Thermally activated redox-processes in V2O5-x under high oxygen partial pressures investigated by means of impedance spectroscopy and Rutherford backscattering
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Manuel Harth
Electrochemical methods have been applied in the catalytic system V2O5 in order to investigate the redox properties and their correlation with catalytic properties. Temperature programmed conductivity measurements using electrochemical impedance spectroscopy enabled us to determine the onset of a thermally induced reduction at about 380°C. Rutherford backscattering analysis provides evidence for a reduction from V+5 to V+4. Experiments under different oxygen partial pressures showed that the vanadyl oxygen is involved in the reduction process and it was possible to determine the energy of formation for an oxygen vacancy as 1.23 ± 0.03 eV. The removability of the vanadyl oxygen is assumed to be a key factor for the catalytic activity so that it can be characterized by macroscopic transport properties.
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© 2013, Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Contents
- Award/Preisverleihung
- The Werner-Köster-Preis 2012
- Original Contributions
- Effect of microstructure on the wear resistance of borided Fe–Cr alloys
- Microstructure evolution in pure aluminium processed by equal channel angular pressing at elevated temperature
- Interfacial reactions between SAC405 and SACNG lead-free solders with Au/Ni(P)/Cu substrate reflowed using the CO2 laser and hot-air methods
- Experimental determination of the phase relations of the Co–Pt–Dy system at 773 K
- Boron partitioning between SiO2–CaO–MgO slags and liquid silicon at controlled nitrogen potential
- Thermally activated redox-processes in V2O5-x under high oxygen partial pressures investigated by means of impedance spectroscopy and Rutherford backscattering
- Effect of aluminium addition on densification behaviour and microstructural features of P/M processed Cu–TiC composites
- Effect of ZrO2 impurity on promoting reactive sintering of ZrB2–SiC–ZrC composites
- Magnetic and electric properties of nanoparticles of Ni-substituted ferrites synthesized using a microwave refluxing process
- Optimisation of total roll power using genetic algorithms in a compact strip production plant
- Modeling the correlation between yield strength, chemical composition and ultimate tensile strength of X70 pipeline steels by means of gene expression programming
- DGM News
- DGM News
Articles in the same Issue
- Contents
- Contents
- Award/Preisverleihung
- The Werner-Köster-Preis 2012
- Original Contributions
- Effect of microstructure on the wear resistance of borided Fe–Cr alloys
- Microstructure evolution in pure aluminium processed by equal channel angular pressing at elevated temperature
- Interfacial reactions between SAC405 and SACNG lead-free solders with Au/Ni(P)/Cu substrate reflowed using the CO2 laser and hot-air methods
- Experimental determination of the phase relations of the Co–Pt–Dy system at 773 K
- Boron partitioning between SiO2–CaO–MgO slags and liquid silicon at controlled nitrogen potential
- Thermally activated redox-processes in V2O5-x under high oxygen partial pressures investigated by means of impedance spectroscopy and Rutherford backscattering
- Effect of aluminium addition on densification behaviour and microstructural features of P/M processed Cu–TiC composites
- Effect of ZrO2 impurity on promoting reactive sintering of ZrB2–SiC–ZrC composites
- Magnetic and electric properties of nanoparticles of Ni-substituted ferrites synthesized using a microwave refluxing process
- Optimisation of total roll power using genetic algorithms in a compact strip production plant
- Modeling the correlation between yield strength, chemical composition and ultimate tensile strength of X70 pipeline steels by means of gene expression programming
- DGM News
- DGM News
