Photo-electrochemical Cell Segmented Catalyst Layers
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Solution Overview
Problem
Conventional photo-electrochemical cells face a trade-off between efficiency and durability due to corrosion issues when exposed to electrolytic solutions, with semiconductor layers being prone to corrosion and efficiency being limited by wiring resistance and photocatalyst capabilities.
Innovation Solution
A photo-electrochemical cell design featuring a photoelectric conversion layer with a first and second electrode, a first catalyst layer with catalyst parts and a transparent dielectric part, and a second catalyst layer electrically connected to the second electrode, which prevents corrosion while maintaining high light transmission and efficiency by using a composite structure of conductive and catalyst parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive film is formed on the photoelectric conversion layer to prevent corrosion, then durability is improved, but resistance loss increases and efficiency decreases
Solution Approach 1:
The photoelectric conversion layer is divided into multiple segments (first photoelectric conversion layer and second photoelectric conversion layer) with catalyst layers positioned between them. This segmentation allows the system to achieve both corrosion protection and low resistance loss by distributing the functional layers strategically, eliminating the need for a continuous transparent conductive film that would cause resistance loss.
2Use of energy by moving object
If an island-shaped catalyst layer is used to allow light transmission, then light absorption is improved, but durability decreases due to exposed semiconductor surfaces
Solution Approach 1:
The catalyst layer is designed with spatially varying properties: it is formed in specific regions (first and second regions) on the light-receiving surface, with the first catalyst layer in the first region and the second catalyst layer in the second region. This local quality approach allows light to pass through non-catalyst areas while catalyst areas provide protection, resolving the contradiction between light absorption and durability.
3Reliability
If a thin film-shaped catalyst layer is used to prevent exposed surfaces, then durability is improved, but optical loss increases and efficiency decreases
Solution Approach 1:
The catalyst protection is segmented into discrete first and second catalyst layers positioned in specific regions rather than forming a continuous thin film. This segmentation reduces the total catalyst material needed and minimizes optical loss while still providing adequate protection against electrolyte corrosion in the critical regions where catalysts are positioned.
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 design enhances durability and efficiency by preventing corrosion and reducing resistance losses, allowing for larger cell sizes without compromising performance, achieving improved hydrogen production and prolonged endurance times.
Implementation Method 1
a photoelectric conversion layer using a semiconductor
Implementation Method 2
artificially produces a storable chemical energy source from solar energy by imitating photosynthesis of plants
Data Source
AI summary
A photo-electrochemical cell of an embodiment includes: a first electrode which has a transparent conductive film provided on a first surface of a photoelectric conversion layer; a first catalyst layer provided on the first electrode; a second electrode provided on a second surface of the photoelectric conversion layer; and a second catalyst layer provided on the second electrode. The first catalyst layer has a plurality of catalyst parts disposed on the first electrode and a transparent dielectric part disposed in a gap between the plurality of catalyst parts.