The study of hydrogen sorption in palladium limited volume electrodes (Pd-LVE)

Czerwiński, A.; Kiersztyn, Iwona; Grdeń, M.; Czapla, Justyna

doi:10.1016/s0022-0728(99)00276-4

Cited by 86 publications

(51 citation statements)

References 20 publications

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“…The curves recorded at the maximal potential range show the peak reduction (ca 270 mV) of the hydrogen ions (in the adsorption layer) and hydrogen evolution wave (hydrogen absorption). As a response, there are two anodic peaks: the first (a), in the range from -220 mV (AC) to -80 mV (AC-20% Pd), corresponds to the oxidation of adsorbed/absorbed hydrogen, while the second one, (a', only for 20% Pd-containing electrodes) in the potential region from -80 to -20 mV, is ascribed to the oxidation of chemisorbed hydrogen [2,30]. Peak currents depend strongly on the amount of metal supported on carbon.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Cyclovoltammetric studies of carbon materials-supported palladium

Hofman

Świątkowski

Pakuła

et al. 2012

Reac Kinet Mech Cat

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“…A very important factor influencing the electrode activity is also the physicochemical property of the electrode support/current collector, which should represent the high specific surface area, good electrical conductivity, and low weight. It is well known that metals such as platinum, palladium, and their alloys exhibit high activity in the processes of hydrogen sorption/desorption [6][7][8][9][10][11][12][13]. Recently, an increasing attention has been paid on palladium and palladium-based electrodes due to their high electroactivity and lower price in comparison with platinum.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, an increasing attention has been paid on palladium and palladium-based electrodes due to their high electroactivity and lower price in comparison with platinum. It has been shown in many works [9][10][11][12][13] that hydrogen can be electrochemically stored (cathodically sorbed) in palladium and palladium alloys at room temperature and under atmospheric pressure and then easily recovered (anodically desorbed). It has been reported by Czerwiński et al [9,10] that the palladium limited volume electrodes (Pd-LVE), consisting of a thin layer of Pd deposited on a gold support, exhibit high specific volume capacity of hydrogen with an H/Pd ratio around 0.7.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown in many works [9][10][11][12][13] that hydrogen can be electrochemically stored (cathodically sorbed) in palladium and palladium alloys at room temperature and under atmospheric pressure and then easily recovered (anodically desorbed). It has been reported by Czerwiński et al [9,10] that the palladium limited volume electrodes (Pd-LVE), consisting of a thin layer of Pd deposited on a gold support, exhibit high specific volume capacity of hydrogen with an H/Pd ratio around 0.7. A similar value was also found for nickel foam/ palladium composite electrodes in alkaline solution [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Relationship between the reactions of hydrogen sorption/desorption and methanol oxidation on bifunctional Ni/Pd electrode in alkaline solution

Skowroński

Rozmanowski

2012

J Solid State Electrochem

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The present paper is aimed at studying the influence of the hydrogen sorption/desorption process occurring on the layered nickel-palladium (Ni/Pd) electrode on the kinetics of the reaction of methanol oxidation in strong alkaline KOH solution. The electrodes were prepared by chemical deposition of a thin layer of porous palladium on a nickel foam support. A scanning electron microscope was used for studying the morphology of both the nickel support and the porous palladium layer. The mechanism of the anodic desorption of hydrogen changes depending on whether or not 6 M KOH electrolyte is admixed with methanol. It was shown that, in the first cycle of the cyclic voltammetry (CV) measurements, the anodic peak current and peak charge related to the oxidative desorption of hydrogen significantly decrease due to the presence of methanol in KOH. This effect is attributed to the obstacles in hydrogen sorption due to the formation of a passivating layer on the Pd surface composed of both adsorbed methanol molecules and the intermediate products involving adsorbed CO. On the other hand, hydrogen desorbing from Pd electrode exerts influence on the kinetics of the reaction of methanol oxidation. Ni/Pd electrode undergoes considerable reactivation due to the potentiostatic saturation with hydrogen at −1.1 V, followed by the ease in hydrogen desorption. The CV measurements proved that, after such a treatment, the peak of hydrogen desorption partially overlaps the double peak of methanol oxidation and, in consequence, the rate of methanol oxidation is enhanced. The positive effect of hydrogen releasing from the electrode on the kinetics of the reaction of methanol oxidation is ascribed to the anti-poison behavior consisting in the reaction of hydrogen radicals with intermediates adsorbed on the Pd surface.

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“…Recently, much attention has been focused on the preparation of Pd nanoparticles and their application in the fields of catalysis [7], hydrogen storage [8], and chemical sensors [9] because of the large surface area-to-volume ratio, relatively lower price than Pt, and especially the unique function in absorption of hydrogen [10,11]. Pd exhibits interestingly much higher catalytic activity than Pt toward formic acid electro-oxidation, since it is free from poisoning by CO [12,13].…”

Section: Introductionmentioning

confidence: 99%

Time-efficient microwave synthesis of Pd nanoparticles and their electrocatalytic property in oxidation of formic acid and alcohols in alkaline media

Mehta

Gupta

2011

J Appl Electrochem

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In this study time-efficient size controlled synthesis of stable Pd nanoparticles was carried out using microwave heating method by the decomposition of palladium chloride with glucose in aqueous medium using poly(ethyleneglycol) as capping agent. The benefit of the synthesis is that it was achieved in only 20 s. The synthesized Pd nanoparticles were characterized by UV-Visible spectroscopy, transmission electron microscopy, X-ray diffraction, and particle size analysis. The relative rates of electro-oxidation of formic acid, methanol and ethanol measured by cyclic voltammetry showed that efficiency of Pd nanoparticles as catalyst followed the order: formic acid \ methanol \ ethanol. The current-voltage characteristics improved with increase in either electrolyte (NaOH) or fuel concentrations but decreased with further increase in NaOH concentration.

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The study of hydrogen sorption in palladium limited volume electrodes (Pd-LVE)

Cited by 86 publications

References 20 publications

Cyclovoltammetric studies of carbon materials-supported palladium

Cyclovoltammetric studies of carbon materials-supported palladium

Relationship between the reactions of hydrogen sorption/desorption and methanol oxidation on bifunctional Ni/Pd electrode in alkaline solution

Time-efficient microwave synthesis of Pd nanoparticles and their electrocatalytic property in oxidation of formic acid and alcohols in alkaline media

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