Determination of hydrogen absorption isotherm and diffusion coefficient in Pd81Pt19 alloy

Vigier, F.; Jurczakowski, Rafał; Lasia, Andrzej

doi:10.1016/j.jelechem.2005.11.035

Cited by 30 publications

(11 citation statements)

References 45 publications

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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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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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“…Stirring the solution, bubbling argon gas through the electrolyte or using a rotating ring-disk electrode will reduce the amount of dissolved hydrogen in solution but will not ensure complete bubble removal from the surface. 38,39 We report here an electrochemical flow cell (Figure 2) for the precise and accurate coulometric quantification of hydrogen absorption by palladium films and nanoparticles. The flow of electrolyte directed at the palladium surface serves to displace hydrogen bubbles from the surface of the electrode and prevent continued absorption during the desorption measurement.…”

Section: ■ Introductionmentioning

confidence: 99%

Accurate Coulometric Quantification of Hydrogen Absorption in Palladium Nanoparticles and Thin Films

et al. 2018

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We report here an electrochemical method for precise and accurate quantification of hydrogen absorption in palladium materials. We demonstrate that conventional chronocoulometry over-reports adsorbed hydrogen due to charge from the accompanying hydrogen oxidation reaction (HOR). We designed and built a bespoke electrochemical flow cell that mitigates the concurrent HOR reaction and consequently provides improved accuracy and reproducibility relative to other existing electrochemical techniques. The efficacy of this technique is demonstrated experimentally for a series of palladium sample types: a 100 nm electron-beam deposited thin film, a 20 μm electrodeposited palladium film, a casting of 21 nm edge-length cubic nanoparticles, and a casting of 27 nm edge-length octahedral nanoparticles. We contend that this method is the most effective for measuring hydrogen uptake in different palladium samples.

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“…The maximum rate proportional to the difference between P up and phase transition pressure leads to the rate-limiting step of Langmuir adsorption or Knudsen flow in voids according to [27]. However, the analysis does not take into account the effects of temperature change, stress gradient [28,29,30], and dislocations [31,32]. In particular, the phase transition to LaNi 5 H 6 is an exothermal reaction, which changes the reaction rates.…”

Section: Resultsmentioning

confidence: 99%

“…Palladium is “prohibitively [34]” expensive, and LaNi 5 is more economical. Moreover, though the sample is subjected to less load in this work, hydrogen storage ability is changed by stress [28,29,30]. The swelling behavior change under stress is important information because an actuator receives the reactive force, which is a topic for future research.…”

Section: Resultsmentioning

confidence: 99%

Suitability Evaluation of LaNi5 as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change

et al. 2019

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The swelling ability of LaNi5 for application to hydrogen-storage-alloy (HSA) actuator is discussed through the measurement of the swelling ratio in hydrogen. The HSA actuator is driven by hydrogen pressure change causing the swelling of HSA. LaNi5 is one of the candidate materials for HSA actuators as well as palladium. Some prototypes of HSA actuators using LaNi5 have been fabricated; however, the kinetic swelling ability of LaNi5 itself has been not investigated. In this paper, the authors investigated the static and kinetic swelling ability of LaNi5 powder under hydrogen atmosphere. The results showed that the swelling ratio increased by 0.12 at the phase transition pressure. Response time decreased with an increase in the charged pressure during absorption, while it remained constant during discharge. Reaction kinetics revealed that these swelling behaviors were explained by hydrogen absorption and lattice expansion. The swelling ability of LaNi5 was also compared with that of palladium. The results show that LaNi5 swells 1.8 times more than palladium under 0.5 MPa. LaNi5 is suitable for an actuator driven repeatedly under more than the phase transition pressure. Palladium can be used for one-way-operation actuator even under 0.1 MPa since its response time during the evacuation was much longer than during the pressurization.

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Determination of hydrogen absorption isotherm and diffusion coefficient in Pd81Pt19 alloy

Cited by 30 publications

References 45 publications

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

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

Accurate Coulometric Quantification of Hydrogen Absorption in Palladium Nanoparticles and Thin Films

Suitability Evaluation of LaNi5 as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change

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