The study of hydrogen electrosorption in layered nickel foam/palladium/carbon nanofibers composite electrodes

Skowroński, J. M.; Czerwiński, A.; Rozmanowski, Tomasz; Rogulski, Z.; Krawczyk, Piotr

doi:10.1016/j.electacta.2006.12.008

Cited by 34 publications

(21 citation statements)

References 38 publications

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“…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: Introductionsupporting

confidence: 66%

“…As has been shown in [11], the amount of hydrogen gas produced at the Pd surface, e.g., due to lowering the potential of hydrogen sorption from −1.1 to −1.25 V in the region where hydrogen absorption into Pd electrode is accompanied by hydrogen evolution, has insignificant contribution to the charge of the anodic peak of hydrogen recovery. This result is consistent with measurements performed with and without removal of gaseous hydrogen dissolved in the electrolyte [8], which evidenced that the oxidation of hydrogen from the solution has no noticeable influence on the total charge calculated from the oxidation peak used for the calculation of the amount of absorbed hydrogen.…”

Section: Resultsmentioning

confidence: 88%

“…Before starting the CV measurements, electrodes were electrochemically activated by cycling (10 cycles) in the potential range between −1.1 V and 0.3 V in KOH solution to attain a steadystate behavior. Such a treatment allowed us to enhance the electrochemical activity of examined electrodes in the process of sorption/desorption of hydrogen as compared to non-activated electrodes examined in our previous work [11].…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Introductionsupporting

confidence: 66%

Section: Resultsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Electrochemical Hydrogen Storage in Amine‐Activated Polydopamine

Coskun

Aljabour

Greunz

et al. 2020

Advanced Sustainable Systems

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Electrochemical hydrogen storage combines the evolution, oxidation, and storage of hydrides from aqueous electrolytes and ionic liquids, but presently requires palladium or rare‐earth metals to achieve significant power capacities. Here hydrogen electrosorption in amine‐activated polydopamine is shown. The organic heterogeneous amine‐hydride yields a gravimetric hydrogen density of 0.44%, corresponding to a 80% hydride‐per‐monomer content, and offers similar reaction kinetics as for palladium and related systems. An initial stability test of 100 electrosorption cycles that demonstrates resilience in acidic media with a tendency for increased capacity over time is included. In situ vibronic amine‐hydride fingerprints corroborate the reversibility and stability of the conversion process and highlight the merits of amine‐activated polydopamines as a heterogeneous organic hydrogen storage system.

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