Hydrogen Production Through Full-Spectrum Light Conversion
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Solution Overview
Problem
Existing hydrogen production technologies utilizing photocatalysts are inefficient in utilizing the full spectrum of sunlight, particularly the ultraviolet, visible, and infrared regions, leading to suboptimal light utilization efficiency.
Innovation Solution
A hydrogen production apparatus is designed with a wavelength separation unit, infrared and ultraviolet light conversion units, and a photocatalyst to convert and condense light across the visible spectrum, enhancing light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a photocatalyst active in the ultraviolet light region is used, then the photocatalyst reaction becomes active at higher light intensity regions, but the infrared light energy (1,000 nm or above) cannot be utilized for water decomposition
Solution Approach 1:
The patent divides the sunlight spectrum into multiple wavelength regions (ultraviolet, visible, infrared) and processes each region separately through different optical systems. The wavelength separation unit separates sunlight by wavelength, and different optical systems convert each region to visible light suitable for photocatalyst activation, thereby resolving the contradiction between utilizing broad spectrum and maintaining photocatalyst effectiveness.
Solution Approach 2:
The patent introduces wavelength conversion materials as intermediaries that convert infrared and ultraviolet light to visible light. These conversion units act as mediators between the broad sunlight spectrum and the photocatalyst's specific visible light absorption requirement, enabling the photocatalyst to utilize a wider spectrum while maintaining reaction effectiveness.
2Loss of energy
If the spectrum of sunlight is utilized from ultraviolet to infrared, then more energy can be captured, but the photocatalyst cannot directly utilize infrared light with energy less than 1.23 V required for water decomposition
Solution Approach 1:
The patent changes the wavelength parameter of infrared and ultraviolet light through wavelength conversion to transform them into visible light with appropriate energy levels. This parameter transformation enables the photocatalyst to effectively utilize these wavelength regions while maintaining the necessary energy threshold (1.23 V) for water decomposition, thereby reducing energy loss without compromising reaction effectiveness.
3Productivity
If a joint type Z-scheme catalyst is used for complete decomposition reaction, then high activity is achieved, but there is no description on effective utilization of light from wide wavelength region
Solution Approach 1:
The patent creates a multi-functional system where the wavelength separation unit and multiple optical systems work together to handle different wavelength regions. This universal approach enables the Z-scheme catalyst system to effectively utilize light across a broad spectrum (ultraviolet to infrared) while maintaining high hydrogen production activity, thereby achieving both high productivity and broad spectral adaptability.
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 apparatus efficiently utilizes a wide range of sunlight wavelengths, improving overall light utilization efficiency and enhancing hydrogen production.
Implementation Method 1
a wavelength separation unit separating sunlight by wavelength
Implementation Method 2
an infrared light conversion unit converting infrared light separated by the wavelength separation unit to visible light
Implementation Method 3
an ultraviolet light conversion unit converting ultraviolet light separated by the wavelength separation unit to visible light
Implementation Method 4
a photocatalyst generating a hydrogen gas from water by irradiating light
Data Source
AI summary
A hydrogen production apparatus including a photocatalyst and generating hydrogen from water includes a wavelength separation unit separating sunlight by wavelength, an infrared light conversion unit converting infrared light separated by the wavelength separation unit to visible light, and an ultraviolet light conversion unit converting ultraviolet light separated by the wavelength separation unit to visible light.