Electrochemical characterisation of the Pt/YSZ interface exposed to a reactive gas phase

Bultel, Laurence

doi:10.1016/j.ssi.2003.09.017

Cited by 19 publications

(6 citation statements)

References 22 publications

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“…Similarly, Bultel et. al [25] assigned the cathodic peak to the reduction of electrochemically produced oxygen species (either from the chemisorbed oxygen or a platinum oxide layer). Mutoro et al suggested that this cathodic peak may not be caused only by spillover oxygen or platinum oxide but could also be influenced by the presence of impurities [8].…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system

Ibrahim¹,

Poulidi²,

Rivas³

et al. 2012

Electrochimica Acta

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The role of sodium surface species in the modification of a platinum (Pt) catalyst film supported on 8 mol% yttria-stabilised-zirconia (YSZ) was investigated under a flow of 20 kPa oxygen at 400 o C. Cyclic and linear sweep voltammetry were used to investigate the kinetics of the oxygen charge transfer reaction. The Pt/YSZ systems of both 'clean' and variable-loading sodium-modified catalyst surfaces were also characterised using SEM, XPS and work function measurements using the Kelvin probe technique.Samples with sodium coverage from 0.5 -100% were used. It was found that sodium addition modifies the binding energy of oxygen onto the catalyst surface. Cyclic voltammetry experiments showed that higher overpotentials were required for oxygen reduction with increasing sodium coverage. In addition, sodium was found to modify oxygen storage and/or adsorption and diffusion increasing current densities at higher cathodic overpotential. Ex situ XPS measurements showed the presence of sodium hydroxide, carbonate and/or oxide species on the catalyst surface, while the Kelvin probe technique showed a decrease of approximately 250 meV in the work function of samples with more than 50% sodium coverage (compared to a nominally 'clean' sample).

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Section: Cyclic Voltammetrymentioning

confidence: 99%

The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system

Ibrahim¹,

Poulidi²,

Rivas³

et al. 2012

Electrochimica Acta

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Section: Resultsmentioning

confidence: 61%

“…As reported in the literature (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kokkofitis et al, 2005 , 2007 ; Kotsionopoulos and Bebelis, 2007 ) propane and oxygen adsorb competitively on Pt catalyst surface and, as a result, a Langmuir–Hinshelwood type kinetic behavior is observed. Competitive adsorption of oxygen and propane strongly favors oxygen (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kotsionopoulos and Bebelis, 2007 ). This explains positive reaction orders with respect to propane and zero or negative reaction orders with respect to oxygen, reported in the literature (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kokkofitis et al, 2005 , 2007 ; Kotsionopoulos and Bebelis, 2007 ).…”

Section: Resultsmentioning

confidence: 61%

“…Propane oxidation on Pt/β″-Al 2 O 3 (Ag + ) exhibits electrophobic behavior (i.e., the catalytic rate increase upon positive overpotential) as reported with Pt/β″-Al 2 O 3 (Na + ) and Pt/YSZ(O 2− ) electrochemical catalysts at stoichiometric conditions (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kokkofitis et al, 2005 , 2007 ; Kotsionopoulos and Bebelis, 2007 ; Kambolis et al, 2012 ). As reported in the literature (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kokkofitis et al, 2005 , 2007 ; Kotsionopoulos and Bebelis, 2007 ) propane and oxygen adsorb competitively on Pt catalyst surface and, as a result, a Langmuir–Hinshelwood type kinetic behavior is observed. Competitive adsorption of oxygen and propane strongly favors oxygen (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kotsionopoulos and Bebelis, 2007 ).…”

Section: Resultsmentioning

confidence: 63%

“…Competitive adsorption of oxygen and propane strongly favors oxygen (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kotsionopoulos and Bebelis, 2007 ). This explains positive reaction orders with respect to propane and zero or negative reaction orders with respect to oxygen, reported in the literature (Vernoux et al, 2002 ; Bultel et al, 2004 ; Kokkofitis et al, 2005 , 2007 ; Kotsionopoulos and Bebelis, 2007 ). Therefore, propane deep oxidation on Pt is limited by the propane adsorption.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical promotion of propane oxidation on Pt deposited on a dense β″-Al2O3 ceramic Ag+ conductor

Tsampas¹,

Kambolis²,

Obeid³

et al. 2013

Front. Chem.

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A new kind of electrochemical catalyst based on a Pt porous catalyst film deposited on a β″-Al2O3 ceramic Ag+ conductor was developed and evaluated during propane oxidation. It was observed that, upon anodic polarization, the rate of propane combustion was significantly electropromoted up to 400%. Moreover, for the first time, exponential increase of the catalytic rate was evidenced during galvanostatic transient experiment in excellent agreement with EPOC equation.

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A Cantaloupe‐Rind‐Inspired Nanostructured Textile Catalyst for Enhanced and Recoverable Performance in High‐Temperature Electrochemical Cells

Hidaka,

Maegawa,

Goto

et al. 2024

Adv Materials Inter

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Electrodes with a maximal active site density are critical for high‐performance high‐temperature electrochemical cells (HTECs). One widely employed approach involves the use of porous nanostructures with a high surface‐to‐volume ratio. However, their active site densities inevitably decrease owing to particle aggregation induced at high temperatures, necessitating further development of electrode processing techniques. Taking Pt/yttria‐stabilized zirconia (YSZ) interface as a model system, a Pt nanostructured textile akin to the cantaloupe‐rind pattern with high mechanical integrity is fabricated. Application of an AC voltage to this textile electrode at an elevated temperature reduces the Pt particle size from submicron to 10–80 nm forming a nanocomposite with YSZ, accompanied by a 40‐fold increase in current density under high‐temperature water electrolysis conditions. Furthermore, the AC voltage application to a partially aggregated electrode restores its nano‐blended structure associated with the recovery of its activity. This technique is effective in counteracting particle aggregation on demand, providing an alternative approach to achieve high performance and extended lifetimes in HTECs.

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Electrochemical characterisation of the Pt/YSZ interface exposed to a reactive gas phase

Cited by 19 publications

References 22 publications

The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system

The role of sodium surface species on oxygen charge transfer in the Pt/YSZ system

Electrochemical promotion of propane oxidation on Pt deposited on a dense β″-Al2O3 ceramic Ag+ conductor

A Cantaloupe‐Rind‐Inspired Nanostructured Textile Catalyst for Enhanced and Recoverable Performance in High‐Temperature Electrochemical Cells

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