Hydrogen sorption and desorption related properties of Pd-alloys determined by cyclic voltammetry

Uluc, A.v.; Mol, J.M.C.; Terryn, Herman; Böttger, A.

doi:10.1016/j.jelechem.2014.09.021

Cited by 15 publications

(6 citation statements)

References 34 publications

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“…15 Electrocatalytic activity.-Figure 6a compares the cyclic voltammogram (CV) profiles recorded for CeO 2 @Pd at two ceria concentrations and pure Pd as a reference. The CV shows the typically Pd features [49][50][51][52][53] : (I) under potential deposition (UPD) of atomic hydrogen from the H 2 O molecule (H UPD ) 54 ; (II) H 2 evolution reaction (HER) [55][56][57][58] and Pd hydride formation (atomic hydrogen absorption) 59,60 ; (III) oxidation of the absorbed hydrogen atoms, H abs , formed in the region II 51,52 ; (IV) desorption of the H UPD hydrogen atoms, formed in the region I 54 ; (V) Pd electrooxidation 49 ; and (VI) PdO electrochemical reduction (used to calculate the electrochemical surface area). 49,53,54 Additional details are provided in the Supplementary Material.…”

Section: Resultsmentioning

confidence: 99%

Ceria Entrapped Palladium Novel Composites for Hydrogen Oxidation Reaction in Alkaline Medium

Ralbag

Davydova

Mann‐Lahav

et al. 2020

J. Electrochem. Soc.

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A new heterogeneous catalyst for hydrogen oxidation reaction (HOR), metallic palladium within which nanoparticles of ceria are entrapped, CeO2@Pd, is described. Its preparation is based on a new materials methodology of molecular doping of metals. The metallic matrix, which encages the nanoparticles, is prepared in foam architecture, to ensure easy molecular diffusion. Characterization of the structural properties of the CeO2@Pd composite using SEM, STEM, TEM, XRD, EXAFS and nitrogen adsorption reveals its morphological architecture, which leads to improved catalytic activity. In-situ electrochemical and H2 temperature-programmed reduction (H2-TPR) spectra provide direct experimental evidence of the weakening of Pd‒H bond in the CeO2@Pd composites, relative to pure (undoped) Pd catalysts. Gas diffusion electrodes based on the entrapped CeO2@Pd catalysts demonstrated one order of magnitude higher activity than pure Pd analog in the HOR reaction in an alkaline medium.

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Section: Resultsmentioning

confidence: 99%

Ceria Entrapped Palladium Novel Composites for Hydrogen Oxidation Reaction in Alkaline Medium

Ralbag

Davydova

Mann‐Lahav

et al. 2020

J. Electrochem. Soc.

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“…In the study of A.V. Uluc et al, 26 hydrogen sorption/desorption properties of bulk Pd-Au and Pd-Mo-Cu alloys were investigated using the similar electrochemical methodology as in our current study. Similarly, in the further work of A.V.…”

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confidence: 94%

Development of an Electrochemical Procedure for Monitoring Hydrogen Sorption/Desorption in Steel

