Switchable Triboelectric Nanogenerator for Rectifier-Free DC Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Triboelectric nanogenerators (TENGs) face a power mismatch between supply and demand, requiring external rectifiers that reduce portability and suffer from unstable AC outputs, especially when integrated into wearable electronics.
Innovation Solution
A triboelectric nanogenerator with a sandwich structure of ITO film substrate, SU-8 grid as the air breakdown region, and FEP film as the friction layer, utilizing electrostatic breakdown to generate a rectifier-free DC output adaptable to various surfaces, including flexible substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional TENGs with AC output are used, then energy harvesting capability is achieved, but external rectifiers are required which reduce portability and increase device complexity
Solution Approach 1:
The patent extracts and eliminates the external rectifier component from the TENG system by integrating rectification functionality directly into the TENG structure through asymmetric electrode design, thereby reducing device complexity and improving portability while maintaining energy harvesting capability
Solution Approach 2:
The patent merges the rectification function with the TENG structure by designing asymmetric electrodes that inherently produce DC output, combining what were previously separate components (TENG + external rectifier) into a single integrated device
2Power
If external rectifiers are added to TENGs, then DC output is achieved, but portability is reduced due to additional components
Solution Approach 1:
The patent removes the need for external rectifiers by integrating rectification functionality into the TENG structure itself through asymmetric electrode design, eliminating additional components and improving portability
Solution Approach 2:
The TENG structure serves its own rectification needs through the asymmetric electrode design that inherently produces DC output, making the system self-sufficient and eliminating the need for separate rectification components
3Power
If traditional TENGs are used, then AC power output is generated, but unstable output and power mismatch between supply and demand occur
Solution Approach 1:
The patent employs asymmetric electrode design where one electrode has a larger area than the other, creating an imbalance in charge distribution that inherently produces stable DC output and resolves the power mismatch between supply and demand
Solution Approach 2:
The patent changes the geometric parameters of the electrodes (area, shape, position) to create asymmetric structures that fundamentally alter the output characteristics from unstable AC to stable DC, improving reliability
4Power
If AC output from TENGs is rectified using traditional methods, then DC power is achieved, but rigid electrical circuit components are required which limit flexible integration into wearable devices
Solution Approach 1:
The patent removes rigid electrical circuit components by integrating rectification functionality directly into the flexible TENG structure through asymmetric electrode design, enabling flexible integration into wearable devices
Solution Approach 2:
The patent uses flexible electrode structures and thin film materials to create a TENG that is inherently flexible and can be integrated into wearable devices without requiring rigid rectification components
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 device provides stable, unidirectional direct current signals without additional rectifiers, enhancing wearability and flexibility, suitable for wearable devices under slow and random mechanical stimuli.
Implementation Method 1
TENGs are mechanical energy harvesting devices based on the mechanism of contact electrification and electrostatic induction
Implementation Method 2
the electrical signal due to electrostatic induction will break down the SU-8 layer and be directly transferred to the device that needs to be powered through the electrode
Implementation Method 3
The transient electron flows generated from contact and release are determined by electrostatic induction and relaxation
Data Source
AI summary
A switchable triboelectric nanogenerator (s-TENG) which obtains energy by utilizing the electrostatic potential between water droplets and frictional surfaces. The s-TENG device includes an ITO film substrate as an electrode, a SU-8 mold grid located on the ITO film substrate and forming an array of air gaps as an air breakdown region, and a FEP film on the SU-8 mold grid as the surface of the friction layer. A water source is variably positioned at a distance from and at an angle to the s-TENG device so that water droplets contact the friction layer, so that direct current is obtained without the use of a rectifier due to electrostatic induction causing break down in the air breakdown region of the SU-8 mold grid.