Oxygen exchange on nanocrystalline tin dioxide modified by palladium

Frolov, Dmitry D.; Kotovshchikov, Yury N.; Morozov, Igor; Болталин, А. И.; Fedorova, Anna; Marikutsa, Artem; Rumyantseva, M. N.; Gaskov, Alexander; Sadovskaya, E. M.; Abakumov, Artem M.

doi:10.1016/j.jssc.2011.11.028

Cited by 40 publications

(38 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The washed SnO2· nH2O deposit was dried at 50 °C overnight and annealed in air at 300 °C for 24 h. Chemical modification of nanocrystalline tin dioxide by 1 wt.% of PdOx or RuOy was performed via the impregnation of as-obtained SnO2 powder by ethanol solution of noble metal acetylacetonate precursors. The impregnated samples, SnO2/Pd(acac)2 and SnO2/Ru(acac)3, were calcined at 225 °C and 265 °C , respectively, to decompose the modifier precursors at a sufficiently lower temperature [25,26].…”

Section: Methodsmentioning

confidence: 99%

“…The micrographs of the nanocomposites were obtained using high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) analysis with a Tecnai G2 transmission electron microscope operated at 200 kV. Characterization of the samples by X-ray diffraction (XRD), electron diffraction (ED), X-ray absorption spectroscopy (XANES and EXAFS), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) were described in our previous publications [23][24][25][26][27]. The composition and microstructure parameters of the samples are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

View full text Add to dashboard Cite

This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

View full text Add to dashboard Cite

show abstract

“…Oxygen isotope exchange with gas-phase analysis can provide greater experimental parameter flexibility, as well as in-situ determination of intermediate species. In this study, we use temperature programmed isotope exchange (TPX) [25][26][27][28][29][30][31][32] to probe the exchange behavior between water and the cathode surface as a function of temperature, PO 2 , and water vapor concentration. To further focus on the exchange between the contaminant and the cathode surface, an experiment called isotope saturated temperature programmed exchange (ISTPX) was designed.…”

Section: -6mentioning

confidence: 99%

Fundamental Impact of Humidity on SOFC Cathode ORR

Huang

Pellegrinelli

Wachsman

2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

Although solid oxide fuel cells (SOFC) have demonstrated excellent performance, the durability of SOFCs under real working conditions is still an issue for commercial deployment. In particular cathode exposure to atmospheric air contaminants, such as humidity, can result in long-term performance degradation issues. Therefore, a fundamental understanding of the interaction between water molecules and cathodes is essential to resolve this issue and further enhance cathode durability. To study the effects of humidity on the oxygen reduction reaction (ORR), we used in-situ 18 O isotope exchange techniques to probe the exchange of water with two of the most common SOFC cathode materials, (La 0.8 Sr 0.2 ) 0.95 MnO 3±δ (LSM) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF). In this experiment, heavy water, D 2 O (with a mass/charge ratio of m/z = 20), is used to avoid the overlapping of H 2 O and the 18 O 2 cracking fraction, which both provide a peak at m/z = 18. A series of temperature programmed isotope exchange measurements were performed to comprehensively study the interaction of water with the cathode surface as a function of temperature, oxygen partial pressure, and water vapor concentration. The results suggest that water and O 2 share the same surface exchange sites, leading to competitive adsorption. Our findings show that water prefers to exchange with LSCF at lower temperatures, around 300-450 • C. For LSM, O 2 is more favorable than water to be adsorbed on the surface and the presence of O 2 limits water exchange. The experimental data are summarized in a Temperature-PO 2 diagram to help visualize how the exchange of water on each material depends on the operating conditions. © The Author Solid oxide fuel cells (SOFC) electrochemically oxidize fuels for the generation of electricity. Two key advantages of SOFCs are their high efficiency and ability to utilize conventional fuels. This fuel flexibility stems from the dissociation and transport of oxygen from the cathode through the electrolyte to the anode, where the fuels are oxidized. Unfortunately, cathode degradation under real working conditions is a factor that limits SOFC performance. 1-6The long term durability of these materials is a major challenge, due to the high temperature required for the thermally activated oxygen reduction reaction (ORR), 7 as well as the variety of gases present during operation. 8,9 The impurities present in air on the cathode side of the cell can induce undesirable reactions. Some of these impurities, such as Cr or silica, 10-15 arise due to the interconnect and seal materials while some are intrinsic to ambient air, such as humidity and CO 2 . 16 Humidity has been found to degrade the performance of (La 0.8 Sr 0.2 ) 0.95 MnO 3±δ (LSM) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) based cells. 11,[17][18][19][20][21][22][23][24] This degradation can be either reversible or irreversible. 21 However, there is no conclusive evidence showing, fundamentally, how water participates in the degradation process, and it is hard to quan...

show abstract

“…For example, adjust structure defects or fabricate composite structure, including decorating noble palladium, platinum, aurum, silver (Ag) nanoparticles on the surface of metal-oxide semiconductor [30][31][32][33] . These factors can be changed gas sensing performance, such as sensitivity of detecting gas, force on the detection of target gas, decreasing detection response/recovery times and power consumption for sensor operating temperature 34,35 . Hsueh et al reported that Pt modified ZnO NWs-based ammonia sensors exhibited a better response than pure ZnO NWs 36 .…”

Section: Introductionmentioning

confidence: 99%

High selectivity to ethanol gas sensor based on ZnO nanosheets decorated with Ag nanoparticles by aqueous solution and photochemical deposition

Young¹,

Liu²

2020

Preprint

View full text Add to dashboard Cite

We demonstrated the fabrication of Ag NPs decorated ZnO NSs on a glass substrate using the aqueous solution and photochemical deposition method. The synthesis process is room temperature. This two-dimensional ZnO NSs can increase the performance of gas sensors due to increase the surface-to-volume ratio. Through increasing the surface-to-volume ratio of nanostructures, it is possible to increase the absorption potion of the target gas. In addition, noble metal NPs attached to the ZnO nanostructure can also increase the performance of gas sensors because Ag NPs act as strong electron acceptors, it will be induced enhanced electron depletion layer. As a result, the Ag NPs decorated ZnO NSs gas sensor has high selectivity to ethanol, as well as improved gas sensing performance to ethanol as compared to ZnO.

show abstract

Oxygen exchange on nanocrystalline tin dioxide modified by palladium

Cited by 40 publications

References 22 publications

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Fundamental Impact of Humidity on SOFC Cathode ORR

High selectivity to ethanol gas sensor based on ZnO nanosheets decorated with Ag nanoparticles by aqueous solution and photochemical deposition

Contact Info

Product

Resources

About