Reaction kinetics of the Pt, O2(g)|c-ZrO2 system: precursor-mediated adsorption

Mitterdorfer, A; Gauckler, Ludwig J.

doi:10.1016/s0167-2738(98)00472-x

Cited by 120 publications

(163 citation statements)

References 32 publications

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“…The high frequency semicircle, labeled 'I' in the figure and modeled with circuit components R2 and CPE2, is ascribed to the electrolyte impedance. The low frequency semicircle, labeled 'II' and modeled with circuit components R4 and CPE4, is ascribed to the electrochemical processes at the electrodes [10,[27][28][29][30][31][32]. A third, minor feature, which overlaps the high frequency side of arc 'II' but is not immediately apparent in the figure, is believed to be due to current constriction near the TPB [33].…”

Section: Experimentationmentioning

confidence: 99%

“…Unlike porous electrodes in conventional SOFC designs, such microelectrodes enable systematic investigations of electrochemical processes at the TPB, as demonstrated for a number of materials systems [21][22][23][24][25][26]. In this study, platinum was used as a model system because it is a classic, well-studied electrode with simple chemistry and low oxygen diffusivity such that oxygen incorporation is confined to the TPB at the electrode perimeter [10,25,[27][28][29][30]. In addition, Pt is of interest as a micro-SOFC electrode component because it is an excellent catalyst for redox reactions, is stable in both oxidizing and reducing environments, and-for the amount used per micro-device-not likely to be a challenging cost issue [5].…”

Section: Introductionmentioning

confidence: 99%

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Highly enhanced electrochemical performance of silicon-free platinum–yttria stabilized zirconia interfaces

2008

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In the drive to achieve economically viable solid oxide fuel cells, efforts have been directed towards substantially decreasing their operating temperature. Unfortunately, these efforts have been hindered by extremely sluggish electrode kinetics at reduced temperatures. In this report, we show that silicon impurities on the surface of the electrolyte play a critical role in influencing electrode kinetics. More specifically, improvements by as much as three orders of magnitude are reported for the performance of platinum electrodes on yttria-stabilized zirconia electrolytes prepared as high purity thin films with a largely Sifree surface. These improvements in performance are estimated to enable operation of a solid oxide fuel cell down to approximately 400°C.

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Section: Experimentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly enhanced electrochemical performance of silicon-free platinum–yttria stabilized zirconia interfaces

2008

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“…Out of a variety of metals and composite materials employed as electrode, platinum has always been of particular interest due to its electrocatalytic properties. In fact, the Pt/YSZ system is the most widely studied example of catalyst electrodes deposited on YSZ [6][7][8][9][10][11][12][13][14]. Nevertheless, numerous aspects of the electrochemical reactions occurring in an O 2(g) ,Pt/YSZ system are still under discussion due to the complexity of the system.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure on the electrochemical behavior of Pt/YSZ electrodes

et al. 2007

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Two types of O 2 ,Pt/YSZ electrode preparation (Pt/YSZ cermet and sputtered platinum film) have been characterized by SEM and by cyclic voltammetry and chronoamperometry at 450°C in 20 kPa oxygen. Cyclic voltammetry on the cermet and on the as-sputtered non-porous film electrode evidenced the characteristics of the PtO x /Pt couple. The corresponding redox reaction occurs at the metal/electrolyte interface and it manifests itself by an anodic wave and one of more cathodic peaks in the voltammogram. Heat treatment of the sputtered electrode at 700°C in oxygen atmosphere resulted in a porous structure by coalescence of the film. Cyclic voltammetry of the porous film electrode featured the characteristics of the O 2 /O 2) couple, i.e. the redox reaction of gaseous oxygen occurring at the tpb. Chronoamperometry at anodic potentials showed similar features for both electrode preparations: an initial inhibition, a current peak and a slow activation, the latter being related to the phenomenon of electrochemical promotion of catalysis.

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“…The exponent n e was found to be around 0.9 for the impregnated and the single-phase platinum electrode. The capacitance of 88 μFcm −2 for the single-phase platinum electrode was slightly higher than 20-70 μF cm −2 which has previously been reported for the oxygen reaction at the platinum/YSZ interface [20,21].…”

Section: Eis Measurements In Airmentioning

confidence: 45%

The effect of loading and particle size on the oxygen reaction in CGO impregnated Pt electrodes

Lund

Jacobsen

Mogensen

2011

J Solid State Electrochem

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Porous platinum electrodes impregnated with Gd x Ce 1−x O 2−δ (CGO) are investigated to characterise how nano-sized CGO grains affect the oxygen reaction. Impedance measurements were performed at temperatures between 450 and 750°C and at oxygen partial pressures of 0.2 and 5×10 −5 bar for electrodes with various CGO loadings and electrodes annealed at various temperatures. The morphology was characterised by scanning electron microscopy and the CGO grain size was determined from X-ray diffraction peak broadening. The results showed that the polarisation resistance decreased with increasing CGO loading and increasing annealing temperature. CGO facilitates transport of oxygen ions thereby increasing the effective triple-phase boundary.

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Reaction kinetics of the Pt, O2(g)|c-ZrO2 system: precursor-mediated adsorption

Cited by 120 publications

References 32 publications

Highly enhanced electrochemical performance of silicon-free platinum–yttria stabilized zirconia interfaces

Highly enhanced electrochemical performance of silicon-free platinum–yttria stabilized zirconia interfaces

Effect of microstructure on the electrochemical behavior of Pt/YSZ electrodes

The effect of loading and particle size on the oxygen reaction in CGO impregnated Pt electrodes

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