Segmented Photoelectrode Design for Scalable Water Splitting
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Solution Overview
Problem
Current photoelectrochemical water splitting technologies face challenges in scaling up due to reduced efficiency caused by sheet resistance, fabrication method differences, spatial defects, and high energy loss from membrane separators, which hinder the realization of large-scale hydrogen gas production from solar energy.
Innovation Solution
A photoelectrochemical photoelectrode design featuring multiple plate-type electrodes with a transparent substrate, a photoanode layer, and a reflector to optimize light utilization and electron migration, allowing for efficient water splitting while maintaining performance at larger scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of a photoelectrode is increased for scale-up, then the production capacity is improved, but the total efficiency is reduced due to sheet resistance
Solution Approach 1:
The photoelectrode is divided into multiple segments (first photoelectrode and second photoelectrode) arranged in series. Each segment has its own light-receiving surface and contributes to the overall voltage generation. This segmentation allows the system to achieve higher production capacity through multiple electrodes while maintaining efficiency by limiting the size and sheet resistance impact of each individual electrode segment.
2Object-generated harmful factors
If a membrane separator is used for fuel separation, then the separation of H2 and O2 is improved, but energy loss increases
Solution Approach 1:
The membrane separator component is completely removed from the system. Instead of using a membrane to separate fuels, the invention arranges the first and second photoelectrodes in series configuration where each electrode independently generates voltage. The electrical series connection inherently separates the fuel generation processes while avoiding the energy loss associated with membrane separators.
3Area of stationary object
If spatial defects and increased ohmic resistance occur during scale-up fabrication, then the manufacturing area is improved, but the photoelectrode efficiency is reduced
Solution Approach 1:
The system uses multiple smaller photoelectrode segments rather than one large electrode. This segmentation allows each segment to be fabricated with higher precision and fewer spatial defects, while the series connection of multiple segments achieves the required total voltage and power output, effectively scaling up the system without sacrificing efficiency.
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 proposed design enhances water splitting efficiency by reducing electron migration distance and improving light utilization, enabling scalable hydrogen gas production with minimized energy loss and increased cost-effectiveness.
Implementation Method 1
a photoanode layer disposed on the transparent electrode substrate
Implementation Method 2
the plural plate-type photoelectrodes are spaced apart from each other by a predetermined interval so that they may be disposed face-to-face
Data Source
AI summary
The present disclosure relates to a photoelectrochemical photoelectrode for water splitting, which includes a plate-type photoelectrode including a transparent electrode substrate and a photoanode layer disposed on the transparent electrode substrate, wherein the plate-type photoelectrode exists in a plural number, and the plural plate-type photoelectrodes are disposed in such a manner that the transparent electrode substrate of one photoelectrode may face the photoanode layer of the other photoelectrode, while being spaced apart from each other. In this manner, it is possible to scale-up the photoelectrochemical photoelectrode for water splitting, while providing improved water splitting performance.