Electrochromic Element Third Electrode Charge Balance
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Solution Overview
Problem
Electrochromic elements face issues with charge imbalance leading to decoloring failures and changes in absorption spectra, resulting in reduced color reproducibility and increased power consumption.
Innovation Solution
Incorporating a third electrode with a redox substance that is more easily oxidized or reduced than the organic electrochromic compounds, allowing for effective charge rebalancing and maintaining the original absorption spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redox buffers more easily oxidized or reduced than EC materials are used, then charge imbalance is suppressed and decoloring failure is reduced, but current that does not contribute to coloring flows unnecessarily, increasing power consumption and reducing response speed
Solution Approach 1:
The patent changes the redox potential parameters of the buffer materials so that they are closer to the EC materials, rather than being significantly more easily oxidized or reduced. This parameter adjustment allows the buffers to effectively balance charge without causing excessive non-contributory current flow, thus reducing power consumption while maintaining reliability
Solution Approach 2:
The patent introduces a dynamic balance mechanism where the redox buffers actively participate in charge balancing during both coloring and decoloring operations. The buffers dynamically adjust their redox state to compensate for charge imbalance, preventing decoloring failure while minimizing unnecessary current flow through coordinated redox reactions
2Reliability
If redox buffers more easily oxidized or reduced than EC materials are used, then charge balance region is added and color fluctuation is suppressed, but response speed is reduced due to unnecessary redox reactions
Solution Approach 1:
The patent optimizes the redox potential parameters of the buffer materials to be closer to the EC materials, reducing the potential difference that drives unnecessary redox reactions. This parameter tuning suppresses color fluctuation while maintaining fast response speed by minimizing the kinetic barrier for EC material reactions
3Reliability
If redox buffers are used to suppress decoloring failure, then charge imbalance is partially addressed, but the ratio of colored forms of anodic to cathodic EC materials changes, affecting absorption spectrum and color reproducibility
Solution Approach 1:
The patent uses redox buffers as intermediary substances that mediate charge transfer between the anodic and cathodic EC materials. These buffer intermediaries facilitate balanced charge compensation on both electrodes, maintaining the correct ratio of colored forms and ensuring accurate absorption spectrum and color reproducibility while preventing decoloring failure
Solution Approach 2:
The patent carefully selects and adjusts the redox potential parameters of the buffer materials to match the operating potentials of both anodic and cathodic EC materials. This parameter matching ensures that the buffers facilitate charge balancing without altering the equilibrium ratio of colored forms, thereby maintaining color reproducibility
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 effectively corrects charge imbalance, improves transmittance, and maintains the original absorption spectrum, reducing power consumption and enhancing color reproducibility.
Implementation Method 1
an electrochemical redox reaction
Implementation Method 2
EC material as a substance that undergoes changes in optical absorption properties (absorption wavelength and absorbance) through an electrochemical redox reaction
Data Source
AI summary
Provided is an electrochromic element, which is capable of correcting possible charge imbalance, and is suppressed in color remaining, the electrochromic element including: a first electrode; a second electrode; a third electrode; and an electrolyte, an anodic organic electrochromic compound, and a cathodic redox substance that are arranged between the first electrode and the second electrode, at least one of the first electrode and the second electrode being transparent, in which: the third electrode is electrically connectable to at least one of the first electrode and the second electrode through the electrolyte; the third electrode further has a redox substance; and a reduced form of the redox substance of the third electrode is more easily oxidized than a reduced form of the anodic organic electrochromic compound.