Effect of V and Zr on the electrochemical properties of La-based AB5-type metal hydride electrodes

Seo, Chan-Yeol; Choi, Seung-Jun; Choi, Jong‐Woo; Park, Chan‐Jin; Lee, Jun Young

doi:10.1016/s0925-8388(02)01042-3

Cited by 29 publications

(12 citation statements)

References 12 publications

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“…3. Similar phenomenon appeared in the research results of Seo et al [15]. As the content of Fe increasing, a little web-like new LaNi 2.28 phase appeared on the matrix of the alloy (x = 0.5), the compositions of each phase are listed in Table 2.…”

Section: Methodssupporting

confidence: 86%

Microstructures and electrochemical properties of Co-free AB5-type hydrogen storage alloys through substitution of Ni by Fe

Wei

Liu

Dong

et al. 2007

Electrochimica Acta

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Section: Methodssupporting

confidence: 86%

Microstructures and electrochemical properties of Co-free AB5-type hydrogen storage alloys through substitution of Ni by Fe

Wei

Liu

Dong

et al. 2007

Electrochimica Acta

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“…Fig. 3 and Table 2, it is certain that the new specimen is of a Zr-rich phase and its main components are Zr, V and Ni with a small quantity of other elements, including La, Al, Cr, Ti, Co, Mn, which disagrees with the reported result that La is not soluble in alloying elements of AB 2 -type metal hydride except Ni [19]. Figure 4 illustrates the discharge capacity versus cycle number of TVS ?…”

Section: Resultsmentioning

confidence: 73%

“…But with the presence of other phases in the V-based alloys such as TiNi phase or C14 Laves, which acts as a catalyst or a micro-current collector, the V-based solid solution phase will be activated to absorb and desorb reversibly a considerable amount of hydrogen in KOH electrolyte. As mentioned above, the amount of the new specimen in the composite alloys increases with x, and furthermore, it may form active sites and pathways for hydrogen diffusion [6,13,19]. In addition, the phase boundaries increase with the number of phases, and diffusion through grain boundaries with open structure is easier than that in grains with a perfect lattice structure [20].…”

Section: Resultsmentioning

confidence: 99%

Effect of AB5 alloy on Ti0.10Zr0.15V0.35Cr0.10Ni0.30 hydrogen storage alloy

2009

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The structure and electrochemical characteristics of melted composite Ti 0.10 Zr 0.15 V 0.35 Cr 0.10 Ni 0.30 ? x% LaNi 4 Al 0.4 Mn 0.3 Co 0.3 (x = 0, 1, 5) hydrogen storage alloys have been investigated systematically. XRD shows that though the main phase of the matrix alloy remains unchanged after LaNi 4 Al 0.4 Mn 0.3 Co 0.3 alloy is added, a new specimen is formed. The amount of the new specimen increases with increasing x. SEM-EDS analysis indicates that the V-based solid solution phase is mainly composed of V, Cr and Ni; C14 Laves phase is mainly composed of Ni, Zr and V; the new specimen containing La is mainly composed of Zr, V and Ni. The electrochemical measurements suggest that the activation performance, the low temperature discharge ability, the high rate discharge ability and the cyclic stability of composite alloy electrodes increase greatly with the growth of x. The HRD is controlled by the charge-transfer reaction of hydrogen and the hydrogen diffusion in the bulk of the alloy under the present experimental conditions. Keywords Composite alloy Á Hydrogen storage alloys Á V-based solid solution alloy Á Metal hydride electrode Á Electrochemical characteristicsList of symbols XRD X-ray diffraction SEM Scanning electron microscopy EDS Energy-dispersive spectrometer C max Maximum discharge capacity (mAh g -1 ) C n Discharge capacity at cycle number n (mAh g -1 ) S n Capacity retention at cycle number n C T Discharge capacity at certain temperature (mAh g -1 ) C 303 Discharge capacity at 303 K (mAh g -1 ) LTD Low temperature discharge ability HTD High temperature discharge ability HRD High-rate dischargeability C i Discharge capacity at different discharge rate (mAh g -1 ) C 60 Discharge capacity at both the charge/discharge current density of 60 mA g -1 (mAh g -1 ) DOD Depth of discharge (%) EIS Electrochemical impedance spectroscopy R ct Charge-transfer resistance (mX) I 0 Exchange current density (mA g -1 ) R Gas constant (J mol -1 K -1 ) T Absolute temperature (K) FFaraday constant (C mol -1 ) D Hydrogen diffusion coefficient (cm 2 s -1 )

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“…2, the X-ray diffraction pattern of the alloy is shown. This pattern can be indexed well assuming the CaCu 5 -type structure with hexagonal symmetry and the P6/mmm space group [12,13]. It can be seen that all diffraction peaks correspond to the typical AB 5 -type alloy structure.…”

Section: Metallurgical Characterizationmentioning

confidence: 69%

Effect of electrolyte concentration on the electrochemical properties of an AB5-type alloy for Ni/MH batteries

Ruiz

Martínez

Castro

et al. 2013

International Journal of Hydrogen Energy

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Effect of V and Zr on the electrochemical properties of La-based AB5-type metal hydride electrodes

Cited by 29 publications

References 12 publications

Microstructures and electrochemical properties of Co-free AB5-type hydrogen storage alloys through substitution of Ni by Fe

Microstructures and electrochemical properties of Co-free AB5-type hydrogen storage alloys through substitution of Ni by Fe

Effect of AB5 alloy on Ti0.10Zr0.15V0.35Cr0.10Ni0.30 hydrogen storage alloy

Effect of electrolyte concentration on the electrochemical properties of an AB5-type alloy for Ni/MH batteries

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