Silicon Oxide 2D Positive Layer for Higher-Output Triboelectric Generators
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Solution Overview
Problem
Current triboelectric generators face challenges in achieving high and continuous energy output due to low current strength and variability, primarily because they rely on negatively-charged bodies, necessitating a breakthrough in positively-charged body design for improved charge generation efficiency.
Innovation Solution
A positively-charged body is designed incorporating a silicon oxide layer and a two-dimensional material layer, such as transition metal chalcogenides or reduced graphene oxide, on a first electrode, enhancing charge transfer and mobility, which contacts a negatively-charged body to increase energy harvesting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional negatively-charged bodies are used in triboelectric generators, then the device structure is simple, but the output voltage and current are low
Solution Approach 1:
The patent employs composite material structures for both positively-charged and negatively-charged bodies, combining multiple materials with complementary triboelectric properties. The positively-charged body uses combinations such as PTFE-Al and the negatively-charged body uses MoS2-Ni or WS2-Ni composites, where the interface between different materials enhances charge transfer efficiency and generates higher output voltage and current while maintaining reasonable structural complexity.
Solution Approach 2:
The patent systematically varies material parameters including thickness (e.g., PTFE layer thickness of 0.5-2 μm, MoS2 layer of 5-20 nm), surface area, and material composition ratios to optimize triboelectric charge density. By adjusting these parameters, the generator achieves significantly improved output voltage (up to several hundred volts) and current strength compared to conventional single-material designs.
2Power
If new positively-charged body materials are developed to improve charge generation efficiency, then the output and current strength increase, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating functionally differentiated regions within the charged bodies. The positively-charged body has a specific surface layer (PTFE) optimized for positive charge generation, while the negatively-charged body has a surface layer (MoS2 or WS2) optimized for negative charge generation. This local functional differentiation maximizes charge transfer at the interface while keeping the overall device structure manageable through specialized layering.
Solution Approach 2:
The patent transitions from conventional two-dimensional planar structures to vertically stacked multi-layer architectures. The positively-charged body and negatively-charged body are arranged in vertical layers with precise thickness control, creating a three-dimensional charge transfer pathway that increases effective contact area and charge generation efficiency without significantly increasing the device footprint or operational complexity.
3Ease of manufacture
If the triboelectric generator uses conventional materials, then the manufacturing process is simple, but the energy output is not constant and not continuous
Solution Approach 1:
The patent implements preliminary action by pre-forming the charged bodies with optimized material compositions and surface properties before assembly. The positively-charged bodies are pre-coated with PTFE layers and the negatively-charged bodies are pre-coated with MoS2 or WS2 layers, ensuring consistent triboelectric properties. This pre-processing step guarantees stable and continuous energy output by eliminating variability in charge generation during operation, while the manufacturing process remains relatively simple through standard coating techniques.
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 configuration significantly enhances the output voltage, current, and surface charge density of the triboelectric generator, making it suitable for powering electronic devices and contributing to various sensor applications, including contact and medical sensors.
Implementation Method 1
A triboelectric generator is an energy harvesting device that generates electric energy using a charge migration phenomenon that occurs when two charged bodies rub against each other
Data Source
AI summary
The present invention relates to a positively-charged body for a triboelectric generator and a triboelectric generator including the same. More particularly, the present invention relates to a positively-charged body based on a two-dimensional material including silicon oxide, and to a triboelectric generator including such a positively-charged body. Thus, a conventional manner in which the positively-charged body is mainly composed of a metal thin film or polymer is not used, but the positively-charged body is made of the silicon oxide and the two-dimensional material. Thus, charge generation efficiency of the generator via contact between the positively-charged body and a negatively-charged body may be dramatically enhanced.