共查询到20条相似文献,搜索用时 15 毫秒
1.
Peng Lv Zhong-min Wang Ying Peng Wen-ping Liu Muhammad-Sadeeq Balogun Huai-ying Zhou 《Journal of Solid State Electrochemistry》2014,18(9):2563-2572
The effect of Cu content on structure, hydrogen storage, and electrochemical properties of LaNi4.1-x Co0.6Mn0.3Cu x alloys has been investigated. For sample, A, B, C, and D are used to represent alloys (x?=?0, 0.15, 0.3, and 0.45), respectively. The results indicate that the four alloys are all single-phase alloy with LaNi5 phase of CaCu5 hexagonal structure, the hydrogen storage capacities of the alloy are about 1.49 wt% (A), 1.48 wt% (B), 1.43 wt% (C), and 1.25 wt% (D) at 303 K. With the increase of Cu content (x) from A to D, hydrogen desorption plateau pressure and pressure hysteresis decrease. Alloy electrode A shows better activation property and higher capacity (334.44 mAh/g). The addition of Cu improves the cyclic stability of the alloy electrodes when x?=?0?~?0.45. However, their self-discharge properties and high-rate dischargeability (HRD) decrease with the increase of x. Further, electrochemical kinetics and electrochemical impedance spectroscopy (EIS) analysis show that the reaction of alloy electrode is controlled by charge transfer step, and the adding of Cu benefits the electrode properties in alkaline solution. 相似文献
2.
Zhi-Jie Gao Yong-Chun Luo Zhen Lin Rong-Feng Li Jian-Yi Wang Long Kang 《Journal of Solid State Electrochemistry》2013,17(3):727-735
Hydrogen storage alloys La0.63Gd0.2?Mg0.17Ni3.35?x Co x Al0.15 (x?=?0, 0.1, 0.3, 0.5, 1.0, 1.5, 2.0) were prepared by induction melting followed by annealing treatment in argon atmosphere. The electrochemical properties of La0.63Gd0.2?Mg0.17Ni3.35?x Co x Al0.15 (x?=?0, 0.1, 0.3, 0.5, 1.0, 1.5, 2.0) alloy electrodes depended on the alloy structure type. XRD patterns and EPMA showed that the alloys consisted of Ce2Ni7-type (Gd2Co7-type), CaCu5-type, Pr5Co19-type, and PuNi3-type phase structure. Pr5Co19-type and Ce2Ni7-type phase increased with the increase of Co content x. However, CaCu5-type phase firstly decreased then increased as Co content increased. Rietveld analysis showed that the c-axis lattice parameters and cell volumes of the component phases increased with increasing Co content. The electrochemical measurements showed that as the Co content increased, the maximum discharge capacity and the cyclic stability of the annealed alloys both first increased and then decreased. The La0.63Gd0.2?Mg0.17Ni3.05Co0.3Al0.15 alloy electrode exhibited the maximum discharge capacity (392.92 mAh/g), and La0.63Gd0.2?Mg0.17Ni1.85Co1.5Al0.15 alloy electrode showed the best cyclic stability (S100?=?96.1 %). The electrochemical kinetics studies indicate that La0.63Gd0.2?Mg0.17Ni1.85Co1.5Al0.15 exhibited a higher rate dischargeability (HRD900?=?86.3 %). Electrochemical analyses showed that the control process of alloy electrode reaction is charge-transfer rate in surface film of alloy. 相似文献
3.
Dabaki Youssef Khaldi Chokri ElKedim Omar Fenineche Nouredine Lamloumi Jilani 《Journal of Solid State Electrochemistry》2022,26(2):457-468
Journal of Solid State Electrochemistry - In this paper, we study systematically the effect of ball/powder weight ratio on the morphological, structural, and electrochemical properties of... 相似文献
4.
Shumin Han Yuan Li Zhong Zhang Xilin Zhu Jinhua Li Lin Hu 《Frontiers of Chemistry in China》2009,4(1):48-51
The Ml-Mg-Ni-based (Ml = La-rich mixed lanthanide) hydrogen storage alloy Ml0.88Mg0.12Ni3.0-Mn0.10Co0.55Al0.10 was prepared by inductive melting. The micro-structure was analyzed by XRD and SEM. The alloy consists mainly of CaCu5-type phase, Ce2Ni7-type phase and Pr5Co19-type phase. The electrochemical measurements show that the maximum discharge capacity is 386 mAh/g, 16.3% higher than that
of the commercial AB5-type alloy (332 mAh/g). At discharge current density of 1 100 mA/g, high rate dischargeability is 62%, while that of the
AB5-type alloy is only 45%. The discharge capacity decreases to 315 mAh/g after 300 charge/ discharge cycles, 81.5% of the
maximum discharge capacity.
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Translated from Journal of Xi’an Jiao Tong University, 2008, 42(3) (in Chinese) 相似文献
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6.
