Electrolyte Elastic Turbulence for Electrolysis Bubble Detachment
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Solution Overview
Problem
In electrochemical systems, the formation of gas bubbles on solid surfaces reduces the available surface area for electrochemical reactions due to adhesion, leading to a decrease in current density, particularly in systems with liquid flow where porous electrodes are used, as they impede gas movement and mask reaction sites.
Innovation Solution
Employing the phenomenon of elastic turbulence in electrolyte liquids by incorporating solutes like high molecular weight polymers or viscoelastic surfactants that form worm-like micelles, combined with flow paths that induce repeated changes in direction, to enhance gas release from solid surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the surface area of an electrode is increased within a constant outline size, then the current density is improved, but the permeability of the electrode decreases causing higher pressure-drop
Solution Approach 1:
The patent changes the physical-chemical parameters of the electrolyte by adding polymers or surfactants that induce elastic turbulence at low Reynolds numbers. This allows enhanced mass transport and bubble detachment without increasing flow velocity or pressure drop, thus maintaining high current density while reducing circulation energy consumption.
Solution Approach 2:
The patent replaces the conventional mechanical approach (increasing flow velocity or pressure drop to detach bubbles) with a rheological approach (inducing elastic turbulence through polymer/surfactant additives). This substitution achieves bubble removal and enhanced mass transport without the energy penalty of increased mechanical circulation.
2Productivity
If porous material is used as electrode to increase surface area, then the current density is improved, but gas bubbles are trapped causing masking of reaction sites
Solution Approach 1:
The patent introduces polymers or surfactants as intermediary substances that modify the rheological properties of the electrolyte. These intermediaries create elastic turbulence that facilitates bubble detachment from the porous electrode surface, preventing masking while maintaining the high surface area benefit.
Solution Approach 2:
The patent changes the rheological parameters of the electrolyte (viscosity, elasticity) by adding polymers or surfactants. This creates elastic turbulence that enhances bubble detachment from porous surfaces without compromising the electrode's high surface area structure.
3Productivity
If flow velocity is increased to remove gas bubbles, then the electrode surface availability is improved, but the energy consumption for liquid circulation increases
Solution Approach 1:
The patent replaces the mechanical solution (increasing flow velocity) with a rheological solution (inducing elastic turbulence through polymer/surfactant additives). This achieves effective bubble removal and maintains electrode surface availability without the energy cost of increased circulation velocity.
Solution Approach 2:
The patent changes the rheological parameters of the electrolyte to induce elastic turbulence at low flow velocities. This allows effective bubble detachment and maintains electrode surface availability while minimizing the energy required for liquid circulation.
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
Elastic turbulence maintains a higher electrode surface availability for reactions by detaching gas bubbles before they grow large, thereby improving current density and reducing energy consumption for liquid circulation.
Implementation Method 1
the electrolyte liquid is a solution in which a solute enables the liquid to display elastic turbulence, and the liquid flow paths are configured to compel changes in the direction of liquid flow, to cause elastic turbulence within flow of the electrolyte liquid in contact with the solid surface
Implementation Method 2
the system comprises at least one pump for propelling the electrolyte liquid along the flow paths, wherein the electrolyte liquid is a solution in which a solute enables the liquid to display elastic turbulence
Implementation Method 3
Interfacial tension causes the very small bubbles to adhere to the solid surface
Data Source
AI summary
An electrochemical half-cell operates to form a gas at a solid surface which may be an electrode. The electrolyte liquid comprises an additive, which is a high molecular weight flexible linear polymer or a viscoelastic linear surfactant. A flow path through the half-cell is configured to compel flow of liquid through the half-cell to make a succession of changes of direction. The electrolyte liquid is pumped through the half-cell at a rate which is sufficient that the additive and flow path configuration put the flowing electrolyte in a state of elastic turbulence which causes bubbles of gas to detach from the surface on which they are formed while they are still small, freeing the surface area for further reaction. The half-cell may be part of an electrolyser making hydrogen and oxygen from water.