Electrochemical study of some palladium compounds at a carbon paste electrode—application to the determination of palladium in oxidation automotive catalysts

Adekola, Folahan A.; Diaw, Mahy; Colin, C.; Bauer, D.

doi:10.1016/0013-4686(92)87089-i

Cited by 14 publications

(12 citation statements)

References 9 publications

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“…for Pd(") species at carbon paste electrodes was observed by Adekola et al [5]. In the present study there are some indications for the existence of two different palladium species at the electrode surface.…”

Section: Surface Bound Palladiumsupporting

confidence: 71%

“…After a short period where the current is independent of the time, a longer period with linear current-time dependence in stirred solution was observed. The results of Adekola [5] concerning the kinetics of the palladium deposition at carbon electrodes could be confirmed qualitatively. Detailed kinetic investigations are beyond the scope of the present study.…”

Section: Surface Bound Palladiumsupporting

confidence: 58%

“…Because of these dependences the redox couple could be caused by the reduction of H+ at palladium deposited at the carbon surface and the oxidation of the hydrogen, respectively. This redox behavior of hydrogen is well known at palladium electrodes [22, 231 and was also described for carbon paste electrodes modified with palladium black and palladium compounds [5]. The simultaneous increase of hydrogen and palladium oxidation currents after cathodic pretreatment (Fig.…”

Section: Influence Of Proton Concentrationmentioning

confidence: 89%

“…A study on the voltammetric behavior of Pd (palladium black), PdO and PdCI2 as well as palladium containing automotive catalysts in acid supporting electrolytes was published by Adekola et al [5]. They used carbon paste electrodes produced by mixing the solid substance with graphite powder and some electrolyte.…”

Section: Introductionmentioning

confidence: 99%

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Voltammetric study of the immobilization of palladium at the surface of carbon paste electrodes

1996

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The immobilization of palladium at the surface of unmodified carbon paste electrodes is studied by cyclic voltammetry. Some features of the voltammetric behavior of palladium(1i) at carbon paste electrode in chloride solution are elucidated. Through pretreatment at 0 V (vs. Ag/ AgCI) palladium is bound at the surface of the carbon paste. The amount immobilized depends on the composition of the solution, polarization time, electrode potential and stirring. During an anodic scan the surface-bound palladium is oxidized at about +0.6 V; the wellshaped peaks can be utilized for the determination of the immobilized Pd. The detection limit is about 5 x M Pd2+ after 5 min polarization at 0 V (vs. Ag/AgCl) with stirring (base electrolyte 1 M KCI, pH 5.5). The rather complicated influence of hydrogen ions on the reactions at the palladium/carbon surface is discussed. Palladium and hydrogen can be "deposited" simultaneously at the carbon paste surface through cathodic polarization. Electrode reactions related to the observed peaks are suggested.

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Section: Surface Bound Palladiumsupporting

confidence: 71%

Section: Surface Bound Palladiumsupporting

confidence: 58%

Section: Influence Of Proton Concentrationmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Voltammetric study of the immobilization of palladium at the surface of carbon paste electrodes

1996

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“…Other work has demonstrated the high activity of carbon-black-supported Pd (promoted with Ru) for hydrogen peroxide electroreduction, which makes this system promising as a cathode catalyst for fuel cells using H 2 O 2 as oxidant [14]. Numerous electrochemical studies of Pd/C systems were performed [2, 3,5,8,10,[12][13][14][15] to explore the surface-active states (or sites) of dispersed Pd in various electrolyte solutions. This seems to be the most active electrocatalyst for the anodic oxidation of various organics in low pH solution [16,17].…”

mentioning

confidence: 99%

Cyclovoltammetric studies of carbon materials-supported palladium

Hofman

Świątkowski

Pakuła

et al. 2012

Reac Kinet Mech Cat

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Various Pd amounts (5 and 20 %wt) were chemically deposited on two different carbon materials (activated carbon and carbon black). Support materials were characterized using low-temperature N 2 adsorption and FTIR spectroscopy. SEM images and X-ray diffraction patterns were obtained for the samples tested. Cyclic voltammetric curves in 0.1 M H 2 SO 4 were recorded over a variable sweep potential range for carbon materials with and without Pd. For comparison, the same electrochemical measurements were performed for powdered palladium. The hydrogen electro-oxidation potential decreased and the removal of adsorbed hydrogen by activated carbon-supported palladium was facilitated, which enables these systems to be used as anodes in hydrogen-oxygen fuel cells.

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Sensors based on carbon paste in electrochemical analysis: A review with particular emphasis on the period 1990–1993

et al. 1995

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A review is presented dealing with the use of carbon paste as an electrode material for electrochemical sensors (3 11 references). It covers mainly publications which appeared during the period 1990-1993; numerous applications demonstrate the widespread applicability of carbon paste in the field of electrochemical analysis, such as voltammetry, amperometry, and potentiometry, but also as an electrode for electrochemical detectors in flow systems.

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Electrochemical study of some palladium compounds at a carbon paste electrode—application to the determination of palladium in oxidation automotive catalysts

Cited by 14 publications

References 9 publications

Voltammetric study of the immobilization of palladium at the surface of carbon paste electrodes

Voltammetric study of the immobilization of palladium at the surface of carbon paste electrodes

Cyclovoltammetric studies of carbon materials-supported palladium

Sensors based on carbon paste in electrochemical analysis: A review with particular emphasis on the period 1990–1993

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