connected to the load and in contact with the ionically conductive medium.