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Sensors 2014, 14(5), 8350-8362; doi:10.3390/s140508350

Calorimetric Thermoelectric Gas Sensor for the Detection of Hydrogen, Methane and Mixed Gases

National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 4638560, Japan
Author to whom correspondence should be addressed.
Received: 11 March 2014 / Revised: 14 April 2014 / Accepted: 29 April 2014 / Published: 9 May 2014
(This article belongs to the Section Chemical Sensors)
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A novel miniaturized calorimeter-type sensor device with a dual-catalyst structure was fabricated by integrating different catalysts on the hot (Pd/θ-Al2O3) and cold (Pt/α-Al2O3) ends of the device. The device comprises a calorimeter with a thermoelectric gas sensor (calorimetric-TGS), combining catalytic combustion and thermoelectric technologies. Its response for a model fuel gas of hydrogen and methane was investigated with various combustor catalyst compositions. The calorimetric-TGS devices detected H2, CH4, and a mixture of the two with concentrations ranging between 200 and 2000 ppm at temperatures of 100–400 °C, in terms of the calorie content of the gases. It was necessary to reduce the much higher response voltage of the TGS to H2 compared to CH4. We enhanced the H2 combustion on the cold side so that the temperature differences and response voltages to H2 were reduced. The device response to H2 combustion was reduced by 50% by controlling the Pt concentration in the Pt/α-Al2O3 catalyst on the cold side to 3 wt%.
Keywords: calorimeter; thermoelectric gas sensor; dual catalyst; methane; hydrogen calorimeter; thermoelectric gas sensor; dual catalyst; methane; hydrogen
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Park, N.-H.; Akamatsu, T.; Itoh, T.; Izu, N.; Shin, W. Calorimetric Thermoelectric Gas Sensor for the Detection of Hydrogen, Methane and Mixed Gases. Sensors 2014, 14, 8350-8362.

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