Enhanced electrochemical properties of ball-milled Ti–30V–15Mn–15Cr+20 wt% La(NiMnCoAl)5 alloy electrodes

Yu, Xuebin; Li, F.; Wu, Zhong‐Shuai; Xia, Baojia; Xu, Na

doi:10.1016/j.physleta.2003.11.030

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…became broader and the CaCu 5 phase disappeared. It suggests that the LaNi 3.55 Co 0.75 Mn 0.4 Al 0.3 alloy was crushed into a highly dispersed or amorphous structure, which was similar to the previous observations on BCC/AB 5 system [12][13][14].…”

Section: Resultssupporting

confidence: 88%

“…Our previous studies on the electrochemical performance of Ti-Mn-Cr-V alloys have demonstrated that surface modification with AB 5 alloy can prohibit the dissolution of V in the electrolyte and thus improve the electrochemical activities [12][13][14]. Therefore, it may be expected that this route would be effective on improving the cycle life of the Ti 0.32 Mn 0.22 Cr 0.1 V 0.28 Ni 0.15 alloy.…”

Section: Resultsmentioning

confidence: 99%

“…Further studies revealed that addition of Nb and Co to the alloy effectively improved the cycle stability without considerable decreasing in initial capacity and without much degradation of initial activation characteristics [10]. In addition, surface modification with Ni powder [11] or AB 5 -type alloys [12][13][14][15][16] can also improve the discharge capacity and cycle life of BCC alloy greatly.…”

Section: Introductionmentioning

confidence: 95%

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Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy

Tiesheng

2009

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy

Tiesheng

2009

Journal of Alloys and Compounds

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“…以往相关研究结果基本一致 [16][17]21] 图 8 合金与球磨产物电极的线性极化曲线 Fig. 8 Linearpolarizationcurvesofthealloyand ball鄄milledcompositeelectrodes 图 9 合金与球磨产物电极的循环伏安曲线 Fig.…”

Section: 研究表明钒基合金的电化学稳定性一般与合金中unclassified

“…为了进一步改善钒基储氢合金的电化学反应动力学和电极循环寿命, 国内外研究者在钒基合金的合金化、材料复合以及表面改性方面开展了一些研究 [10][11][12][13][14][15] . 文献 [16][17][18][19]报道了用机械球磨改性方法研究了钒基合金与稀土系 AB 5 及 A 2 B 7 型复合材料的电化学性能, 但改性后的复合材料电极容量不高或循环稳定性仍不理想. 我们前期工作 [20][21] No.9 罗永春等：球磨改性对(TiCr) 0.497 V 0.42 Fe 0.083 /30%(w)(LaRMg)(NiCoAl) 3.5 合金复合电极材料储氢和电化学性能的影响低至 1.81%(w).…”

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Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)0.497V0.42Fe0.083/30%(w) (LaRMg)(NiCoAl)3.5 Alloy Electrodes

Luo¹,

Zhang²,

Wang³

et al. 2010

Acta Physico-Chimica Sinica

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晶组织并伴有部分非晶化倾向, 同时钒基合金 BCC 相结构的晶胞参数 a 和晶胞体积 V 均明显减小. 合金储氢特性及电化学性能分析测试结果表明, 铸态纯钒基合金的吸氢量为 3.11%(w), 而球磨复合材料的储氢量随球磨时间增加呈减小的规律, 其最大储氢量为 2.47%(w); 球磨改性后, 复合材料电极的电催化性能得到明显改善, 当球磨时间 t逸3h时最大放电容量达到 425.8mAh•g -1 , 经 100 次充放电循环后该电极的容量保持率(C 100 /C max )为 97%, 表现出良好的电极循环稳定性.

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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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Enhanced electrochemical properties of ball-milled Ti–30V–15Mn–15Cr+20 wt% La(NiMnCoAl)5 alloy electrodes

Cited by 10 publications

References 12 publications

Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy

Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy

Influence of Ball-Milling on Hydrogen Storage and Electrochemical Properties of (Ti Cr)<sub>0.497</sub>V<sub>0.42</sub>Fe<sub>0.083</sub>/30%(w) (LaRMg)(NiCoAl)<sub>3.5</sub> Alloy Electrodes

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

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