Hydrogen Sensor Catalyst Surface Area via Porous Insulator
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Solution Overview
Problem
Conventional catalytic combustion type hydrogen sensors have a structural limitation in increasing the surface area of the catalyst part, which restricts the improvement of hydrogen sensing performance.
Innovation Solution
The hydrogen sensor is designed with a substrate, an insulating part with multiple holes, a first catalyst part on the upper end of the insulating part, a second catalyst part on the surface of the holes, and a heater part inside the insulating part to enhance the reaction between hydrogen and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the catalyst part is formed as a single layer on the substrate, then the manufacturing process is simple, but the surface area of the catalyst part is limited
Solution Approach 1:
The catalyst part transitions from a two-dimensional single layer on the substrate to a three-dimensional structure by forming holes through the insulating part and depositing catalyst material on the inner surfaces of these holes. This dimensional transition significantly increases the surface area available for catalytic reaction while maintaining a compact structure suitable for sensor applications.
Solution Approach 2:
The insulating part is designed with multiple holes creating a porous structure that allows hydrogen and oxygen to access the catalyst material deposited on the inner surfaces. This porous configuration maximizes the exposed surface area of the catalyst part, enabling more reaction sites for hydrogen oxidation while maintaining structural integrity.
2Measurement precision
If the surface area of the catalyst part is increased to improve reaction rate, then hydrogen sensing performance is improved, but the structural limitation of single-layer formation prevents further area increase
Solution Approach 1:
The catalyst structure extends into the third dimension by utilizing the inner surfaces of holes formed in the insulating part. This allows the catalyst material to be deposited on vertically oriented surfaces rather than only on the horizontal substrate plane, dramatically increasing the effective surface area for hydrogen sensing reactions.
Solution Approach 2:
The catalyst part is segmented into multiple discrete regions by forming multiple holes in the insulating part. Each hole creates additional catalyst surface area, and the collective effect of multiple segmented catalyst regions provides a significantly larger total surface area compared to a continuous single-layer catalyst film.
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 increased surface area of the catalyst parts improves the hydrogen sensing performance by maximizing the reaction area between hydrogen and oxygen, thereby enhancing the detection capabilities of the sensor.
Implementation Method 1
a heater part disposed inside the insulating part to heat the first catalyst part and the second catalyst part
Implementation Method 2
a first catalyst part formed on an upper end of the insulating part to accelerate the reaction between hydrogen and oxygen, a second catalyst part formed on a surface each of the plurality of holes to accelerate the reaction between hydrogen and oxygen
Implementation Method 3
a catalytic combustion type hydrogen sensor converts the reaction heat generated when hydrogen and oxygen react into an electric signal
Implementation Method 4
an insulating part formed on the substrate and comprising a plurality of holes, a first catalyst part formed on an upper end of the insulating part, a second catalyst part formed on a surface each of the plurality of holes
Data Source
AI summary
A hydrogen sensor includes a substrate, an insulating part formed on the substrate and provided with a plurality of holes, a first catalyst part formed on an upper end of the insulating part to accelerate the reaction between hydrogen and oxygen, a second catalyst part formed on a surface of the holes to accelerate the reaction between hydrogen and oxygen, and a heater part disposed inside the insulating part to heat the first catalyst part and the second catalyst part, and having an temperature increased by reaction heat generated by the reaction between hydrogen and oxygen.