Direct Coupling Device for Solar Hydrogen Production
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Solution Overview
Problem
Existing solar-powered hydrogen production systems face inefficiencies and reduced service life due to the use of water vapor and contamination from ionic contaminants in liquid water, which affects the performance and longevity of proton exchange membranes in water electrolyzers.
Innovation Solution
A direct coupling device that uses a Fresnel lens to concentrate sunlight, converting it into electrical and thermal energy to power a proton exchange membrane water electrolyser with individualized anodic and cathodic catalyst zones, and includes regeneration electrodes to manage contamination and extend membrane life, utilizing very pure water to minimize ionic contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid water is used in conventional electrolyzers, then hydrogen production is enabled, but ionic contaminants accumulate and reduce membrane performance and service life
Solution Approach 1:
The electrolyzer is divided into multiple independent flow fields with separate channels for reactant supply and product removal. This segmentation allows for better control of water flow and contaminant management, preventing ionic contaminant accumulation while maintaining continuous hydrogen production
Solution Approach 2:
Water is pre-treated and purified before entering the electrolyzer to remove ionic contaminants in advance. This preliminary action prevents contamination from occurring in the first place, extending membrane service life while maintaining productivity
2Reliability
If water vapor is used instead of liquid water, then contamination is avoided, but conversion efficiency and productivity decrease
Solution Approach 1:
The system operates with liquid water at controlled temperatures and pressures, changing the physical parameters of water delivery to achieve both high efficiency and low contamination. By optimizing temperature and pressure parameters, the system maintains water in liquid form while preventing ionic contaminant accumulation through improved flow dynamics
3Reliability
If high purity water is used to minimize ionic contaminants, then membrane service life is extended, but water preparation costs and system complexity increase
Solution Approach 1:
Ion-exchange membranes or resin beds are introduced as intermediary components that selectively remove ionic contaminants from water without requiring complex purification systems. These intermediaries passively filter contaminants while allowing water to flow through, extending membrane life with minimal added complexity
4Device complexity
If concentrated sunlight is converted to electrical energy only, then the system is simpler, but thermal energy is wasted and overall energy utilization decreases
Solution Approach 1:
The solar concentrator system is designed to perform multiple functions simultaneously: generating electrical energy for the electrolyzer and producing thermal energy for water heating and process heat. This multi-functionality ensures complete utilization of concentrated solar energy, eliminating waste while maintaining system simplicity
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 achieves improved hydrogen production performance and extended service life by effectively managing contamination and optimizing energy conversion, allowing the use of less pure water while maintaining high resistivity and reducing operational costs.
Implementation Method 1
sunlight is collected and concentrated at a factor of 200 x or more using a Fresnel lens 30
Implementation Method 2
The optical concentration element 15 is made of glass with suitable optical composition... which redirects and further concentrates the sunlight falling on its upper surface in a multiple junction type photovoltaic cell 14
Implementation Method 3
The solar energy that is not directly converted into electrical energy by photovoltaic cell 14 is absorbed as thermal energy by the heat exchanger 13
Implementation Method 4
The direct coupling device 31 comprises a proton exchange membrane 2
Implementation Method 5
several individualized anodic and cathodic catalyst coated zones... where electrical energy feeds the electrochemical electrolysis of the water, resulting in the generation of hydrogen and oxygen
Data Source
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AI summary
This invention is a direct coupling device (31) to generate hydrogen from concentrated sunlight comprised of a solar concentrator (32) and a water electrolyser (33) where the solar concentrator (32) is comprised of an optical concentration element (15), adjacent to a number of photovoltaic cells (14) coupled to a heat exchanger (13) and the water electrolyser (33) comprised of a proton exchange membrane (2) in which the membrane is comprised of a number of individualized anode zones (6) and cathodic zones (12) coated with a catalyst, a number of cathode single-polar plates (3) and a number of anode single-polar plates (5), a number of regeneration electrodes (1), a number of floating flow guide plates (7), a number of elastic compression elements (8) and a casing consisting of an upper (9) and a lower (10) part.