scholarly journals Oxygen exchange kinetics on systematically doped ceria: a pulsed isotope exchange study

2019 ◽  
Vol 7 (38) ◽  
pp. 21854-21866 ◽  
Author(s):  
Maximilian Schaube ◽  
Rotraut Merkle ◽  
Joachim Maier
Keyword(s):  
Exchange Rate ◽  
Isotope Exchange ◽  
Dopant Concentration ◽  
Strong Dependence ◽  
Oxygen Exchange ◽  
Doped Ceria ◽  
Exchange Study ◽  
Redox Active ◽  
Exchange Kinetics

20 systematically doped ceria samples: strong dependence of oxygen exchange rate on dopant concentration, even steeper for redox-active dopants (Pr).

Fast oxygen exchange kinetics of pore-free Bi1−xSrxFeO3−δ thin films

2011 ◽  
Vol 13 (37) ◽  
pp. 16530 ◽  
Author(s):  
Anja Wedig ◽  
Rotraut Merkle ◽  
Benjamin Stuhlhofer ◽  
Hanns-Ulrich Habermeier ◽  
Joachim Maier ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Exchange ◽  
Exchange Kinetics ◽  
Kinetics Of

scholarly journals MoS2 pixel arrays for real-time photoluminescence imaging of redox molecules

2019 ◽  
Vol 5 (11) ◽  
pp. eaat9476 ◽  
Author(s):  
M. F. Reynolds ◽  
M. H. D. Guimarães ◽  
H. Gao ◽  
K. Kang ◽  
A. J. Cortese ◽  
...  
Keyword(s):  
New Technologies ◽  
Chemical Potential ◽  
Strong Dependence ◽  
Detection Methods ◽  
Redox Active ◽  
New Strategy ◽  
Chemical And Biological Systems ◽  
Redox Molecules ◽  
Fluorescent Molecules ◽  
Molecule Concentration

Measuring the behavior of redox-active molecules in space and time is crucial for understanding chemical and biological systems and for developing new technologies. Optical schemes are noninvasive and scalable, but usually have a slow response compared to electrical detection methods. Furthermore, many fluorescent molecules for redox detection degrade in brightness over long exposure times. Here, we show that the photoluminescence of “pixel” arrays of monolayer MoS2 can image spatial and temporal changes in redox molecule concentration. Because of the strong dependence of MoS2 photoluminescence on doping, changes in the local chemical potential substantially modulate the photoluminescence of MoS2, with a sensitivity of 0.9 mV/Hz on a 5 μm × 5 μm pixel, corresponding to better than parts-per-hundred changes in redox molecule concentration down to nanomolar concentrations at 100-ms frame rates. This provides a new strategy for visualizing chemical reactions and biomolecules with a two-dimensional material screen.

Tailoring the surface of perovskite oxide for enhanced oxygen exchange kinetics

2016 ◽  
Author(s):  
Saim Saher ◽  
Shafi ur Rehman ◽  
Abdul Basit ◽  
Muhammad Noman ◽  
Muhammad Alam Zaib ◽  
...  
Keyword(s):  
Oxygen Exchange ◽  
Perovskite Oxide ◽  
Exchange Kinetics

Isotope Exchange of Gaseous Oxygen with Oxide LaMno3+δ Nanograins Boundary

2010 ◽  
Vol 297-301 ◽  
pp. 1301-1305
Author(s):  
Anatoly Yakovlevich Fishman ◽  
Tatiana Eugenievna Kurennykh ◽  
Vladimir Borisovich Vykhodets ◽  
V.B. Vykhodets
Keyword(s):  
Activation Energy ◽  
Exchange Rate ◽  
Isotope Exchange ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Gaseous Oxygen ◽  
Exponential Factor ◽  
Significant Difference ◽  
Exponential Factors ◽  
Arrhenius Expression

Isotope exchange of oxygen 18О2 with the boundary of nanograins of oxide LaMnO3+ obtained by the method of shock-wave loading was investigated in the temperature range of 400 – 500 °C. It was established that the temperature dependence of the isotope exchange rate is described by the Arrhenius expression, the activation energy and the pre-exponential factor being 1.67 eV and 1.8∙102 cm/s, respectively. Comparison with literature data has shown that for oxide LaMnO3+, a significant difference in activation energies and pre-exponential factors is observed for the isotope exchange rate with a ‘defect-free’ surface and the nanograin boundary. In case of the boundary, these parameters were higher: the activation energy about two times, and the pre-exponential factor, by almost 7 orders of magnitude.

Effect of grain boundaries in La0.84Sr0.16CoO3−δ on oxygen diffusivity and surface exchange kinetics

2021 ◽  
Author(s):  
Natalia Porotnikova ◽  
Andrei Farlenkov ◽  
Sergey Naumov ◽  
Maxim Vlasov ◽  
Anna Khodimchuk ◽  
...  
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Gas Phase ◽  
Oxygen Exchange ◽  
Polycrystalline Specimen ◽  
Surface Exchange ◽  
Oxygen Diffusivity ◽  
Exchange Kinetics ◽  
Oriented Single Crystal

The 16O/18O oxygen exchange kinetics between the gas phase and the oriented single crystal and polycrystalline specimen has been studied; the rates of individual stages of oxygen exchange have been calculated and discussed.

Segregated Chemistry and Structure on (001) and (100) Surfaces of (La1–xSrx)2CoO4 Override the Crystal Anisotropy in Oxygen Exchange Kinetics

2015 ◽  
Vol 27 (15) ◽  
pp. 5436-5450 ◽  
Author(s):  
Yan Chen ◽  
Helena Téllez ◽  
Mónica Burriel ◽  
Fan Yang ◽  
Nikolai Tsvetkov ◽  
...  
Keyword(s):  
Oxygen Exchange ◽  
Crystal Anisotropy ◽  
Exchange Kinetics
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