Self-Powered Piezoelectric Catalyst for Light-Shielded Water Treatment
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Solution Overview
Problem
Photocatalysts, activated by light, are ineffective in deep-water or light-shielded environments for decomposing organic matter in water, as they require external light energy for activation.
Innovation Solution
A self-powered piezoelectric structure that combines a catalytic material with a piezoelectric material, allowing activation through externally applied mechanical force to generate piezoelectric potential, enabling catalytic reactions without external light sources, using materials like TiO2, ZnO, or MoS2 with PVDF-TrFE as the piezoelectric polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photocatalyst is used to decompose organic matters in water, then decomposition efficiency is improved, but it cannot be used in deep-water or light-shielded environments
Solution Approach 1:
The invention changes the activation parameter of the catalyst from light-dependent to piezoelectricity-dependent. By incorporating piezoelectric materials (such as PVDF-TrFE) with the catalytic material, the system can be activated by mechanical stress-induced piezoelectric potential rather than requiring light illumination, enabling operation in deep-water and light-shielded environments.
Solution Approach 2:
The invention creates a composite catalyst layer combining catalytic materials (such as TiO2, ZnO, or MoS2) with piezoelectric materials. This composite structure allows the catalytic material to be activated by piezoelectric potential generated from mechanical deformation, eliminating the need for light sources while maintaining catalytic functionality.
2Reliability
If light illumination lamp is provided to activate photocatalyst, then catalytic reaction is activated, but external energy source is required
Solution Approach 1:
The invention makes the catalyst system self-activating through piezoelectric effect. The catalytic material embedded in or combined with piezoelectric material can be activated by piezoelectric potential generated from mechanical deformation of the substrate, eliminating the need for external light sources or energy input.
Solution Approach 2:
The invention replaces the optical activation mechanism (light illumination) with a mechanical activation mechanism (piezoelectric potential generation through mechanical stress). This substitution allows catalyst activation without requiring light energy input.
3Reliability
If catalytic material is mixed with piezoelectric material, then self-activation is achieved, but catalytic material exposure is reduced
Solution Approach 1:
The invention applies local quality by creating regions with different catalytic material concentrations or exposure levels within the catalyst layer. This allows optimization of both piezoelectric activation (requiring intimate contact between materials) and catalytic reaction (requiring material exposure to reactants).
Solution Approach 2:
The invention utilizes porous structures in the catalyst layer to increase the effective surface area of catalytic material while maintaining close contact with piezoelectric material. The porous architecture allows reactants to access catalytic sites while the piezoelectric effect can still be effectively transmitted through the structure.
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
Enables effective decomposition of organic matter in water even in deep-water or light-shielded environments, enhancing catalytic reaction efficiency by exposing catalytic materials to mechanical deformation, thus eliminating the need for external light sources.
Implementation Method 1
when a force is externally applied to the base material, the catalytic material in the catalyst layer is activated by a potential generated from the piezoelectric material in the catalyst layer
Implementation Method 2
The photocatalyst generates therein electrons and holes by using the light and decomposes water into hydroxide (—OH) and proton (H+) by using the same. By the oxidation/reduction process of the water, it is possible to decompose the organic matters in the water
Implementation Method 3
a catalyst layer formed by using a mixture of a catalytic material, which can be activated when the energy is applied thereto from an outside
Data Source
AI summary
According to an illustrative embodiment of the present invention, a self-powered piezoelectric structure is provided which includes a base material that can be bent by an externally applied force, and a catalyst layer formed on the base material, wherein the catalyst layer is formed by using a mixture of a catalytic material, which can be activated when the energy is applied thereto from an outside, and a piezoelectric material.