Özdirik

Baert

Depover

et al. 2017

J. Electrochem. Soc.

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Hydrogen embrittlement leads to mechanical degradation of metals. Hence, hydrogen sorption/desorption properties of metals need to be characterized. An electrochemical procedure based on cyclic voltammetry (CV) and potentiostatic polarization is elaborated on plain-carbon steel. The procedure consists of first two consecutive CV cycles (pretreatment and reference CV), followed by cathodic H-charging, and subsequent CV scans to study and quantify the H-sorption/desorption. Best practice in this procedure is to perform all steps consecutively without interruption or sample manipulations between steps to avoid spontaneous H-loss. The H-related interaction with the steel is clearly identified in the CV and can be differentiated from the electrolyte contribution coming from thiourea. The study confirms the role of thiourea as H-recombination poison in alkaline solution, and also demonstrates that it contributes to the CV response. Additionally, various charging times are investigated to study the time to H-saturation, and also the scan rate during the CV procedure is varied to study time-related phenomena. Dedicated discharging experiments were included in the study to complement the CV data, giving additional insights in the H-steel interaction. Moreover, hydrogen related findings are successfully verified by using a complimentary method, i.e. hot extraction. The better understanding of the peaks in the CV and the continuous procedure result in a reliable methodology to characterize the H-sorption/desorption in steel. Hydrogen embrittlement is the phenomenon leading to mechanical degradation of metals, in particular, a loss of ductility and toughness. The intensity of hydrogen degradation depends on many factors related to the nature of hydrogen and the material itself. Hydrogen can be incorporated in steel during the manufacturing process as well as during various stages of its use. After hydrogen absorption, it diffuses into the microstructure and is distributed between interstitial sites in the metal lattice and its structural defects. The hydrogen in the microstructure can roughly be classified in two forms, diffusible and trapped hydrogen.1 Although the term diffusible hydrogen has multiple descriptions in literature, it can be considered as the hydrogen that can move between lattice positions within a reasonable time frame according to the laws of diffusion. On the other hand, hydrogen that resides for a longer time near microstructural inhomogeneities (interfaces, grain boundaries, precipitates) as well as hydrogen accumulated in micro cracks and blisters, is called trapped.2 Depending on the binding energy of hydrogen to the trapping sites, trapped hydrogen can be classified as reversible or irreversible. [3][4][5][6] To study the hydrogen-trap interaction, thermal desorption spectroscopy (TDS) can be used. By means of this method, an activation energy of the traps can be determined and the traps can be categorized as reversible or irreversible, as studied in e.g. Refs. 7-15. For instance, MnS inclusions wit...

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“…Researchers are mostly focused on the synthesis of new electrode material and hydrogen sorption from gas phase [1][2][3][4], wherein the impact of the electrolyte is often overlooked. Therefore, in the literature, there are many publications dedicated to hydrogen electrosorption in Pd-based electrodes from acidic water solutions [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Unfortunately, not many researchers address the problem of hydrogen sorption in alkaline media [22][23][24][25][26][27][28][29][30][31][32][33][34][35] being confined predominantly to Pd examination in diluted solutions.…”

Section: Introductionmentioning

confidence: 99%

Tuning hydrogen sorption properties of Pd by its alloying with Ru, Rh, and Pt: the study of binary alloys in concentrated alkaline media

Hubkowska

Czerwiński

2020

J Solid State Electrochem

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The hydrogen electrosorption process was examined in 6 M KOH on Pd binary alloys, containing Rh, Ru, and Pt. Pd-alloys were electrochemically deposited on Au substrate. The electrodes were subjected to activation procedure—hydrogen pretreatment procedure (HPP) at first in 0.5 M H2SO4 and then in 6 M KOH. It was noticed that it was possible to achieve comparable reversibility of hydrogen electrosorption process in acid and in concentrated base. The obtained values of the α→β phase transition potential, hysteresis extent, and maximum hydrogen absorption capacity show good agreement with the data from acidic medium. The observed kinetics of hydrogen electrosorption were strongly hindered in concentrated alkaline media, whereas the influence of the electrolyte on the thermodynamic functions of hydrogen absorption is less pronounced.

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Hydrogen sorption and desorption related properties of Pd-alloys determined by cyclic voltammetry

Cited by 15 publications

References 34 publications

Ceria Entrapped Palladium Novel Composites for Hydrogen Oxidation Reaction in Alkaline Medium

Ceria Entrapped Palladium Novel Composites for Hydrogen Oxidation Reaction in Alkaline Medium

Development of an Electrochemical Procedure for Monitoring Hydrogen Sorption/Desorption in Steel

Tuning hydrogen sorption properties of Pd by its alloying with Ru, Rh, and Pt: the study of binary alloys in concentrated alkaline media

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