In situ measurement of lattice parameter change on Pd and Ni during cathodic hydrogen charging

Tsukuda, Noboru; Ito, Kikukatsu; Morioka, Nozomi; Ohkubo, H.; Kuramoto, Eiichi

doi:10.1016/s0925-8388(99)00416-8

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…7). Hydrogen decreases the magnetic moment of nickel in pure nickel and Ni-Pd alloys [5]. In the annealed condition the magnetization saturation (m s ) is 34.6 Am 2 /kg (curve a).…”

Section: Resultsmentioning

confidence: 98%

X-ray diffraction, scanning electron microscopy and magnetic characterization of hydrogenated Ni–Pd alloys

Tavares¹,

Pardal²,

Gurova³

et al. 2004

Journal of Alloys and Compounds

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“…7). Hydrogen decreases the magnetic moment of nickel in pure nickel and Ni-Pd alloys [5]. In the annealed condition the magnetization saturation (m s ) is 34.6 Am 2 /kg (curve a).…”

Section: Resultsmentioning

confidence: 98%

X-ray diffraction, scanning electron microscopy and magnetic characterization of hydrogenated Ni–Pd alloys

Tavares¹,

Pardal²,

Gurova³

et al. 2004

Journal of Alloys and Compounds

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“…14 Hydrogen dissolves discontinuously in the Pd matrix, and at room temperature between the two hydride phases there exists the socalled miscibility gap due to very different parameters of their crystal lattices. 17,18 This leads to the accumulation of mechanical stress under cyclic hydrogen absorption/desorption and to the failure of a membrane with time. We believe that the photographs in Fig.…”

Section: Discussionmentioning

confidence: 99%

Hydrogenation Behavior of Yttrium Thin-Film Electrode in 1 M NAOH Electrolyte after Removal of Palladium Cap

Matveeva

Parkhutik

2004

J. Electrochem. Soc.

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Electrochemical loading/release of hydrogen into a thin-film yttrium ͑Y͒ electrode ͑200 nm͒ capped with a Pd protective layer ͑20 nm͒ is reported and compared with the behavior of the same electrode after removal of the protection. The system is of interest for the development of rare-earth based optical switchable devices. The stripping procedure was done on the previously cycled electrode when the uppermost protective Pd layer had been detached from the yttrium film. The Pd detachment as shown by scanning electron microscopy and chemical analysis of the different areas of the surface made it evident that a Pd remnant was still present on the electrode ͑5-7 nm͒. The electrochemical behavior of such a stripped Y electrode was stable but different from the former protected one and optical switching was observable as well. We discuss the role of the surface protection in optical devices based on hydrides, materials and morphology, and oxidation of the active metal ͑yttrium in our case͒ after the protection failure. It is proposed to use the Pd-containing alloys developed for hydrogen permeation systems in the form of surface patches/gates for hydrogen uptake into the active material and oxidize the rest of the surface to prevent it from further alteration.The recent discovery of optical switching in yttrium and other rare earth metal/alloy hydrides has stimulated an interest in studies of the kinetics and mechanism of this phenomenon with the purpose of employing this effect for optical switching devices. 1-8 In the case of yttrium ͑Y͒ the reversible optical changes are attained between the di-YH 2Ϫ␤ ͑␤-phase͒ and tri-YH 3Ϫ␥ ͑␥-phase͒ hydrides due to the metal ͑reflecting state͒-semiconductor ͑transparent state͒ transition. Yttrium also posseses the ␣-YH ϳ0.2 phase, or solid solution of hydrogen in the yttrium lattice, which does not play a role in the switchable devices. Hydrogenation of the active metal/alloy can be performed in either hydrogen gas or solution, though the latter ͑when performed under electrochemical control͒ seems to be more reliable.Hydrogenation in a liquid phase is accompanied by some problems, and one of them is the high chemical activity of the rare earth metals 9 toward aqueous electrolytes. The reactivity of yttrium leads to oxidation and transformation of the active layer to either an oxide phase or to complete dissolution. [10][11][12][13] To overcome this uncontrollable and irreversible yttrium oxidation, a protective ͑capping͒ Pd layer was proposed and employed in previous work. The choice was based on the well-known properties of Pd which allow hydrogen transport and its use as a hydrogen membrane. 14 The hydrogenation of Pd was studied in detail ͑for a review, see Ref. 14͒, and it was recognized that this metal posseses the two hydrides, an ␣-phase of a solid-state solution with a H content up to 0.05; and a ␤-phase or true hydride with H content close to 0.7. The electrochemical hydrogen loading into the bimetallic electrode ͑yt-trium covered by a thin palladium cap͒ was studied in ...

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“…Data regarding the strain for corresponding H/Pd ratios is well known up to a concentration of H/Pd < 0.7 [3][4][5][6][7][8][9][10][11]. On the contrary, only exiguous and contrasting data for the physical behaviour of the lattice expansion corresponding to loading ratios greater than H/Pd = 0.7 [3] is available.…”

Section: Introductionmentioning

confidence: 98%

Strain and resistivity of PdHx at hydrogen composition x>0.8

Tripodi

Avveduto²,

Vinko³

2010

Journal of Alloys and Compounds

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In situ measurement of lattice parameter change on Pd and Ni during cathodic hydrogen charging

Cited by 9 publications

References 11 publications

X-ray diffraction, scanning electron microscopy and magnetic characterization of hydrogenated Ni–Pd alloys

X-ray diffraction, scanning electron microscopy and magnetic characterization of hydrogenated Ni–Pd alloys

Hydrogenation Behavior of Yttrium Thin-Film Electrode in 1 M NAOH Electrolyte after Removal of Palladium Cap

Strain and resistivity of PdHx at hydrogen composition x>0.8

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