Konik P. A. Berdonosova E. A. Meshcheryakova E. V. Klyamkin S. N. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2020,94(5):1007-1010
Russian Journal of Physical Chemistry A - The influence of mechanical activation in a high energy planetary ball mill on hydrogen sorption and structural properties of intermetallic compound... 相似文献
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B. Hosni N. Fenineche O. ElKedim C. Khaldi J. Lamloumi 《Journal of Solid State Electrochemistry》2018,22(1):17-29
The binary TiFe alloy was synthesized by mechanical alloying (MA) under argon atmosphere at room temperature. The effect of ball to powder weight ratio on the microstructures was characterized by X-ray diffraction (XRD). The effect of milling time on the electrochemical and activation properties was investigated by scanning electron microscope (SEM), galvanostatic charging and discharging, constant potential discharge, and potentiodynamic polarization techniques. Relationships between electrochemical properties, such as polarization, variation of electrochemical discharge capacity, \( \frac{D_{\mathrm{H}}}{a^2} \) ratio exchange current density, and Nernst potential and alloy compositions were evaluated. XRD results showed that with increasing ball to powder weight ratio, the amorphization process is accelerating and powders milled with a ratio of 1:8 have the highest conversion rate to TiFe. SEM observations reveal that particles show cleavage fracture morphology and size distribution is generally normalized. TiFe milled during 40 h was easily activated within 5 cycles and showed the best discharge capacity equal to 147 mAh g?1. A good cycling was observed after 20 cycles at ambient temperature for the alloy milled for 30 h. A correlation between alloy composition, \( \frac{D_{\mathrm{H}}}{a^2} \) report, exchange current density, and Nernst potential on one hand and the variation of the electrochemical discharge capacity during cycling for different milling times on the other hand was observed. 相似文献
9.
Daryani Mohammad Kazemzad Mahmood Ebadzadeh Touradj Kaflou Ali 《Journal of the Iranian Chemical Society》2019,16(12):2707-2717
Journal of the Iranian Chemical Society - In order to investigate the hydrogen storage properties of cerium-rich RE-based alloys, series of MmNi5 and Mm(1−x)PrxNi3.55Co0.75Mn0.4Al0.3... 相似文献
10.
Li Yunjiao Chang Shenghong Zheng Junchao Zhang Dianwei Yang Jiachao Chen Yongxiang Guo Jia Zhu Jie Xiong Yike Li Wei 《Journal of Solid State Electrochemistry》2020,24(4):863-872
Journal of Solid State Electrochemistry - In this paper, the dual-modified LiNi0.8Co0.1Mn0.1O2 via Gd2O3 is successfully obtained by the solid-state method. The phenomenon of Li/Ni cation mixing... 相似文献
11.
Xinbo Zhang Danzi Sun Wenya Yin Yujun Chai Minshou Zhao 《Journal of Solid State Electrochemistry》2006,10(4):236-242
This paper presents results concerning structure and electrochemical characteristics of the La0.67Mg0.33 (Ni0.8Co0.1Mn0.1)
x
(x=2.5–5.0) alloy. It can be found from the result of the Rietveld analyses that the structures of the alloys change obviously
with increasing x from 2.5 to 5.0. The main phase of the alloys with x=2.5–3.5 is LaMg2Ni9 phase with a PuNi3-type rhombohedral structure, but the main phase of the alloys with x=4.0–5.0 is LaNi5phase with a CaCu5-type hexagonal structure. Furthermore, the phase ratio, lattice parameter and cell volume of the LaMg2Ni9phase and the LaNi5 phase change with increasing x. The electrochemical studies show that the maximum discharge capacity increases from 214.7 mAh/g
(x=2.5) to 391.1 mAh/g (x=3.5) and then decreases to 238.5 mAh/g (x=5.0). As the discharge current density is 1,200 mA/g, the high rate dischargeability (HRD) increases from 51.1% (x=2.5) to 83.7% (x=3.5) and then decreases to 71.6% (x=5.0). Moreover, the exchange current density (I
0) of the alloy electrodes first increases and then decrease with increasing x from 2.5 to 5.0, which is consistent with the variation of the HRD. The cell volume reduces with increasing x in the alloys, which is detrimental to hydrogen diffusion and accordingly decreases the low-temperature dischargeability
of the alloy electrodes. 相似文献
12.
