Charge storage at the Pt/YSZ interface

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

doi:10.1007/s10832-007-9352-7

Cited by 30 publications

(21 citation statements)

References 12 publications

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“…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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“…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%

“…In this paper, recent studies are reviewed on the phenomenon of P-EPOC with Pt/YSZ catalyst combining reaction rate measurements in ethylene combustion [8] and electrochemical analysis [9]- [11], aiming at getting a deeper insight to the origin of P-EPOC.…”

Section: Introductionmentioning

confidence: 99%

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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“…The Pt/YSZ electrode was first characterized by electrochemical methods using chronoamperometry [8,9] and linear sweep voltammetry [8][9][10] in O 2 -containing atmosphere at 450°C. Then, used as catalyst and electrode at the same time, the catalytic activity of Pt deposited onto …”

Section: Resultsmentioning

confidence: 99%

The phenomenon of “permanent” electrochemical promotion of catalysis (P-EPOC)

et al. 2008

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The phenomenon of electrochemical promotion of catalysis (EPOC) is most often fully reversible. Subsequent to long-lasting polarization, however, the new steady-state open-circuit catalytic activity after current interruption may remain significantly higher than that before polarization. This phenomenon, discovered in our laboratory in the late 1990s and called permanent electrochemical promotion of catalysis (P-EPOC), has been observed on both oxide (IrO 2 , RuO 2 ) and metal (Rh) catalysts. P-EPOC is out of the state-of-the-art model of reversible EPOC, which considers the gas-exposed catalyst surface as the unique location of charge storage via backspillover of electrochemically generated promoter species accompanied by their consumption in the catalytic reaction ('sacrificial' promoter). Double step chronoamperometric and linear sweep voltammetric characterization of Pt catalyst deposited on YSZ solid electrolyte revealed the existence of a somewhat delayed oxygen storage occurring at the vicinity of the catalyst/electrolyte interface during prolonged anodic polarization. It is proposed that oxygen stored at this location, hidden for the reactant, and then released during relaxation was at the origin of P-EPOC on the Pt/YSZ catalyst observed in catalytic combustion of ethylene with oxygen. The effect of this 'hidden' promoter on the catalytic reaction rate was found to be highly non-Faradaic.

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“…For a better understanding, a series of techniques such as single and double step chronoamperometry, chronocoulometry and programmed cyclic voltammetry were performed as reported in [22]. They indicated that application of an anodic polarization on the Pt/YSZ system caused short and long term oxygen storage in the working electrode.…”

Section: Discussionmentioning

confidence: 99%