Structure and Electrochemical Characteristics of Ti-V-based Solid Solution/AB5-type La-Mg-based Alloy Composite Hydrogen Storage Material

doi:10.3724/SP.J.1077.2012.00463

Abstract

Abstract:

Composite hydrogen storage alloy Ti_0.10Zr_0.15V_0.35Cr_0.10Ni_0.30 + 5wt% La_0.85Mg_0.25Ni_4.5Co_0.35Al_0.15 was prepared by two-step arc melting. X-ray diffractometry (XRD) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) show that the main phase of the composite alloy consists of V-based solid solution phase with BCC structure and C14 Laves phase with hexagonal structure, while secondary phase also exists in the composite alloy. Electrochemical studies show that distinct synergetic effect appears during the composite process. The real maximum discharge capacity of the composite alloy electrode is 361.8 mAh/g at 303 K, and the low temperature dischargeability (LTD) of the composite alloy electrode is 4.05 times as high as that of the matrix alloy electrode at 233 K. The high rate dischargeability (HRD), the charge–transfer resistance (R_ct) and the exchange current density (I₀) of the composite alloy electrode are 26.87 % bigger, 37.25 mΩ lower and 115.45 mA/g higher than that of the matrix alloy electrode, respectively. The hydrogen diffusion coefficient (D) in the bulk of the composite alloy is 6.13×10^-10cm²/s bigger than that of the matrix alloy.

Key words: Ti-V-based solid solution, composite hydrogen storage alloy, electrochemical characteristics, synergetic effect

CLC Number:

O646
TG139

WANG Yan-Zhi, ZHAO Min-Shou. Structure and Electrochemical Characteristics of Ti-V-based Solid Solution/AB₅-type La-Mg-based Alloy Composite Hydrogen Storage Material[J]. Journal of Inorganic Materials, 2012, 27(5): 463-468.

Figures/Tables 11

Fig. 1 XRD patterns of LMBA, TVS and COM as-cast alloy

Table 1 Lattice parameters of BCC and C14 Laves phase in TVS and COM alloy

Sample	Phase	Lattice parameter		Cell volume /nm³
Sample	Phase	a / nm	c / nm	Cell volume /nm³
TVS alloy	BCC	0.2969	-	0.02617
TVS alloy	C14 Laves	0.4948	0.8093	0.17160
COM alloy	BCC	0.2974	-	0.02630
COM alloy	C14 Laves	0.4943	0.8069	0.17070

Fig. 2 SEM images of COM alloy at different magnification

Table 2 Phase compositions of COM alloy

Phase	Composition / at%
Phase	Ti	Zr	V	Cr	Ni	Mg	Al	Co	La
BCC phase	4.95	10.04	38.03	14.86	7.39	12.02	10.08	2.62	－
C14 Laves phase	26.45	28.54	14.97	2.77	9.56	8.96	7.78	0.98	－
Secondary phase	1.22	29.80	31.54	6.34	9.94	7.49	6.39	1.18	6.10

Fig. 3 Electrochemical desorption P-C-T curve of TVS and COM alloy electrode

Fig. 4 Activation property and maximum discharge capacity of TVS, LMBA and COM alloy electrode

Fig. 5 Curve of discharge capacity vs cycle number for TVS and COM alloy electrode

Table 3 Concentration of main constituent element dissolved in KOH electrolyte for TVS and COM alloy electrode

Constituent element	Concentration in KOH / (mg·L^-1)
	50 cycles		100 cycles
	TVS	COM	TVS	COM
Ti	0.031	0.024	0.084	0.117
Zr	13.524	12.693	27.393	19.742
V	31.052	26.961	74.094	54.263
La	－	－	－	0.003
Mg	－	－	－	0.004

Fig. 6 Dependence of dischargeability on temperature for TVS and COM alloy electrode

Fig. 7 High rate dischargeability of TVS and COM alloy electrode

Fig. 8 Electrochemical impedance spectra of TVS and COM alloy electrode

References 29

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Structure and Electrochemical Characteristics of Ti-V-based Solid Solution/AB₅-type La-Mg-based Alloy Composite Hydrogen Storage Material

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