Charge storage in the O2(g),Pt/YSZ system

Jaccoud, Arnaud; Falgairette, Cyril; Fóti, György; Comninellis, Christos

doi:10.1016/j.electacta.2007.06.046

Cited by 47 publications

(38 citation statements)

References 16 publications

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“…These observations are in good agreement with linear sweep voltammetric measurements, made first with moderate [9] and later with very long anodic potential holding [10]. The measurements consisted of a cathodic pretreatment step, identical to that of the above chronoamperometric experiments, and an anodic potential holding step at E h = +100 mV for different holding times between 1 and 2000 minutes, followed by a linear potential sweep down to a cathodic potential of -800 mV with a scan rate of 10 mV s −1 (first cathodic scan).…”

Section: /2supporting

confidence: 77%

“…After current interruption this hidden influence becomes visible, so the species implicated must reach somehow the active catalytic surface of the system. [10]. Effect of the holding time, t h , at the anodic potential of E h = 100 mV on the current transients obtained during the cathodic discharging step (C).…”

Section: Resultsmentioning

confidence: 99%

“…Insert: schematic illustration of the current response to the subsequent potential steps: cathodic pretreatment (A), anodic polarization (B), and cathodic discharge (C). Double-step chronoamperometric measurements [10] were made at 450˚C using a potential program composed of a pretreatment step and two measurement steps (see the inset in Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical characterization of the Pt/YSZ electrode was made using chronoamperometry [10,11] and linear sweep voltammetry [9]- [11] in O 2 -containing atmosphere.…”

Section: Resultsmentioning

confidence: 99%

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Charge storage at Pt/YSZ interface as the origin of `permanent' electrochemical promotion of catalysis

Fóti

2009

Per. Pol. Chem. Eng.

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Tuning of the catalytic reaction rate by electric polarization of the interface between an electron conducting catalyst and an ion conducting support, called electrochemical promotion of catalysis (EPOC), is most often fully reversible. Its stateof-the-art model regards the gas-exposed catalyst surface as the unique location of charge storage via backspillover of electrochemically generated species, responsible for promotion. After long-lasting anodic polarization, a permanent effect (P-EPOC) was observed in ethylene combustion with oxygen over Pt/YSZ catalyst. Double step chronoamperometric and linear sweep voltammetric analysis revealed delayed oxygen storage, located presumably at the vicinity of the catalyst/electrolyte interface. It is proposed that oxygen stored at this location, hence hidden for the reactants and then released during relaxation, was at the origin of the observed P-EPOC. The effect of this 'hidden' promoter on the catalytic reaction rate was found to be highly non Faradaic.

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Section: /2supporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Electrochemical characterization of the Pt/YSZ electrode was made using chronoamperometry [10,11] and linear sweep voltammetry [9]- [11] in O 2 -containing atmosphere.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Charge storage at Pt/YSZ interface as the origin of `permanent' electrochemical promotion of catalysis

Fóti

2009

Per. Pol. Chem. Eng.

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“…This strongly indicates that the polarization at long t p must influence a part of the system which is not exposed to the catalytic reaction. At current interruption, this "hidden" influence becomes visible, so the species implicated must reach the active catalytic surface of the system [19].…”

Section: Anodic Polarization In the Presence Of Reactive Gasesmentioning

confidence: 99%