《Electrochemistry communications》2007,9(5):925-929
The alloys Co2B were prepared by two ways of high temperature solid phase process and arc melting, the structure of the alloys was characterized by XRD and SEM. It showed that it was structure of tetragonal Co2B.The electrochemical experimental results demonstrated that the Co2B prepared by two means both showed excellent cycling stability. The initial discharge capacity of Co2B prepared by the high temperature solid phase process was 480.3 mA h g−1, there was no distinct declination after 70 charge–discharge cycles and the capacity kept about 195 mA h g−1. Co2B prepared by the high temperature solid phase process showed very good electrochemical reversibility in CV curves. The hydrogen storage mechanism was also discussed, it confirmed that the high initial capacity of Co2B prepared by the high temperature solid phase process was due to the oxidation of Co and B2O3, and it was irreversible. 相似文献
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本文通过XRD、SEM、EDS研究了Ti0.4Zr0.1V1.1Mn0.5Cr0.1Nix(x=0,0.2,0.4,0.6,0.8)合金的相结构和电化学性能.该合金系由BCC结构的V基固溶体主相和六方结构的C14 Laves第二相组成,Ni能够促进第二相的生成,Ni含量的增加导致了各相中的化学组成和晶格参数的变化,并通过电化学方法研究了Ni含量对Ti0.4Zr0.1V1.1Mn0.5Cr0.1合金电极的最大放电容量、自放电性能、高倍率放电性能、循环稳定性能等的影响. 相似文献
15.
The electrochemical hydrogen storage properties and mechanisms of the Ti55V10Ni35 quasicrystal + xLiH(x = 3, 6 and 9 wt.%) system are investigated and discussed in this paper. A composite material in the Ti55V10Ni35 quasicrystal and system has been synthesized moderately by means of mechanical milling under an argon atmosphere, which can avoid reaction of releasing of hydrogen during the process of milling. The results indicate that the addition of LiH significantly improves the electrochemical characteristics of composite material. The maximum discharge capacity increases from 220.1 mAh/g to 292.3 mAh/g on Ti55V10Ni35 + 6 wt.% LiH, and the cycling stability is also enhanced too. In addition, the high rate dischargeability (HRD) is ameliorated remarkably, and the value of HRD value at 240 mA/g rises by 78.1%–87.8% for Ti55V10Ni35 + 6 wt.% LiH alloy electrodes. The improvement of characteristics of the electrochemical hydrogen storage characteristics may be attributed to LiH, which has excellent electrochemical activity. 相似文献
16.
Kirillov Sviatoslav A. Potapenko Anna V. Potapenko Alexander V. 《Journal of Solid State Electrochemistry》2020,24(5):1113-1121
Journal of Solid State Electrochemistry - Overreaching certain minimum allowable voltage upon discharging a lithium-ion battery (overdischarge) leads to the insertion of an overstoichiometric... 相似文献
17.
Effect of cerium on the corrosion-electrochemical and mechanical properties of aluminum alloys with an iron content of up to 3% was studied in order to use secondary aluminum in development of sacrificial formulations. 相似文献
18.
《Electrochemistry communications》2008,10(10):1486-1489
The Co–B alloy was prepared by the chemical reduction method and the annealing method. The structural and morphological characterizations were performed using TEM and XRD. The Electrochemical Measurements were performed using LAND battery test instrument. After annealing treatment,the initial Co–B alloy decomposes to crystalline Co and B with a kind of coating sphere structure. The excellent electrochemical hydrogen storage properties are also obtained. 相似文献
19.
Vitalie Stavila Jae-Hyuk Her Wei Zhou Son-Jong Hwang Leigh Anna M. Ottley 《Journal of solid state chemistry》2010,183(5):1133-1140
Calcium borohydride can reversibly store up to 9.6 wt% hydrogen; however, the material displays poor cyclability, generally associated with the formation of stable intermediate species. In an effort to understand the role of such intermediates on the hydrogen storage properties of Ca(BH4)2, calcium dodecahydro-closo-dodecaborate was isolated and characterized by diffraction and spectroscopic techniques. The crystal structure of CaB12H12 was determined from powder XRD data and confirmed by DFT and neutron vibrational spectroscopy studies. Attempts to dehydrogenate/hydrogenate mixtures of CaB12H12 and CaH2 were made under conditions known to favor partial reversibility in calcium borohydride. However, up to 670 K no notable formation of Ca(BH4)2 (during hydrogenation) or CaB6 (during dehydrogenation) occurred. It was demonstrated that the stability of CaB12H12 can be significantly altered using CaH2 as a destabilizing agent to favor the hydrogen release. 相似文献
20.
《Journal of the Less Common Metals》1984,96(1):149-157
Non-volatile getter alloys, which have been extensively used for a long time in the traditional field of vacuum technology, have recently been proposed for more advanced applications related to plasma physics, controlled nuclear fusion and general tritium-handling systems. Heat pumps and hydrogen storage devices, where pure hydrogen must be used, may also need purification systems based on these gettering alloys. Some zirconium-based alloys, which are commercially available with different compositions, are good candidates for getter materials in such applications. The equilibrium laws which govern the solution of the hydrogenic species in these alloys up to gas concentrations higher than those usually involved in vacuum applications have been investigated and are discussed together with the main physicochemical properties of the alloys. 相似文献