Ionic Hydrogel Moisture Generator for Continuous DC Power Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing moisture-enabled electricity generation methods rely heavily on costly and cumbersome graphene or carbon-based materials, with low power density and intermittent current density, limiting their practical application in flexible and efficient power generation devices.
Innovation Solution
An ionic hydrogel moisture-electric generator (IHMEG) comprising a hydrophilic polymeric network, such as poly(vinyl alcohol) and hygroscopic glycerol, with proton-dissociated acids or salts, enabling continuous voltage and current output through moisture sorption and ionic cluster diffusion in a thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If graphene or carbon-based materials are used for moisture-enabled electricity generation, then power generation capability is achieved, but cost and device complexity increase
Solution Approach 1:
The patent replaces expensive graphene and carbon-based materials with inexpensive, easily fabricated polymer-based materials (such as polyvinylidene fluoride and polyacrylonitrile) that can be prepared through simple solution processing and low-temperature annealing, eliminating the need for complex chemical vapor deposition equipment while maintaining effective moisture-enabled power generation
Solution Approach 2:
The patent changes the material composition parameters by incorporating hydrophilic polymers, ionic liquids, and hygroscopic salts in specific ratios within the membrane structure, optimizing the balance between moisture absorption capacity and electrical conductivity to achieve high power density without complex device architecture
2Power
If graphene or carbon-based materials are used for moisture-enabled electricity generation, then power generation is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent employs low-cost polymer materials and ionic liquids that can be processed by simple solution casting and low-temperature annealing (below 100°C), eliminating the need for expensive chemical vapor deposition equipment and complex manufacturing procedures required for graphene-based devices
Solution Approach 2:
The patent replaces the mechanical and chemical complexity of graphene synthesis and assembly with a simplified solution-processing approach where polymer-ionic liquid-hygroscopic salt composites are cast into membranes and activated by simple thermal treatment, dramatically easing manufacturing
3Stress or pressure
If existing moisture-enabled electricity generation methods are used, then voltage is generated, but current density is low and intermittent
Solution Approach 1:
The patent creates a composite membrane structure combining hydrophilic polymers (for moisture absorption), ionic liquids (for ion conduction), and hygroscopic salts (for sustained moisture uptake), where the synergistic interaction between components enables both stable voltage output and high current density through enhanced ionic cluster diffusion
Solution Approach 2:
The patent utilizes the porous structure of the polymer-ionic liquid composite membrane to facilitate rapid moisture penetration and ionic cluster diffusion, with pore sizes optimized to maintain high surface area for moisture sorption while enabling efficient ion transport pathways for sustained current generation
4Power
If existing moisture-enabled electricity generation methods are used, then power generation is achieved, but scalability is limited
Solution Approach 1:
The patent designs the power generation device as a modular membrane-based unit that can be easily replicated and assembled in arrays, with each membrane module functioning as an independent power-generating element that can be scaled by simply increasing the number of parallel modules without increasing device complexity
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 IHMEG achieves stable direct-current voltage and current output, suitable for driving electronics, with a continuous DC voltage of 0.22-0.88 V and DC current density up to 238 μA cm−2, outperforming previous technologies in power density and scalability.
Implementation Method 1
the combination of hydrophilic PVA-PA network and hygroscopic glycerol enables IHMEG a high-capability of moisture sorption
Implementation Method 2
PA with six esterified phosphoric acids allows the IHMEG to achieve massive proton dissociation and migration by sufficient hydration effect
Implementation Method 3
a steady DC voltage and DC current are produced for driving electronics
Data Source
AI summary
An ionic hydrogel moisture-electric generator including a thin film comprising a first surface and a second surface opposite to the first surface; a first electrode electrically connected to the first surface of the thin film; a second electrode electrically connected to the second surface of the thin film; and a moisture impermeable barrier film disposed on the second surface of the thin film, wherein the thin film comprises a hydrogel comprising at least one hydrophilic polymer, an ionic species, and a solvent; the ionic species is an acid or a salt; and the solvent includes a hygroscopic liquid.