Ionic Hydrogel Energy Harvester for Low-Frequency Vibration
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Solution Overview
Problem
Existing energy harvesting technologies, such as triboelectric and piezoelectric devices, face challenges in efficiently converting low-frequency mechanical vibrations into electrical energy due to low current density and complex material synthesis requirements, limiting their application in natural environments and human movements.
Innovation Solution
A polymer hydrogel-based ion energy harvester is developed by layering soft and hard hydrogels with ion selectivity, allowing selective ion transport and electrical energy generation through mechanical stress, utilizing a simple polymer chemistry approach without complex device design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If triboelectric or piezoelectric devices are used for energy harvesting, then electrical energy can be generated from mechanical vibrations, but the current density is low and material synthesis is complex
Solution Approach 1:
The patent changes the fundamental operating mechanism from electron-based (triboelectric/piezoelectric) to ion-based energy conversion. By using ionic hydrogels with different ion conductivities and selecting specific ion types (cations/anions), the system achieves higher current density through ionic charge transport while simplifying material synthesis to standard hydrogel preparation methods
Solution Approach 2:
The patent employs composite ionic hydrogel structures combining multiple hydrogel layers with different properties (ion selectivity, conductivity, mechanical characteristics). This composite approach enables simultaneous optimization of current density and ease of manufacture by leveraging the complementary strengths of different hydrogel components
2Productivity
If conventional energy harvesters are used, then energy can be harvested from mechanical vibrations, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the energy harvesting function into segmented ionic hydrogel layers, each with specific roles (ion selection, charge generation, ion transport). This segmentation allows independent optimization of each layer's properties and simplifies manufacturing by enabling modular assembly of standardized hydrogel components
Solution Approach 2:
The patent replaces complex mechanical energy conversion mechanisms (triboelectric contact, piezoelectric crystal structures) with a simpler ionic diffusion and transport mechanism in hydrogels. This substitution maintains energy harvesting functionality while dramatically reducing manufacturing complexity and cost
3Power
If ion-selective hydrogel layers are added to enable selective ion transport, then voltage output increases, but device structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating specific zones within the hydrogel structure that have distinct ion-selective properties. Each hydrogel layer is designed with localized functional characteristics (cation-selective, anion-selective, or non-selective regions) that work together to generate voltage through selective ion transport, while the overall structure remains relatively simple
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 hydrogel-based energy harvester achieves improved current density and voltage output at low frequencies, making it suitable for self-powered applications in the low-frequency range with reduced manufacturing costs and complexity.
Implementation Method 1
an energy harvester that converts vibrational energy from the outside into electrical energy can be manufactured by layering ionic hydrogels with different mechanical properties and hydrogels with cation-permeable characteristics, and completed the present disclosure
Implementation Method 2
When a polymer molecular structure forming a molecular hydrogel has a charge, the movement of cations or anions can be controlled. For example, when the molecular structure of the polymer forming a hydrogel contains anions, the penetration of anions approaching from the outside is blocked by electrostatic repulsion, but the penetration of cations approaching from the outside proceeds smoothly
Implementation Method 3
an energy harvester that converts vibrational energy from the outside into electrical energy can be manufactured by layering ionic hydrogels with different mechanical properties and hydrogels with cation-permeable characteristics
Data Source
AI summary
The present invention relates to a polymer hydrogel-based ion energy harvester, which is designed to harvest low-frequency mechanical vibrations by using slow diffusion of ions, as an alternative to a conventional energy harvesting technique based on electron transfer or electron conduction. The ionic hydrogel-based energy harvester according to the present invention has very superior advantages compared with existing methods in terms of extracted current density, manufacturing cost, manufacturing method, and the like, by manufacturing energy elements through simple stacking of polymer hydrogels.