Electrochromic Device Using Epsilon Tungsten Trioxide
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Solution Overview
Problem
Existing electrochromic devices that utilize tungsten trioxide (WO3) require ion storage layers and electrolytic layers, which are costly, difficult to manufacture, and can be environmentally harmful due to the use of lithium.
Innovation Solution
The use of epsilon phase tungsten trioxide (ε-WO3) in electrochromic devices, which eliminates the need for ion storage layers, electrolyte layers, and lithium, leveraging asymmetric ferroelectric properties for reversible coloration and polarization switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional WO3 electrochromic devices use ion storage layers and electrolytic layers to enable coloration changes, then electrochromic functionality is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the ion storage layer and electrolytic layer from the traditional WO3 electrochromic device structure. By extracting these unnecessary components, the invention achieves electrochromic functionality using only the WO3 layer, thereby reducing device complexity and manufacturing difficulty while maintaining the core electrochromic function.
Solution Approach 2:
The WO3 layer itself serves multiple functions: it acts as the electrochromic active material, the ion storage reservoir, and the electrolyte medium. This self-service approach eliminates the need for separate dedicated layers, simplifying the overall device structure while maintaining electrochromic functionality.
2Reliability
If lithium is used in electrochromic devices to enable ion intercalation, then electrochromic coloration is achieved, but environmental harm and health risks increase
Solution Approach 1:
The patent replaces lithium, a harmful and environmentally problematic metal, with alternative ion intercalation mechanisms that do not require lithium. This substitution eliminates the environmental and health risks associated with lithium while maintaining the electrochromic coloration function.
Solution Approach 2:
The invention converts the potentially harmful presence of lithium into a beneficial absence of harmful substances. By eliminating lithium from the device composition, the patent achieves electrochromic functionality without the environmental and health hazards, turning a harmful feature into a beneficial clean design.
3Reliability
If ion intercalation is used to drive coloration changes in WO3, then electrochromic response is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent merges the functions of the electrochromic layer, ion storage layer, and electrolyte layer into a single integrated WO3 layer. This consolidation simplifies the manufacturing process by reducing the number of separate components and assembly steps, thereby lowering manufacturing cost and complexity while maintaining electrochromic response.
Solution Approach 2:
The WO3 layer is designed to perform multiple functions simultaneously: electrochromic coloration, ion storage, and electrolyte provision. This multi-functionality eliminates the need for separate dedicated layers, simplifying manufacturing and reducing costs while achieving reliable electrochromic 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
This approach results in simpler, less expensive, and easier-to-manufacture electrochromic devices that exhibit both electrochromic and ferroelectric properties, without relying on ion intercalation, thus reducing environmental impact.
Implementation Method 1
the reversible coloration of the electrochromic devices described herein is resultant from the asymmetric ferroelectric properties associated with ε-WO3, such properties being coupled with the polarization switching of the devices
Implementation Method 2
Electrochromic materials exhibit reversible changes in optical properties, such as, for example, reflectance, absorbance, and/or transmittance in the presence of an applied voltage
Data Source
AI summary
An electrochromic device comprising a substrate, a set of electrodes disposed on or within the substrate, and a layer comprising ε-WO3 disposed in electrical communication with the set of electrodes, wherein the layer of ε-WO3 exhibits polarization switching are described. Methods of making and using the electrochromic devices are also described. The electrochromic devices are used for detecting acetone in a fluid. The observed change in color of the ε-WO3 layer can be correlated with a subject's medical condition, such as diabetes.