Cycle life and hydrogen storage properties of mechanical alloyed Ca1−xZrxNi5−yCry; (x = 0, 0.05 and y = 0, 0.1)

Chumphongphan, Somwan; Paskevicius, Mark; Sheppard, Drew A.; Buckley, Craig E.

doi:10.1016/j.ijhydene.2012.01.131

Cited by 19 publications

(8 citation statements)

References 29 publications

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“…Certain alloys are commercially available such as heavily substituted Ti-Mn (Ti0.97Zr0.019V0.439Fe0.097Cr0.045Al0.026Mn1.5) [76], which have favourable properties. Other intermetallics excluded include those based on CaNi3, which show degradation in performance for only a minimal decrease in cost compared to CaNi5 [77,78], and solid solutions of Ti-Cr-V-Fe, which remain expensive even when produced with cheaper forms of vanadium such as ferrovanadium [12,79,80].…”

Section: Candidate Hydrides For Low-temperature Hydrogen Storagementioning

confidence: 99%

Metal hydrides for concentrating solar thermal power energy storage

et al. 2016

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The development of alternative methods for thermal energy storage is important for improving the efficiency and decreasing the cost for Concentrating Solarthermal Power (CSP). We focus on the underlying technology that allows metal hydrides to function as Thermal Energy Storage (TES) systems and highlight the current state-of-the-art materials that can operate at temperatures as low as room-temperature and as high as 1100 o C. The potential of metal hydrides for thermal storage is explored while current knowledge gaps about hydride properties, such as hydride thermodynamics, intrinsic kinetics and cyclic stability, are identified. The engineering challenges associated with utilising metal hydrides for high-temperature thermal energy storage are also addressed.

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Section: Candidate Hydrides For Low-temperature Hydrogen Storagementioning

confidence: 99%

Metal hydrides for concentrating solar thermal power energy storage

et al. 2016

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“…The CaNi 5 ‐based alloy has been studied extensively due to its low cost and the proper storage capacity, 29,30 where the elements Ca and Ni can be replaced by other metals 31–33 . Li et al 34 have examined the effect of the substitution of Ca by La, Ce, and Mg as well as the substitution of Ni by Co and Al, the results showed that this substitution clearly improved the maximum discharge capacity and kept the same number of activation cycles (first cycle).…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological, and electrochemical properties of AB₅ hydrogen storage alloy by mechanical alloying

Dabaki

Khaldi

Elkedim

et al. 2021

Env Prog and Sustain Energy

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Mechanical alloying (MA) is one of the most promising methods in the development of intermetallic alloys and their scientific research. In this paper, elemental powder mixtures of Ca, Ni, and Mn of nominal composition CaNi5‐xMnx (with x = 0.3, 0.5, and 1) were elaborated by MA technique during different milling times (2–60 h). Structural, morphological, and electrochemical changes were investigated by X‐ray diffraction (XRD), scanning electron microscopy, and Ec‐Lab galvanostat, respectively. The XRD test indicated that each alloy has Ni and CaNi3 or CaNi5 phases. In addition, the particle size of the ground powders is decreased with increasing milling time. Furthermore, all alloys have a very high activation capacity, whereby the activation capacity can be fully realized during the first cycle. The results showed that the most significant value of discharge capacity for all alloys was 40 h.

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“…On the other hand, these lanthanumbased compounds have some limitations, including their higher cost than MmNi 5 or CaNi 5 compounds [21,22]. The CaNi 5 compound has attracted much attention due to its low cost and acceptable storage capacity [23,24]. The excellent cycling stability of CaNi 5 can be enhanced by partially replacing the Ni with Mg, Co, Fe, and Mn [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

Dabaki

Khaldi

Elkedim

et al. 2021

J Solid State Electrochem

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In this paper, we study systematically the effect of ball/powder weight ratio on the morphological, structural, and electrochemical properties of CaNi 4.7 Mn 0.3 powder alloy by mechanical milling. The CaNi 4.7 Mn 0.3 alloy powder is elaborated for an optimal milling time of 40 h with 8:1 and 12:1 ball/powder weight ratios. The X-ray diffraction (XRD) characterization shows that the CaNi 4.7 Mn 0.3 alloy powder is characterized by a nanocrystalline/amorphous crystallographic state and exhibits two major Ni and CaNi 3 phases irrespective of the ball/powder weight ratio. The CaNi 4.7 Mn 0.3 electrode activates rapidly in the first cycle regardless of the ball/powder weight ratio, and the best value of maximum discharge capacity is obtained for an 8:1 ratio (125 mAh g −1 ). The values of diffusion coefficient/mean grain size squared ratio D H a 2 , Nernst's potential E 0 , and exchange current density I 0 at the first activation cycle are the best for 8:1 ball/powder weight ratio. After activation, the discharge capacity decreases exponentially regardless of the ball/powder weight ratio. Indeed, the capacity loss and the degradation rate after 50th cycle are about 71%, 10.71 cycle −1 and 53%, 2.95 cycle −1 for 8:1 and 12:1, respectively. The evolution of the D H a 2 ratio, E 0 , and I 0 during the cycling is in good agreement with that of the discharge capacity. The highest values of the diffusion coefficient D H , Nernst's potential E 0 , and exchange current density I 0 after 50th cycle are observed for 8:1 ball/powder weight ratio. KeywordsCaNi 4.7 Mn 0.3 hydrogen storage alloy • Mechanical alloying • Morphological and structural properties • Electrochemical properties

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Cycle life and hydrogen storage properties of mechanical alloyed Ca1−xZrxNi5−yCry; (x = 0, 0.05 and y = 0, 0.1)

Cited by 19 publications

References 29 publications

Metal hydrides for concentrating solar thermal power energy storage

Metal hydrides for concentrating solar thermal power energy storage

Structural, morphological, and electrochemical properties of AB₅ hydrogen storage alloy by mechanical alloying

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

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Cycle life and hydrogen storage properties of mechanical alloyed Ca1−xZrxNi5−yCry; (x = 0, 0.05 and y = 0, 0.1)

Cited by 19 publications

References 29 publications

Metal hydrides for concentrating solar thermal power energy storage

Metal hydrides for concentrating solar thermal power energy storage

Structural, morphological, and electrochemical properties of AB5 hydrogen storage alloy by mechanical alloying

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

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Structural, morphological, and electrochemical properties of AB₅ hydrogen storage alloy by mechanical alloying