Pressure–composition–temperature hysteresis in C14 Laves phase alloys: Part 1. Simple ternary alloys

Young, K.; Ouchi, T.; Fetcenko, M.A.

doi:10.1016/j.jallcom.2008.12.113

Cited by 82 publications

(63 citation statements)

References 61 publications

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“…3b). Therefore, a flattened and an elongated unit cell along the c-axis are preferable for the ease of proton movement in AB 2 and AB 5 metal hydride (MH) alloys, respectively (Osumi, et al, 1983, Young, et al, 2009b. The process of hydride formation can be described by the pressure-concentrationtemperature (PCT) curves shown in Fig.…”

Section: Metal Hydride Alloysmentioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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Section: Metal Hydride Alloysmentioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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“…This finding suggests a decrease in uniformity with the addition of boron and is consistent with the decrease in the main C14 phase abundance. Hysteresis of PCT isotherm, defined as the natural log of ratio between the absorption and desorption equilibrium pressures [39][40][41], can be used to predict the degree of pulverization through cycling [28,37,42,43]. In the current study, hysteresis is listed in the sixth column in Table 4 and does not change significantly as the boron content increases.…”

Section: Pct Analysismentioning

confidence: 91%

“…Compared to the AB 5 MH alloy, the highly disordered AB 2 MH alloy has a relatively slanted isotherm without an easily defined plateau region [31][32][33][34][35][36]. Instead, the desorption pressure at 0.75 wt % is introduced as an indicator for the plateau pressure and used in the calculations of hysteresis, heat of hydride formation (∆H h ), and entropy change (∆S h ) [37]. Table 4 shows the gaseous phase H-storage properties obtained from the PCT isotherms.…”

Section: Pct Analysismentioning

confidence: 99%

Effects of Boron-Incorporation in a V-Containing Zr-Based AB2 Metal Hydride Alloy

Chang

Kim

Ouchi³

et al. 2017

Batteries

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Abstract:In this study, boron, a metalloid element commonly used in semiconductor applications, was added in a V-containing Zr-based AB 2 metal hydride alloy. In general, as the boron content in the alloy increased, the high-rate dischargeability, surface exchange current, and double-layer capacitance first decreased and then increased whereas charge-transfer resistance and dot product of charge-transfer resistance and double-layer capacitance changed in the opposite direction. Electrochemical and gaseous phase characteristics of two boron-containing alloys, with the same boron content detected by the inductively coupled plasma optical emission spectrometer, showed significant variations in performances due to the difference in phase abundance of a newly formed tetragonal V 3 B 2 phase. This new phase contributes to the increases in electrochemical high-rate dischargeability, surface exchange current, charge-transfer resistances at room, and low temperatures. However, the V 3 B 2 phase does not contribute to the hydrogen storage capacities in either gaseous phase and electrochemical environment.

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“…Only small deviations in the Mn-content were found, due to the Mn overcompensation in the case of evaporation loss. The average electron density (e/a), an important factor determining the ratio of C14 to C15 phase abundances [116][117][118][119][120], is calculated from the constituent elements' numbers of outer-shell electrons. Since Pd has more outer-shell electrons (10), compared to the replaced Zr (4), e/a increases with increasing Pd.…”

Section: Properties Of Pdmentioning

confidence: 99%

“…% H-storage) and listed in Table 6. PCT hysteresis is commonly accepted as correlating to the energy needed to overcome the reversible lattice expansion in the metal (the αphase)/MH (the βphase) phase boundary during hydrogen absorption [119]. The catalytic TiNi phase facilitates the hydrogen absorption in the storage phase by pre-expanding the lattice near the interface and thus decreasing the energy needed to propagate hydrogen through the bulk [133].…”

Section: Pct Analysismentioning

confidence: 99%

Increase in the Surface Catalytic Ability by Addition of Palladium in C14 Metal Hydride Alloy

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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A combination of analytic tools and electrochemical testing was employed to study the contributions of Palladium (Pd) in a Zr-based AB 2 metal hydride alloy (Ti 12 Zr 22.8 V 10 Cr 7.5 Mn 8.1 Co 7 Ni 32.2 Al 0.4 ). Pd enters the A-site of both the C14 and C15 Laves phases and shrinks the unit cell volumes, which results in a decrease of both gaseous phase and electrochemical hydrogen storage capacities. On the other hand, the addition of Pd benefits both the bulk transport of hydrogen and the surface electrochemical reaction. Improvements in high-rate dischargeability and low-temperature performances are solely due to an increase in surface catalytic ability. Addition of Pd also decreases the surface reactive area, but such properties can be mediated through incorporation of additional modifications with rare earth elements. A review of Pd-addition to other hydrogen storage materials is also included.

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Pressure–composition–temperature hysteresis in C14 Laves phase alloys: Part 1. Simple ternary alloys

Cited by 82 publications

References 61 publications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Effects of Boron-Incorporation in a V-Containing Zr-Based AB2 Metal Hydride Alloy

Increase in the Surface Catalytic Ability by Addition of Palladium in C14 Metal Hydride Alloy

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