Electrochemical study of mono-substituted and poly-substituted intermetallic hydrides

Mathlouthi, H.; Khaldi, Chokri; Moussa, M. Ben; Lamloumi, J.; Percheron-Guégan, A.

doi:10.1016/j.jallcom.2003.12.003

Cited by 57 publications

(32 citation statements)

References 18 publications

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“…Extrapolating the temperature dependence of D H , reported by Schmidt et al [17] for NiTi alloy in the temperature range 500-950°C, a value of 3.2 9 10 -11 cm 2 s -1 was determined for the diffusion coefficient of hydrogen at room temperature, which is very close to that determined in the present study. Similar D H -values, determined by electrochemical impedance spectroscopy (EIS), were reported by Mathlouthi et al [22] for LaNi4Fe (2.7 9 10 -10 cm 2 s -1 ), 1. Whereas annealing of the as-milled nanocrystalline materials at 500°C results only in slight coarsening of the nanostructure, annealing at 530°C leads to crystallization of the amorphous phase formed during milling.…”

Section: Hydrogen Diffusivity In As-milled and Annealed Tinisupporting

confidence: 86%

Influence of alloying and microstructure on the electrochemical hydriding of TiNi-based ternary alloys

2007

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Nanostructured ternary TiNi-type alloys, namely Ti 0.8 M 0.2 Ni (M = Zr, V), TiNi 0.8 N 0.2 (N = Cu, Mn) and TiNi 1-x Mn x (x = 0.2, 0.4, 0.6, 1.0), were synthesized by mechanical alloying. Depending on the intensity and time of milling alloys with different microstructure were obtained. The as-milled TiNi 1-x Mn x alloys contain substantial amount of amorphous phase, which crystallizes during annealing. Annealing of the as-milled fine nanocrystalline materials at 500°C results only in slight coarsening of the microstructure, which remains still nanocrystalline. Fully crystalline material (with crystal size larger than 50 nm), consisting of mainly cubic TiNi was obtained by annealing the ball-milled alloys at T C 700°C. Electrochemical hydrogen charge/discharge cycling of the as-milled as well as of annealed alloys were carried out at galvanostatic conditions. It was found that among the nanocrystalline Ti 0.8 M 0.2 Ni 0.8 N 0.2 (M = Zr, V; N = Cu, Mn) alloys TiNi 0.8 Mn 0.2 revealed the highest discharge capacity of 56 mAh g -1 in the as-milled state and 75 mAh g -1 after short-time annealing at 500°C. Annealing at higher temperature does not increase the capacity further. The as-milled TiNi 1-x Mn x alloys with x B 0.4 reveal noticeably higher discharge capacity and better cycle life than the Mn-richer alloys. Based on potentiostatic experiments the diffusion coefficients of hydrogen into TiNi alloys in two different microstructural states (fine and coarser nanocrystalline) as well as in as-milled amorphous/nanocrystalline and nanocrystalline TiNi 0.8 Mn 0.2 were determined. The hydrogen diffusion coefficients of the TiNi alloys are comparable (1.9-2.7 9 10 -12 cm 2 s -1 ). The diffusion coefficient in the as-milled amorphous/nanocrystalline TiNi 0.8 Mn 0.2 was found to be 3-4 times higher than that of the as-milled nanocrystalline alloy.

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Section: Hydrogen Diffusivity In As-milled and Annealed Tinisupporting

confidence: 86%

Influence of alloying and microstructure on the electrochemical hydriding of TiNi-based ternary alloys

2007

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“…At low frequencies, the impedance value of the Mm containing electrode is greater than that of the La containing electrode. This result indicates that in the KOH electrolyte, the Mm alloy presents at the surface a corrosion layer, which is thicker than for the La containing alloy [8,11].…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

“…Based on the impedance modelling of the kinetic of the metal hydride electrode [11,12], several works attributed the formation of the semicircle at the high frequency to the transfer reaction, which depends on the electrode type. So, based on this semicircle, we can determine the charge transfer resistance R tc , the electrolyte resistance R 0 and the double layer capacitance C dl .…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

“…Different techniques have been proposed for the evaluation of the kinetic process in the hydrogen storage alloys. These have included the cyclic voltammetry [3,10,14], the chronoamperometry 0925 [6,7,11,[22][23][24] and the electrochemical impedance spectroscopy [2,10,12,[15][16][17][18][19][20][21]24] methods. For various AB 5 -type alloys, the variation of the kinetic parameters is due to the differences in the alloys composition, the alloying process and also the hydrogen concentration in the alloys [24].…”

Section: Introductionmentioning

confidence: 99%

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Effect of substitution of Mm for La on the electrochemical properties of the LaNi3.55Mn0.4Al0.3Co0.75 compound

Moussa¹,

Abdellaoui²,

Khaldi³

et al. 2005

Journal of Alloys and Compounds

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“…Recently, EIS is considered as a useful tool to research the surface corrosion of the metal hydride electrodes [29,33]. While oxide film or corrosion layer is formed on the surface of alloy particles, the rate of reaction would be influenced correspondingly by this surface layer.…”

Section: Electrochemical Performancementioning

confidence: 99%

Effects of Al content on the electrochemical properties of La0.78Ce0.22Ni3.95-xCo0.65Mn0.3Si0.1Alx alloys at 20–80 °C

Zhou

Zhu

Wang

et al. 2015

International Journal of Hydrogen Energy

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Electrochemical study of mono-substituted and poly-substituted intermetallic hydrides

Cited by 57 publications

References 18 publications

Influence of alloying and microstructure on the electrochemical hydriding of TiNi-based ternary alloys

Influence of alloying and microstructure on the electrochemical hydriding of TiNi-based ternary alloys

Effect of substitution of Mm for La on the electrochemical properties of the LaNi3.55Mn0.4Al0.3Co0.75 compound

Effects of Al content on the electrochemical properties of La0.78Ce0.22Ni3.95-xCo0.65Mn0.3Si0.1Alx alloys at 20–80 °C

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