Switchable Hydride Smart Window Ternary Alloy Coating
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Solution Overview
Problem
Existing switchable smart glass technologies face issues with durability due to oxidation of the switchable layer, loss of hydrogen, diffusion of catalysts, and poisoning, leading to short lifetimes and suboptimal optical switching properties.
Innovation Solution
A switchable device using a ternary magnesium alloy (MgYTi) with a catalytic layer and a solid electrolyte, allowing for rapid and stable switching between transparent and reflective states, and incorporating a hydrogen reservoir to manage hydrogen concentration, thereby enhancing durability and optical switching performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a switchable layer with chromic properties is used to control light by absorption, then the light transmission can be switched between translucent and transparent states, but the layer is heated and radiates heat back into the room
Solution Approach 1:
The patent changes the fundamental parameter of light control mechanism from absorption to reflection. The switchable layer uses reversible hydrogenation to alter its optical properties, switching between a transparent hydrogenated state and a reflective dehydrogenated state, thereby controlling light transmission without the heat radiation problem associated with absorptive materials
Solution Approach 2:
The patent utilizes phase transitions in the form of reversible hydrogenation and dehydrogenation of the magnesium alloy layer. The layer transitions between a hydrogenated transparent state and a dehydrogenated reflective state, enabling optical switching through phase change rather than thermal absorption
2Illumination intensity
If existing smart glass technologies are used, then light transmission switching is achieved, but durability is reduced due to oxidation, hydrogen loss, catalyst diffusion, and poisoning
Solution Approach 1:
The patent introduces a solid electrolyte layer as an intermediary between the switchable magnesium alloy layer and the catalyst layer. This solid electrolyte acts as a barrier that prevents direct contact and interaction between the magnesium alloy and catalyst, thereby preventing catalyst diffusion into the alloy and poisoning of the alloy, while still allowing ionic transport for hydrogenation/dehydrogenation reactions
Solution Approach 2:
The patent replaces traditional liquid electrolytes with solid electrolyte materials that are more stable and durable. The solid electrolyte layer provides long-term stability by preventing degradation mechanisms such as evaporation, leakage, and chemical decomposition that affect liquid electrolyte systems
3Device complexity
If traditional binary magnesium alloys are used as switchable layers, then the device structure is simple, but the optical switching properties are suboptimal
Solution Approach 1:
The patent transitions from binary magnesium alloys to ternary magnesium alloys containing magnesium, rare earth elements (such as yttrium, neodymium, or erbium), and transition metals (such as nickel or copper). This composite alloy composition provides superior optical switching properties, including higher reflectivity in the dehydrogenated state and better reversibility, while maintaining structural stability
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 provides improved durability and optical switching properties, including high delta transmission and extended device lifetime, with rapid switching times and reduced energy consumption, while maintaining low sheet resistance and uniformity.
Implementation Method 1
The switchable layer controls light by absorbing light
Implementation Method 2
the switchable layer can be reversibly switched between a transparent state by hydrogenation and a mirror state (metal state) by dehydrogenation
Implementation Method 3
the switchable layer can be reversibly switched between a transparent state by hydrogenation and a mirror state (metal state) by dehydrogenation
Implementation Method 4
the switchable layer can be reversibly switched between a transparent state by hydrogenation and a mirror state (metal state) by dehydrogenation
Implementation Method 5
a catalytic layer, formed of a catalyst that promotes the transfer of hydrogen between the switchable layer and the gas phase
Implementation Method 6
a solid electrolyte layer formed of an ionic conductor that allows for ionic conduction between the catalytic layer and the ion storage layer
Data Source
AI summary
A switchable hydride smart window solid thin film coating having variable opacity and the methods for producing the same is described. The coating includes the following layers deposited on substrate such as glass: a switchable layer, an optional barrier layer, a catalyst layer, an optional barrier layer, a solid electrode, an ion storage layer, an optional insulating layer and a transparent conductor layer. The switchable layer is preferably formed of a magnesium alloy and ore preferable, a ternary alloy of magnesium along with two additional rare earth metals such as yttrium (Y) and Titanium (Ti), i.e., MgYTi.