Enhancement in surface exchange coefficient and electrochemical performance of Sr2Fe1.5Mo0.5O6 electrodes by Ce0.8Sm0.2O1.9 nanoparticles

2011 ◽  
Vol 13 (7) ◽  
pp. 711-713 ◽  
Author(s):  
Lei Zhang ◽  
Yiqun Liu ◽  
Yanxiang Zhang ◽  
Guoliang Xiao ◽  
Fanglin Chen ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Exchange Coefficient ◽  
Surface Exchange ◽  
Surface Exchange Coefficient

A Study of the Oxygen Surface Exchange Coefficient on La0.5Sr0.5CoO3−δ Thin Films

1999 ◽  
Vol 606 ◽  
Author(s):  
X. Chen ◽  
S. Wang ◽  
Y.L. Yang ◽  
L. Smith ◽  
N.J. Wu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Initial Pressure ◽  
Transient Behavior ◽  
Epitaxial Thin Films ◽  
Exchange Coefficient ◽  
Surface Exchange ◽  
Surface Exchange Coefficient ◽  
Pressure Changes ◽  
Oxygen Surface Exchange

AbstractLa0.5Sr0.5CoO3−δ (LSCO) can be used as a cathode material for low temperature solid oxide fuel cell applications. LSCO epitaxial thin films have been deposited on LaAlO3 substrates by pulsed laser deposition (PLD). The transient behavior of the thin film conductivity with the pressure changes was recorded as a function of temperature and partial oxygen pressure. The surface exchange coefficient k of the LSCO thin film was obtained from analysis of the electrical conductivity relaxation data. The measured surface exchange coefficient increases with temperature and with final pressure but is not sensitive to the initial pressure. After prolonged annealing at 900°C, the k value was found to have greatly increased. The mechanism of the dependence of the measured k on pressure is discussed.

scholarly journals Back-exchange: a novel approach to quantifying oxygen diffusion and surface exchange in ambient atmospheres

2017 ◽  
Vol 19 (19) ◽  
pp. 12199-12205 ◽  
Author(s):  
Samuel J. Cooper ◽  
Mathew Niania ◽  
Franca Hoffmann ◽  
John A. Kilner
Keyword(s):  
Isotopic Exchange ◽  
Ambient Air ◽  
Exchange Coefficient ◽  
Effective Surface ◽  
Surface Exchange ◽  
Electronic Conductor ◽  
Novel Approach ◽  
Mixed Ionic Electronic Conductor ◽  
Back Exchange ◽  
Surface Exchange Coefficient

A novel two-step Isotopic Exchange (IE) technique has been developed to investigate the influence of oxygen containing components of ambient air (such as H2O and CO2) on the effective surface exchange coefficient (k*) of a common mixed ionic electronic conductor material.

Oxygen diffusion and surface exchange in the mixed conducting oxides SrTi1−yFeyO3−δ

2016 ◽  
Vol 18 (42) ◽  
pp. 29495-29505 ◽  
Author(s):  
Veronika Metlenko ◽  
WooChul Jung ◽  
Sean R. Bishop ◽  
Harry L. Tuller ◽  
Roger A. De Souza
Keyword(s):  
Oxygen Diffusion ◽  
Oxygen Exchange ◽  
Exchange Coefficient ◽  
Surface Exchange ◽  
Conducting Oxides ◽  
Single Mechanism ◽  
Surface Exchange Coefficient

Variation of the surface exchange coefficient with Fe concentration suggests single mechanism of oxygen exchange for e−-poor and e−-rich SrTi1−yFeyO3−δ oxides.

scholarly journals Oxygen exchange at gas/oxide interfaces: how the apparent activation energy of the surface exchange coefficient depends on the kinetic regime

2016 ◽  
Vol 18 (32) ◽  
pp. 22031-22038 ◽  
Author(s):  
Peter Fielitz ◽  
Günter Borchardt
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Oxygen Exchange ◽  
Oxide Surfaces ◽  
Kinetic Regime ◽  
Exchange Coefficient ◽  
Surface Exchange ◽  
Oxide Interfaces ◽  
Surface Exchange Coefficient ◽  
Apparent Activation Energies

The model explains the range of apparent activation energies measured in different kinetic regimes of oxygen exchange at oxide surfaces.

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