CdTe PEC Module Layout for Low-Loss Autonomous Water Electrolysis
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Solution Overview
Problem
Existing photovoltaic (PV) systems for water electrolysis face efficiency losses due to separation of electrolyzer from PV cells, ionic losses, and instability from photocorrosion, which increase capital costs and decrease solar-to-hydrogen conversion efficiency.
Innovation Solution
Integration of cathode and anode on the same side of a CdTe PV cell in parallel configuration, with advanced materials and in-series connections, eliminating the need for complex pathways and external energy sources, and employing electrocatalysts for efficient water splitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrolyzer is separated from the PV cells, then the system can be simpler to manufacture, but efficiency losses occur due to ionic conductivity issues and multiple units are required
Solution Approach 1:
The patent merges the PV cell and electrolyzer into a single integrated PEC module, where the cathode and anode are positioned in parallel on the same side of the PV cell. This integration eliminates ionic losses between separate components and removes the need for external electrical current collectors, thereby improving solar-to-hydrogen conversion efficiency while maintaining manufacturing simplicity
2Reliability
If the cathode and anode are positioned on opposite sides of the PV cell, then ionic conductivity can be improved, but the system size must be small or complex pathways through the PV material are required
Solution Approach 1:
The patent transitions from a traditional opposite-side configuration to a parallel side-by-side configuration on the same surface of the PV cell. This dimensional rearrangement allows ionic conductors to bridge adjacent electrodes on the same side, eliminating the need for pathways through the PV bulk or small system sizes while maintaining reliable ionic conductivity
3Productivity
If both sides of the PV cell are exposed to water or numerous pores are created, then ionic losses are reduced, but corrosion pathways increase and operational life decreases
Solution Approach 1:
The patent applies local quality by positioning the cathode and anode in parallel on the same side of the PV cell, allowing water and ionic conductors to access only the localized electrode regions. This configuration reduces ionic losses while limiting corrosion exposure to specific areas rather than the entire PV cell surface, thereby preserving operational life
4Productivity
If CdTe PV cells are used, then UV light absorption and solar energy conversion are enhanced, but the voltage may be insufficient for efficient water splitting
Solution Approach 1:
The patent combines CdTe PV cells with co-catalysts (such as NiFe-LDH for oxygen evolution and Pt for hydrogen evolution) to enhance the overall system performance. The co-catalysts reduce overpotentials and improve charge transfer efficiency, enabling the CdTe cell's photovoltage to effectively drive water splitting while maintaining superior UV absorption and solar energy conversion
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
Enhances solar-to-hydrogen conversion efficiency, reduces production costs, and minimizes environmental impact by providing a sustainable hydrogen production system with reduced carbon emissions and energy payback period.
Implementation Method 1
CdTe PV cells may exhibit a direct bandgap of 1.45 electron volts (eV), which is well suited for single-junction solar energy conversion
Implementation Method 2
the electrolysis of water, which involves applying an electric current to water or an electrolyte to split it into hydrogen (H2) on the cathode and oxygen (O2) on the anode
Data Source
AI summary
Techniques for water electrolysis employing: a glass substrate layer; a transparent conductive oxide (TCO) layer including TCO electrical disconnects formed in the TCO; a photovoltaic (PV) layer including PV electrical disconnects formed in the PV layer, portions of the PV layer extending into the TCO electrical disconnects; a metal back contact (MBC) layer including MBC electrical disconnects formed in the MBC layer, portions of the MBC layer extending into the PV electrical disconnects; an insulating layer including insulating voids formed in the insulating layer to expose anode and cathode portions of the MBC layer, portions of the insulating layer extending into the MBC electrical disconnects; a metal conductor layer adjacent the insulating layer and including a metal conductor extending into insulating voids to form metal conductors electrically coupled to the exposed anode and cathode portions; catalyst coatings on the metal conductors electrically coupled to the anode and cathode portions.