Amorphous ITO Functional Layer for Hydrogen Generation Electrode Durability
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Solution Overview
Problem
The existing solar battery integral gas producing apparatus faces durability issues due to bubble formation when the photoelectric conversion part with a pn junction is immersed in an electrolytic aqueous solution for extended periods, leading to degradation.
Innovation Solution
A hydrogen generation electrode with a conductive layer, an inorganic semiconductor layer having a pn junction, and a functional layer made of amorphous ITO with a steam permeability of 5 g/(m2·day) or less, which covers the inorganic semiconductor layer and is in contact with the electrolytic aqueous solution, preventing moisture ingress and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photoelectric conversion part with pn junction is immersed in electrolytic aqueous solution for extended periods, then hydrogen generation function is achieved, but bubbles form inside the photoelectric conversion part causing destruction and durability degradation
Solution Approach 1:
A functional layer made of amorphous ITO is introduced as an intermediary between the inorganic semiconductor layer and the electrolytic aqueous solution. This functional layer prevents direct contact between the semiconductor and the electrolyte, thereby preventing bubble formation inside the photoelectric conversion part while still allowing hydrogen generation to occur. The layer acts as a protective mediator that resolves the contradiction between achieving hydrogen generation and preventing durability degradation.
Solution Approach 2:
A thin functional layer of amorphous ITO is applied to cover the inorganic semiconductor layer. This thin film serves as a protective barrier that prevents bubbles from forming inside the photoelectric conversion part during prolonged immersion in the electrolytic solution, thereby maintaining the structural integrity and durability of the device while preserving its hydrogen generation functionality.
2Reliability
If the photoelectric conversion part is covered to prevent bubble formation, then durability is improved, but light reception efficiency may be affected
Solution Approach 1:
A thin functional layer of amorphous ITO is used to cover the inorganic semiconductor layer. This thin film is sufficiently transparent to allow light to pass through and reach the semiconductor layer for photoelectric conversion, while simultaneously providing protection against bubble formation. The thinness of the film ensures minimal impact on light reception efficiency while achieving the protective function.
Solution Approach 2:
The functional layer is made of amorphous ITO, which has optical properties that allow it to be transparent or translucent in the visible spectrum. This enables the layer to protect the semiconductor from bubble formation while still permitting light to pass through effectively for photoelectric conversion, thus maintaining high light reception 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 solution provides a hydrogen generation electrode with enhanced durability, preventing bubble formation and maintaining performance over time, even when immersed in the electrolytic aqueous solution.
Implementation Method 1
a steam permeability of the functional layer is 5 g/(m2·day) or less
Implementation Method 2
devices that use a photoelectric conversion material used for solar batteries and decompose an electrolytic aqueous solution to produce oxygen and hydrogen utilizing an electromotive force obtained with this photoelectric conversion material
Data Source
AI summary
A hydrogen generation electrode is used for an artificial photosynthesis module that decomposes an electrolytic aqueous solution into hydrogen and oxygen with light. The hydrogen generation electrode has a conductive layer, an inorganic semiconductor layer that is provided on the conductive layer and has a pn junction, and a functional layer that covers an inorganic semiconductor layer. The steam permeability of the functional layer is 5 g/(m2·day) or less.