CuO/SnO2–In2O3 sensor for monitoring CO concentration in a reducing atmosphere

CO-Sensing Properties of Diode-Type Gas Sensors Employing Anodized Titania and Noble-Metal Electrodes under Hydrogen Atmosphere

“…The solubility of hydrogen into Pt is extremely smaller than that into Pd [29], but H 2 molecules easily and largely adsorb on the Pt surface [30]. In addition, CO molecules are well known to strongly adsorb on the Pt surface [2][3][4][5][6][7][8][9][10][11][12][13][14][15], especially at around 100 • C (temperatures at which PEMFCs generally operate) under H 2 -based reducing atmospheres. Therefore, the strongly adsorbed CO species probably interrupted the dissociatively adsorption of H 2 molecules, to increase the work function of Pt and the height of Schottky barrier at the M/TiO 2 interface, and thus to decrease the magnitude of current.…”

“…Various types of gas sensors, such as chemiresistor-type sensors using oxides [2][3][4][5][6], polymers [7], or metal salts [8][9][10], electrochemical sensors [11][12][13], and solid-electrolyte sensors [14,15], have been developed to detect CO sensitively and selectively, under reducing atmosphere. However, none of the sensors have CO-sensing properties sufficient to quantify the concentration of residue CO left in the reformed gas.…”

Investigation on Reduction Behaviors of SnO2 and SnO2-Supported CuO Sensor Materials by Temperature-Programmed Reduction Method Combined with Resistance Measurement

“…CuO-doped SnO 2 has been reported to be one of the potential materials for CO (1)(2)(3) sensors. We have demonstrated that CuO-doped SnO 2 exhibited a response to the small amount of CO involving H 2 flow and that its response was related with the oxidation states of Cu and Sn.…”

“…We have demonstrated that CuO-doped SnO 2 exhibited a response to the small amount of CO involving H 2 flow and that its response was related with the oxidation states of Cu and Sn. (3) Therefore, the investigation of the reduction behavior of CuO-doped SnO 2 is significant for understanding the sensor mechanism.…”

“…TPR&R measurement was carried out by flowing 5 vol% H 2 + N 2 (50 cm 3 •min −1 ) in the temperature range of 50-450 °C at a heating rate of 2 °C•min −1 .…”