Catalytic Methane Sensor Using a Ni-CaZr[sub 0.9]In[sub 0.1]O[sub 3−α] Cermet Electrode

Abstract

A catalytic asymmetrical Nernst-type methane sensor with a porous Ni-CaZr 0.9 In 0.1 O 3Ϫ␣ Cermet electrode has been developed. At 600 and 700ЊC a Nernst-like behavior of the sensor is observed as a function of the methane partial pressure with a slope of 56 and 26 mV/decade, respectively. At 500ЊC a deviation from this behavior is found. The temperature dependence of the sensor response can be explained by the difference in catalytic activity of nickel and platinum. The sensor response depends on the CO 2 concentration, but it is shown that the measured electromotive force can be corrected for the CO 2 concentration in the gas mixture. The presence of water in the gas mixture leads to a decrease of the sensitivity, which can be explained by the different catalytic response of nickel and platinum to the presence of water. The sensor shows good reproducibility and long-term stability. The effect of the gas flow rate on the sensor performance is found to be minimal.

Combined Mixed Potential Electrochemical Sensors and Artificial Neural Networks for the Quantificationand Identification of Methane in Natural Gas Emissions Monitoring

“…33 Recently, much research has been focused on mixed solid-state gas sensors. [34][35][36][37][38][39][40][41][42][43] Of these, mixed potential electrochemical sensors (MPES) are well suited to natural gas leak detection in that they have been shown to be capable of detecting methane, ammonia and heavier hydrocarbons. 44,45 The sensing mechanism has been described in detail by Muira et.…”

A Solid Oxide Fuel Cell with a Novel Geometry That Eliminates the Need for Preparing a Thin Electrolyte Film

“…[5][6][7][8][9][10][11][12] We have recently succeeded in applying this single-chamber device to a SOFC constructed from a Sm 3ϩ -doped ceria ͑SDC͒ electrolyte with a SDC-Ni anode and a perovskite cathode, although the two electrodes were attached to opposite surfaces of the electrolyte. 13 Based on this result, it could be extrapolated that if the two electrodes were placed on the same surface of the electrolyte in a mixture of fuel and air, one would fabricate exactly the SOFC intended above.…”

“…Many researchers have proposed a type of potentiometric device with only one gas chamber, where the anode and the cathode are exposed to the same mixture of reducing gas ͑hydrogen, carbon monoxide, or hydrocarbons͒ and oxidizing gas ͑oxygen, water vapor, or carbon dioxide͒. [5][6][7][8][9][10][11][12] We have recently succeeded in applying this single-chamber device to a SOFC constructed from a Sm 3ϩ -doped ceria ͑SDC͒ electrolyte with a SDC-Ni anode and a perovskite cathode, although the two electrodes were attached to opposite surfaces of the electrolyte. 13 Based on this result, it could be extrapolated that if the two electrodes were placed on the same surface of the electrolyte in a mixture of fuel and air, one would fabricate exactly the SOFC intended above.…”

Methane detection using Pt-gated AlGaN/GaN high electron mobility transistor based Schottky diodes

“…Optical based sensors monitor the changes of refractive index or transmission spectra of the sensing materials upon absorbing the methane gas molecules. [12][13][14] For electronic based sensors, ZnO, 15 In 2 O 3 , 16 or SnO 2 (Ref. 17) are typically used for sensing methane by measuring the conductance of the oxides.…”