Micro-Protrusion Hydrogen Sensor Coating to Prevent Icing
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Solution Overview
Problem
Catalytic combustion type hydrogen sensors face issues with icing due to water generation from hydrogen reactions, leading to degraded sensitivity and performance, and require high power consumption for maintaining high-temperature environments, while non-uniform catalyst application affects sensitivity and performance.
Innovation Solution
A catalytic combustion type hydrogen sensor with a silicon substrate, a protective thin film, a heater, and a catalyst layer, featuring an anti-icing film with micro-protrusions to prevent water freezing and a uniform catalyst layer with increased surface area, improving sensitivity and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catalytic combustion type hydrogen sensor is used to detect hydrogen leakage, then safety is improved, but water generated from hydrogen reaction causes icing on the sensor surface which blocks contact of combustible gas and degrades sensitivity and performance
Solution Approach 1:
The invention introduces a micro-protrusion structure on the sensor surface that adds a third dimension to the otherwise flat surface. These micro-protrusions create hierarchical micro-nano structures that reduce water contact area and prevent ice formation, allowing the sensor to maintain sensitivity while ensuring safety through continuous hydrogen detection capability in low-temperature environments
Solution Approach 2:
The invention converts the harmful effect of water generation from hydrogen reaction into a beneficial anti-icing effect. By designing micro-protrusions that exploit the water generation phenomenon, the sensor surface creates conditions where water cannot form continuous ice layers, thus the very byproduct that causes degradation is transformed into a mechanism that prevents degradation
2Measurement precision
If a large amount of power is applied to maintain high-temperature environment for the sensing portion, then sensitivity is improved, but power consumption increases making constant driving based on battery impossible
Solution Approach 1:
The invention changes the operational temperature parameter by preventing ice formation through micro-protrusion structures. This allows the sensor to maintain high sensitivity at lower operating temperatures, reducing the power required to maintain the sensing environment and enabling battery-powered continuous operation while preserving detection capability
3Productivity
If a catalyst is applied in a dispensing type to increase the surface area of the catalyst, then performance is improved, but the catalyst is not applied uniformly due to large errors in connection with the amount of applied catalyst and the position
Solution Approach 1:
The invention employs a porous anodic aluminum oxide (AAO) membrane as the catalyst support structure. This porous material provides a highly uniform, three-dimensional network of pores that ensures consistent catalyst distribution across the entire surface area, achieving both high performance through increased surface area and high manufacturing precision through the inherent uniformity of the porous structure
4Measurement precision
If an additional heater is applied to prevent low-temperature icing, then sensitivity is maintained, but power consumption increases and causes the same problem of impossible constant driving
Solution Approach 1:
The invention extracts and eliminates the need for additional heating mechanisms by introducing micro-protrusion structures on the sensor surface. These structures passively prevent ice formation through their geometric design, removing the requirement for energy-consuming heaters while maintaining sensor sensitivity in low-temperature environments
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 sensor effectively prevents water freezing and enhances catalyst layer uniformity, thereby improving sensitivity and performance without additional power consumption.
Implementation Method 1
the metal wire (sensing portion) is heated to a specific temperature by applying an electric current thereto
Implementation Method 2
oxidation of the combustible gas causes catalytic combustion and results in reaction heat
Implementation Method 3
combustible gas contacts the surface of the oxidation catalyst after the metal wire (sensing portion) is heated to a specific temperature
Implementation Method 4
an anti-icing film which is formed on the upper surface of the protective thin film to cover and thus insulate the heater and has micro-protrusions formed on the outer surface thereof to prevent freezing of generated water
Data Source
AI summary
An embodiment catalytic combustion type hydrogen sensor includes a protective thin film disposed on an upper surface of a silicon substrate, the protective thin film including an oxide film and a nitride film sequentially laminated, a heater coupled to an upper surface of the nitride film, an anti-icing film disposed on an upper surface of the protective thin film and covering the heater, the anti-icing film including micro-protrusions disposed on an outer surface thereof, and a catalyst layer deposited on an upper surface of the anti-icing film and coated along surfaces of the micro-protrusions of the anti-icing film, wherein the catalyst layer is configured to be heated by the heater to perform a hydrogen reaction for oxidizing hydrogen and to coat the surfaces of the micro-protrusions to prevent water generated through the hydrogen reaction from freezing.