Effect of surface treatment with boiling alkaline solution on electrochemical properties of the ZrNi alloy electrode

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

doi:10.1016/j.ijhydene.2016.01.033

Cited by 14 publications

(13 citation statements)

References 34 publications

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“…The AB-type ZrNi hydrogen storage alloy is a promising negative electrode active material, because it has the theoretical capacity of 536 mAh g −1 [5], which was higher than that of the AB 5 -or AB 3 -type rare-earth-based commercial alloys [6,7]. We reported on the electrochemical properties of the ZrNi alloy negative electrode before and after the boiling alkaline surface treatment, and its discharge capacity after the treatment was 320 mAh g −1 at 333 K [8]. However, the large difference between the experimental and theoretical specific discharge capacity for the ZrNi alloy negative electrode was attributed to the stability of monohydride (β-ZrNiH) [8,9].…”

Section: Introductionmentioning

confidence: 94%

“…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%

“…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. For the activation treatment, the resultant Zr 0.6−x Ti 0.4 Nb x Ni negative electrodes were soaked in a boiling 6 M KOH alkaline solution for 4 h [8,9]. The positive and reference electrodes were NiOOH/Ni(OH) 2 and Hg/HgO electrodes, respectively.…”

Section: Electrochemical Propertymentioning

confidence: 99%

“…We reported on the electrochemical properties of the ZrNi alloy negative electrode before and after the boiling alkaline surface treatment, and its discharge capacity after the treatment was 320 mAh g −1 at 333 K [8]. However, the large difference between the experimental and theoretical specific discharge capacity for the ZrNi alloy negative electrode was attributed to the stability of monohydride (β-ZrNiH) [8,9].…”

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: Introductionmentioning

confidence: 94%

Section: Electrochemical Propertymentioning

confidence: 99%

Section: Electrochemical Propertymentioning

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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“…15) Briefly, the alloy powder, Cu powder and 10 mass% polyvinyl alcohol aqueous solution were mixed to make a paste, and the resultant paste was cast on a Ni mesh as a current collector. For the activation treatment, the resultant ZrTiNbNi negative electrodes were immersed in a boiling 6 M KOH alkaline solution for 4 h. 12) The positive and reference electrodes were NiOOH/ Ni(OH) 2 and Hg/HgO electrodes, respectively. The electrolyte solution was a 6 M KOH aqueous solution containing 1 M LiOH.…”

Section: Electrochemical Measurements Of the Zrtinbni Electrodesmentioning

confidence: 99%

Effect on Electrochemical Properties of Phases in AB-Type Zr–Ti–Nb–Ni Alloys as Nickel-Metal Hydride Batteries

Matsuyama¹,

Takito²,

Kozuka³

et al. 2019

Mater. Trans.

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AB-type ZrTiNbNi alloys are good candidates as the negative electrode for Ni-metal hydride (MH) batteries because they have high discharge capacity around 330 mAh g ¹1 at 303 K. The Zr 0.49 Ti 0.5 Nb 0.01 Ni alloy consists of two phases, the primary-phase with B33-type orthorhombic structure and the secondary-phase with B2-type cubic structure. To compare electrochemical properties of each phase with the mother alloy, we synthesized the primary-phase and secondary phase alloys with compositions of Zr 0.54 Ti 0.47 Nb 0.01 Ni 0.98 and Zr 0.47 Ti 0.52 Nb 0.01 Ni, respectively. The discharge capacity was examined at 25 mA g ¹1 and 303 K, showing that the primary-phase alloy has the highest value of 362 mAh g ¹1 than the mother alloy (335 mAh g ¹1 ) and the secondary-phase alloy (253 mAh g ¹1 ). For cycle performance, all alloys were excellent (½95%) at 100 mA g ¹1 and 303 K. For high-rate dischargeability, the secondary-phase alloy was the best, probably because the stability of hydride for the secondary-phase alloy was lower than that for the mother and the primary-phase alloy.

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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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Effect of surface treatment with boiling alkaline solution on electrochemical properties of the ZrNi alloy electrode

Cited by 14 publications

References 34 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

Effect on Electrochemical Properties of Phases in AB-Type Zr–Ti–Nb–Ni Alloys as Nickel-Metal Hydride Batteries

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

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Effect of surface treatment with boiling alkaline solution on electrochemical properties of the ZrNi alloy electrode

Cited by 14 publications

References 34 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

Effect on Electrochemical Properties of Phases in AB-Type Zr–Ti–Nb–Ni Alloys as Nickel-Metal Hydride Batteries

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

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