AC electrical resistance measurements of PdHx samples versus composition x

Tripodi, P.; Gioacchino, D. Di; Vinko, Jenny Darja

doi:10.1016/j.jallcom.2009.07.052

Cited by 22 publications

(18 citation statements)

References 8 publications

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“…The widely-used resistance ratio method 34 aims to take advantage of the dependence of Pd electrical resistivity on hydrogen concentration, which exhibits a maximum at x~0.7. 35 However, this technique is complicated by the existence of two compositions that correspond to the same resistance ratio, any variations in temperature during measurement, irreversible resistivity changes due to stress-induced microstructure evolution in the Pd alloy, and electrical shunt pathways through the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical oxidation (coulometry) of the absorbed H , is subject to both (1) H/Pd ratio overestimation from the oxidation of coevolved hydrogen gas remaining from the insertion process and (2) H/Pd ratio underestimation due to gas desorption during switching from reducing to oxidizing potentials. The widely used resistance ratio method aims to take advantage of the dependence of Pd electrical resistivity on hydrogen concentration, which exhibits a maximum at x ≈ 0.7 . However, this technique is complicated by the existence of two compositions that correspond to the same resistance ratio, any variations in temperature during measurement, irreversible resistivity changes due to stress-induced microstructure evolution in the Pd alloy, and electrical shunt pathways through the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Producing High Concentrations of Hydrogen in Palladium via Electrochemical Insertion from Aqueous and Solid Electrolytes

et al. 2019

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Metal hydrides are critical materials in numerous technologies including hydrogen storage, gas separation, and electrocatalysis. Here, using Pd-H as a model metal hydride, we perform electrochemical insertion studies of hydrogen via liquid and solid state electrolytes at 1 atm ambient pressure, and achieve H:Pd ratios near unity, the theoretical solubility limit. We show that the compositions achieved result from a dynamic balance between the rate of hydrogen insertion and evolution from the Pd lattice, the combined kinetics of which are sufficiently rapid that operando experiments are necessary to characterize instantaneous PdHx composition. We use simultaneous electrochemical insertion and X-ray diffraction measurements, combined with a new calibration of lattice parameter versus hydrogen concentration, to enable accurate quantification of the composition of electrochemically synthesized PdHx. Furthermore, we show that the achievable hydrogen concentration is severely limited by electrochemomechanical damage to the palladium and/or substrate. The understanding embodied in these results helps to establish new design rules for achieving high hydrogen concentrations in metal hydrides.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Producing High Concentrations of Hydrogen in Palladium via Electrochemical Insertion from Aqueous and Solid Electrolytes

et al. 2019

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“…The region between x = 0 and x = 0.75 is based on the experimental reported data [12,13], while the region x > 0.75 is based on references [14][15][16].…”

Section: Resultsmentioning

confidence: 99%

“…16 . This lattice expansion contradicts literature data available (which show elongation of about 4% for PdH 0.8 ).…”

Section: Resultsmentioning

confidence: 99%

Strain and resistivity of PdHx at hydrogen composition x>0.8

Tripodi

Avveduto²,

Vinko³

2010

Journal of Alloys and Compounds

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“…Resistometry is also used to evaluate the hydrogen content in Pd as resistivity is dependent on the atomic ratio, H/Pd. Conclusion on the electrical resistance of PdH x versus composition x and correlated physical phenomena have been done [43][44][45][46][47][48][49]. The resistivity of Ti has also been reported to change with hydrogen content [50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%