ChemInform Abstract: Proton Uptake in the H+-SOFC Cathode Material Ba0.5Sr0.5Fe0.8Zn0.2O3-δ: Transition from Hydration to Hydrogenation with Increasing Oxygen Partial Pressure

ChemInform ◽  
2016 ◽  
Vol 47 (4) ◽  
pp. no-no
Author(s):  
Daniel Poetzsch ◽  
Rotraut Merkle ◽  
Joachim Maier
Keyword(s):  
Oxygen Partial Pressure ◽  
Cathode Material ◽  
Partial Pressure ◽  
Sofc Cathode ◽  
Proton Uptake

Proton uptake in the H+-SOFC cathode material Ba0.5Sr0.5Fe0.8Zn0.2O3−δ: transition from hydration to hydrogenation with increasing oxygen partial pressure

2015 ◽  
Vol 182 ◽  
pp. 129-143 ◽  
Author(s):  
Daniel Poetzsch ◽  
Rotraut Merkle ◽  
Joachim Maier
Keyword(s):  
Diffusion Coefficient ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Effective Diffusion ◽  
Hydrogen Uptake ◽  
Protonic Conductivity ◽  
Acid Base ◽  
Sofc Cathode ◽  
Proton Uptake ◽  
Thermogravimetric Investigations

Thermogravimetric investigations on the perovskite Ba0.5Sr0.5Fe0.8Zn0.2O3−δ (BSFZ, with mixed hole, oxygen vacancy and proton conductivity) from water vapor can occur by acid–base reaction (hydration) or redox reaction (hydrogen uptake), depending on the oxygen partial pressure, i.e. on the material's defect concentrations. In parallel, the effective diffusion coefficient of the stoichiometry relaxation kinetics also changes. These striking observations can be rationalized in terms of a defect chemical model and transport equations for materials with three mobile carriers. Implications for the search of cathode materials with mixed electronic and protonic conductivity for application on proton conducting oxide electrolytes are discussed.

scholarly journals Structure and reactivity with oxygen of Pr2NiO4+δ: an in situ synchrotron X-ray powder diffraction study

2016 ◽  
Vol 45 (7) ◽  
pp. 3024-3033 ◽  
Author(s):  
Thibault Broux ◽  
Carmelo Prestipino ◽  
Mona Bahout ◽  
Serge Paofai ◽  
Erik Elkaïm ◽  
...  
Keyword(s):  
High Temperature ◽  
Cathode Material ◽  
Partial Pressure ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Temperature Behaviour ◽  
Sofc Cathode ◽  
X Ray

The high temperature behaviour of the SOFC cathode material Pr2NiO4.22 was revisited in situ as function of O2 partial pressure.

scholarly journals Effect of Hot-Dip Galvanizing Process on Selective Oxidation and Galvanizability of Medium Manganese Steel for Automotive Application

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1265
Author(s):  
Zhang Chen ◽  
Yanlin He ◽  
Weisen Zheng ◽  
Hua Wang ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Surface Oxidation ◽  
Steel Sample ◽  
Dew Point ◽  
Manganese Steel ◽  
Automotive Application ◽  
Stable Phase ◽  
Annealing Atmosphere ◽  
Medium Manganese Steel

A medium manganese steel with 7.5 wt.% Mn for automobile application was galvanized in a continuous Hot Dip Galvanizing (HDG) simulator under different galvanizing conditions. It was shown that the effects of dew point, annealing temperature and annealing atmosphere on the surface oxidation of steel could be comprehensively evaluated by the consideration of oxygen partial pressure P(O2). Although Mn2SiO4 was a thermodynamic stable phase when P(O2) varied from 10−28 to 10−21 atm, it was difficult to form Mn–Si–O composite oxide because there was no enrichment of silicon on the steel surface. So, this oxide was generally formed in the Fe substrate and had little effect on the galvanizability. With the increase in P(O2) above 10−25 atm, MnO particles in the form of the thermodynamic stable phase became coarser and tended to aggregate, which hindered the formation of a continuous inhibition layer, resulting in the defects of bare spots on the galvanized surface of the steel. When the oxygen partial pressure greater than 10−22 atm, film-like MnO layer was formed on the surface of steel sample, which obviously deteriorated the galvanizability. The galvanizability of the steel can be improved by the regulation of oxygen partial pressure; based on this, the reasonable zinc plating process parameters can be developed.

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