Interdigitated Electrodes for Artificial Photosynthesis Reactors
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Solution Overview
Problem
In artificial photosynthesis systems, the efficiency of chemical reactions is hindered by the difficulty in maintaining a short distance between electrodes for oxidation and reduction reactions, which limits the uniform circulation of electrolytic solutions and reduces reaction efficiency as cell size increases, especially in integrated-type cells, and complicates the supply and discharge of reactants and products in facing-type cells.
Innovation Solution
The configuration of interdigitated-type electrodes on the same surface of a substrate, with crystalline silicon solar cells connected in series, allows for efficient proton movement and electrolyte circulation, enabling high conversion efficiency and scalable chemical reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between electrodes for oxidation and reduction reactions is shortened to achieve high conversion efficiency, then proton flow efficiency is improved, but in facing-type cells it becomes difficult to uniformly circulate sufficient electrolytic solution to supply raw materials and discharge products
Solution Approach 1:
The patent transitions from a facing-type electrode configuration (electrodes on opposite surfaces) to an interdigitated electrode configuration (electrodes on the same surface). This dimensional rearrangement allows both oxidation and reduction electrodes to coexist on one surface without requiring short spacing, thereby maintaining sufficient electrolytic solution circulation paths while achieving high conversion efficiency through optimized electrode layout.
Solution Approach 2:
The patent divides the electrode functions into distinct interdigitated regions on the same surface, with oxidation electrodes and reduction electrodes arranged alternately. This segmentation allows independent optimization of each electrode type while maintaining close proximity for efficient proton transfer, resolving the conflict between short distance requirement and solution circulation.
2Quantity of substance
If the size of the cell is increased in integrated-type cells, then the cell can handle larger scale reactions, but the efficiency of reaction lowers because protons need to move through a longer path via the end part of the cell
Solution Approach 1:
By arranging oxidation and reduction electrodes on the same surface in an interdigitated pattern rather than positioning them on opposite surfaces, the patent creates multiple short proton transfer paths across the electrode interfaces. This eliminates the long proton migration path through the cell ends that plagues scaled-up integrated-type cells, maintaining high reaction efficiency at larger scales.
Solution Approach 2:
The interdigitated electrode configuration creates localized reaction zones where oxidation and reduction occur in close proximity on the same surface. This local arrangement ensures that proton transfer distances remain short throughout the entire electrode area, regardless of overall cell size, thereby maintaining reaction efficiency while enabling scalable operation.
3Length of moving object
If electrodes for oxidation and reduction reactions are disposed to face each other in facing-type cells, then the distance between electrodes can be short, but it is difficult to uniformly circulate sufficient electrolytic solution
Solution Approach 1:
The patent resolves this contradiction by moving both oxidation and reduction electrodes to the same surface in an interdigitated arrangement. This eliminates the need for facing-type configuration while maintaining short electrode-to-electrode distances for proton transfer. The same-surface configuration naturally provides adequate space for electrolytic solution circulation channels between and around the interdigitated electrode structures.
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
This configuration enhances current density and operating current, allowing for efficient proton flow and material supply, thereby improving the efficiency and scalability of artificial photosynthesis systems, even in larger cell sizes.
Implementation Method 1
amorphous silicon based triple-junction solar cell (a-Si 3J-SC)... III-V compound dual-junction solar cells (III-V 2J-SC)
Implementation Method 2
protons can smoothly flow from the electrode for oxidation reaction to the electrode for reduction reaction
Implementation Method 3
photoelectrodes having an oxidation-reduction catalyst supported thereon... oxidation catalyst function... reduction catalyst
Data Source
AI summary
An electrode set for chemical reaction includes a substrate, and electrodes for reduction and oxidation reactions alternately arranged on the same surface of the substrate.