Electrochemical Polymer Electrode for Low-Voltage Volume Expansion
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Solution Overview
Problem
Conducting polymers used in electrochemical actuators face limitations due to limited deposition thickness and non-homogeneous film structure, restricting macroscopic volume changes and requiring high voltages, which are not efficiently addressed by existing materials and devices.
Innovation Solution
A device comprising a first and second electrode within a liquid electrolyte, where the first electrode is coated with a conducting macromolecular material that can switch from a contracted to an expanded state with a volume increase of at least 2.5 times the initial volume upon electrochemical switching, using low voltages and aqueous electrolytes to achieve high volume changes without electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conducting polymers are used in electrochemical actuators, then volume change can be achieved, but the deposition thickness is limited and film structure is non-homogeneous, restricting macroscopic volume changes
Solution Approach 1:
The patent changes the fundamental parameters of the conducting polymer system by using novel synthesis methods to achieve homogeneous film structures with controlled thickness, enabling macroscopic volume changes while maintaining structural uniformity throughout the material
Solution Approach 2:
The invention combines conducting polymers with specific additives and uses composite electrode structures to achieve both homogeneous film formation and large-scale volume changes, overcoming the limitations of pure conducting polymer systems
2Ease of operation
If high voltage is applied to achieve volume changes in conducting polymers, then switching effect is achieved, but electrolysis occurs and efficiency is reduced
Solution Approach 1:
The patent optimizes the electrochemical parameters including voltage, current density, and electrolyte composition to achieve effective polymer switching at lower voltages, preventing electrolysis while maintaining the desired volume change effect
Solution Approach 2:
The invention uses specific electrolyte additives and mediators that facilitate the electrochemical switching process at lower potentials, reducing the risk of electrolysis while maintaining efficient volume change response
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 solution enables significant volume changes of up to 1000% with low voltage application, allowing for enhanced applications in actuators, microfluidic systems, and drug release, while maintaining conductivity and stability across multiple cycles.
Implementation Method 1
Conducting polymers can change in volume during electrochemical doping (oxidation) or dedoping (reduction)
Implementation Method 2
When the film is dedoped (reduced) the cations will enter the film to compensate the dopant molecules thus the film will swell. Moreover, when the material is doped the cations that have been compensating the dopant will be expelled from the film and the film will collapse
Implementation Method 3
The mechanism of volume change has been described by inclusion and ions within the film
Data Source
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Figure 1d)~1e)
Figure 1f)~1k)
AI summary
The present disclosure relates to a device comprising a first electrode, a second electrode, and a liquid electrolyte, wherein said first and second electrodes are arranged within said liquid electrolyte and arranged for applying a voltage to said electrodes, and further wherein said first electrode comprises a macromolecular material that is transferrable from a first state to a second state upon electrochemical switching due to said voltage applied between said electrodes, and wherein said material when present in said second state having a volume of at least 2.5 of the volume of said material in said first state.