Microporous ceramic coated SnO2 sensors for hydrogen and carbon monoxide sensing in harsh reducing conditions

Prasad, Ravi Mohan; Gurlo, Aleksander; Riedel, Ralf; Hübner, Michael; Bârsan, Nicolae; Weimar, Udo

doi:10.1016/j.snb.2010.06.016

Cited by 48 publications

(30 citation statements)

References 26 publications

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“…[40] Previous works are limited to SiC, [41,42] Si 3 N 4 , [43] SiO 2 , [44] and SiBCN. [45,46] In this study, we address the mechanism of gas (He, H 2 , CO 2 , SF 6 ) transport through asymmetric amorphous microporous silicon oxycarbide (SiOC) membranes recently synthesized by our group. [47] 2.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

et al. 2015

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Polymer-derived amorphous silicon oxycarbide (SiOC) ceramics are designed for hydrogen separation at high temperatures. To form amorphous SiOC top-coating with the thickness of about 300 nm, tubular porous g-Al 2 O 3 /a-Al 2 O 3 substrates with gradient porosity are threefold coated by vinylfunctionalized polysiloxane and pyrolyzed at 700 C under argon. N 2 -physisorption measurement confirms formation of microporous material with a specific surface area of about 400 m 2 g -1 . Single gas permeance characterization of the SiOC membrane at 300 C reveals H 2 /CO 2 and H 2 /SF 6 ideal permselectivities of about 10 and 320, respectively. The experimental gas permeance data are modeled using solid-state diffusion (for He and H 2 ) and gas translational diffusion (for CO 2 and SF 6 ) mechanisms.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

et al. 2015

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“…Tin dioxide (SnO 2 ) has attracted attentions as the most common materials used in gas sensing [1], but also as transparent conductor [2], and as heterogeneous oxidation catalyst. Titanium dioxide (TiO 2 ) has also received considerable attention as photocatalyst [3], white pigment, electrodes in devices including dye-sensitized solar cells [4], and gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Rutile-Type TiO₂-SnO₂Solid Solution Nanoparticles by "Forced Co-Hydrolysis" under Hydrothermal Conditions

Hirano¹,

Kono

2011

IOP Conf. Ser.: Mater. Sci. Eng.

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“…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.…”

Section: Figurementioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

2018

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CO-sensing properties of diode-type sensors employing an anodized TiO 2 film and noble-metal (M) electrodes (M/TiO 2 sensor, M: Pd, Pt, and Pd-nPt, n: the amount of Pt (wt %) in the Pd-nPt electrode) were investigated at 50-250 • C in dry or wet H 2 . All the M/TiO 2 sensors showed nonlinear I-V characteristics as a diode device in air and N 2 , but the I-V characteristics of the sensors were actually linear in H 2 because of the negligible small height of Schottky barrier at their M/TiO 2 interface. The Pd/TiO 2 sensor showed no CO response in H 2 , but the Pt/TiO 2 and Pd-nPt/TiO 2 sensors responded to CO in H 2 . Among them, the Pd-64Pt/TiO 2 sensor showed the largest CO response at 100 • C in H 2 . The reason why the mixing of Pd with Pt was effective in improving the CO response is probably because of a decrease in the amount of dissolved hydrogen species, an increase in the amount of dissociatively adsorbed hydrogen species, and an increase in the amount of adsorbed CO species in CO balanced with H 2 by the mixing of Pt into Pd. The interference from moisture in the target gas on the CO response should be largely improved from a practical application perspective.

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Microporous ceramic coated SnO2 sensors for hydrogen and carbon monoxide sensing in harsh reducing conditions

Cited by 48 publications

References 26 publications

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

Synthesis of Rutile-Type TiO₂-SnO₂Solid Solution Nanoparticles by "Forced Co-Hydrolysis" under Hydrothermal Conditions

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

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Microporous ceramic coated SnO2 sensors for hydrogen and carbon monoxide sensing in harsh reducing conditions

Cited by 48 publications

References 26 publications

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

Synthesis of Rutile-Type TiO2-SnO2Solid Solution Nanoparticles by "Forced Co-Hydrolysis" under Hydrothermal Conditions

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

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Synthesis of Rutile-Type TiO₂-SnO₂Solid Solution Nanoparticles by "Forced Co-Hydrolysis" under Hydrothermal Conditions