Effect of Ti substitution on electrochemical properties of ZrNi alloy electrode for use in nickel-metal hydride batteries

Matsuyama, Akihiro; Mizutani, Hironori; Kozuka, Takumi; Inoue, Hiroshi

doi:10.1016/j.ijhydene.2017.03.119

Cited by 8 publications

(17 citation statements)

References 22 publications

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“…The Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) alloys were prepared according to the previous method [12,13]. Briefly, an ingot of each alloy was prepared by arc-melting a mixture of element constituents (Zr wire-cut rod 99.0%, Ti powder 99.0%, Nb powder 99.9%, and Ni powder 99.9% purities, Kojundo Chemical Laboratory Co, LTD., Sakado, Japan) in a water-cooled copper mold in an Ar atmosphere.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) negative electrodes were prepared according to the previous method [8,9,13]. Briefly, the Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) powders (42.5 mg), Cu powders (5 mg), and 10 mass% polyvinyl alcohol aqueous solution (25 µL) were mixed to make a paste, and the paste was filled into a Ni mesh as a current collector.…”

Section: Electrochemical Propertymentioning

confidence: 99%

“…For the alloys with x ≥ 0.3, the discharge reaction of the monohydride to alloy partially proceeded, leading to the increase in the total discharge capacity. Moreover, the alloy with x = 0.4 exhibited the maximum discharge capacity of 349 mAh g −1 at 333 K [13]. Thus, the lattice shrinkage for the Zr 1−x Ti x Ni (0.05 ≤ x ≤ 0.5) alloys also caused the destabilization of their hydrides.…”

Section: Introductionmentioning

confidence: 98%

“…Recently, we have reported on the ternary AB-type Zr 1−x Ti x Ni (0.05 ≤ x ≤ 0.5) alloys, in which the Zr constituent was partially replaced with Ti whose atomic radius is smaller than Zr (r Zr = 1.60 Å and r Ti = 1.47 Å), and have assessed their crystallographic, thermodynamic and electrochemical properties [12,13]. With an increase in the Ti content, the hydrides were destabilized due to the reduction of the unit cell volume of the primary phase.…”

Section: Introductionmentioning

confidence: 99%

“…4 Ni alloy was chosen as a fundamental alloy because it exhibited the best negative electrode performances in our previous study [13], and Nb was substituted for the Zr constituent. The effect of the Nb substitution on the crystal structure, hydrogen absorption, and electrochemical properties of the Zr 0.6 Ti 0.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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Abstract:Crystal structure, pressure-composition isotherms and electrochemical properties of the Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) alloys were investigated. Their X-ray diffraction profiles demonstrated that all the Zr 0.6−x Ti 0.4 Nb x Ni alloys consisted of the primary phase with the B33-type orthorhombic structure and the secondary phase with the B2-type Ti 0.6 Zr 0.4 Ni cubic structure. Rietveld refinement demonstrated that the atomic fraction of the secondary phase increased with the Nb content. The Zr 0.6−x Ti 0.4 Nb x Ni alloys were lower in hydrogen storage capacity than the Nb-free Zr 0.6 Ti 0.4 Ni alloy due to an increase in the abundance of the secondary phase. In the charge-discharge tests with the Zr 0.6−x Ti 0.4 Nb x Ni alloy negative electrodes, all the initial discharge curves had two potential plateaus due to the electrochemical hydrogen desorption of trihydride to monohydride and monohydride to alloy of the primary phase. The total discharge capacities at 333 and 303 K for the Zr 0.58 Ti 0.4 Nb 0.02 Ni alloy negative electrode were 384 and 335 mAh g −1 , respectively, which were higher than those of the other Zr 0.6−x Ti 0.4 Nb x Ni and Zr 0.6 Ti 0.4 Ni alloy negative electrodes.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Electrochemical Propertymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃

Rkhis¹,

Alaoui‐Belghiti²,

Laasri³

et al. 2020

Int J Energy Res

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Summary The effect of Zr substitution by alkaline earth metals Mg, Be and post‐transition metal Al on the evolution of hydrogen storage properties of ZrNiH3 has been investigated by ab‐initio calculations based on density functional theory. The stability of the quaternary hydrides is studied by the determination of the formation enthalpy and the desorption temperature. The obtained results indicate a reduction of the formation enthalpy as well as the desorption temperature, hence reflecting the enhancement of hydrogen storage properties of ZrNiH3. Interestingly, each dopant (Mg, Be and Al) achieved its optimum substitution effect at a particular concentration, with Al and Be elements are found to exhibit the lowest substituting content ~17% and ~23% respectively and Mg with the highest concentration ~85%, to achieve an ideal formation enthalpy (ΔH = −40 kJ/mol.H2) and desorption temperatures (289 to 393 K), as required for practical use of proton exchange membrane fuel cells (PEMFC) without affecting the hydrogen storage capacity as seen in pure ZrNiH3.Moreover, the electronic structure investigated by partial density of states (PDOS), reveals the metallic nature of Zr1−xAMxNiH3 (AM = Mg, Be and Al) hydrides. Highlights The ZrNiH3 hydride presents high stability and high decomposition temperature. The stability decreases significantly when doping ZrNiH3 with Mg, Be and Al. The density of states reveals the metallic nature of Zr1−xAMxNiH3 hydrides.

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Texture dependence of hydrogen diffusion in nanocrystalline nickel by atomistic simulations

Mohammadzadeh

2018

International Journal of Hydrogen Energy

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Effect of Ti substitution on electrochemical properties of ZrNi alloy electrode for use in nickel-metal hydride batteries

Cited by 8 publications

References 22 publications

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃

Texture dependence of hydrogen diffusion in nanocrystalline nickel by atomistic simulations

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Effect of Ti substitution on electrochemical properties of ZrNi alloy electrode for use in nickel-metal hydride batteries

Cited by 8 publications

References 22 publications

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH 3

Texture dependence of hydrogen diffusion in nanocrystalline nickel by atomistic simulations

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Dependence of Mg, Be and Al substitution on the hydrogen storage characteristics of ZrNiH ₃