The correlation of C14/C15 phase abundance and electrochemical properties in the AB2 alloys

Young, K.; Ouchi, T.; Huang, B.; Chao, B. S.; Fetcenko, M.A.; Bendersky, Leonid A.; Wang, Ke; Chiu, Chun

doi:10.1016/j.jallcom.2010.07.091

Cited by 76 publications

(57 citation statements)

References 88 publications

(104 reference statements)

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“…Its microstructure was studied extensively with a combination of SEM and transmission electron microscope previously . In order to preserve the secondary phases, which serve as an electrochemical catalyst, these AB 2 alloys were not annealed (Young, et al, 2010b). Fig.…”

Section: Stoichiometry In Laves Phase-based Ab 2 Metal Hydride Alloysmentioning

confidence: 99%

“…In alloy AB1.8, the phase abundance of C14, which has less storage capacity compared to C15 (Young, et al 2010b), is the highest and thus decreases the maximum storage capacity. The relationship between B/A stoichiometric ratio and reversible gas phase storage is similar to what is observed in maximum storage capacity: as the B/A stoichiometric ratio first increases, the reversible storage increases due to the higher plateau pressure and the higher C15 phase abundance with higher gaseous reversibility (Young, et al 2010b). With further increase in B/A stoichiometric ratio, the reversible storage capacity decreases for the same reason as the maximum storage capacity.…”

Section: Influences On Gaseous Hydrogen Storagementioning

confidence: 99%

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Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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Section: Stoichiometry In Laves Phase-based Ab 2 Metal Hydride Alloysmentioning

confidence: 99%

Section: Influences On Gaseous Hydrogen Storagementioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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“…Therefore, it is interesting to compare the internal resistance of The HRD capability of MH alloy was associated with the metallic nickel clusters embedded in its surface oxide after activation [45,46]. The saturated magnetic susceptibility (M S ) obtained from the magnetic susceptibility measurement shows clear correlation to the HRD of a series of A 2 B 7 MH alloys [13]. However, we also reported that some MH alloys with HRD were more related to the structure of the metal/oxide interface [47,48].…”

Section: Electrochemical Resultsmentioning

confidence: 99%

“…These IMCs are composed of mostly transition metals (TM), and some may contain rare-earth (RE) elements. The electrochemical high-rate performances of some of these MH alloys were compared in 2010 and the RE-based AB 5 MH alloy had the best high-rate dischargeability (HRD) performance [13]. The magnetic susceptibilities of these alloys, and a couple new ones, were compared in a 2013 article [14].…”

Section: Introductionmentioning

confidence: 99%

“…Among these processes, the alkaline bath is very effective in dissolving the native oxide, so as to form a porous oxide surface with catalytic Ni clusters imbedded [13,[16][17][18][19][20][21][22] and to increase the surface reactive area [23]. In the past, we have used this technique to prepare the alloy for the study of activated surfaces without going through electrochemical formation cycling [24].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Meng¹,

Kim

Hu³

et al. 2017

Batteries

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Abstract:The responses of one AB 5 , two AB 2 , four A 2 B 7 , and one C14-related body-centered-cubic (BCC) metal hydrides to an alkaline-etch (45% KOH at 110 • C for 2 h) were studied by internal resistance, X-ray diffraction, scanning electron microscope, inductively coupled plasma, and AC impedance measurements. Results show that while the etched rare earth-based AB 5 and A 2 B 7 alloys surfaces are covered with hydroxide/oxide (weight gain), the transition metal-based AB 2 and BCC-C14 alloys surfaces are corroded and leach into electrolyte (weight loss). The C14-predominated AB 2 , La-only A 2 B 7 , and Sm-based A 2 B 7 showed the most reduction in the internal resistance with the alkaline-etch process. Etched A 2 B 7 alloys with high La-contents exhibited the lowest internal resistance and are suggested for use in the high-power application of nickel/metal hydride batteries.

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Ni/Cd and Ni‐MH – The Transition to “Charge Carrier”‐Based Batteries

Wang

Zhu

2020

Encyclopedia of Electrochemistry

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Ni‐MH battery is developed and commercialized with lithium‐ion battery almost at the same time, to replace the environmentally unfriendly Ni/Cd battery and meet the increasing energy density requirements of consumer electronic devices. The success of Ni‐MH battery in consumer and industrial markets is mainly attributed to its specific negative electrode materials, namely a large variety of intermetallic compounds with reversible hydrogen absorption and desorption during charging and discharging. A unique hydrogen shuttle mechanism through the aqueous alkaline electrolyte between the layered Ni(OH) 2 cathode and interstitial metal hydride anode could be thus achieved. Hydrogen as the charge carrier in Ni‐MH battery is like the lithium ion in the lithium‐ion battery. The simple and robust structure of Ni‐MH battery brings high safety under various conditions, making Ni‐MH battery very competitive in applications demanding safety priority, such as hybrid electric vehicles. The brief history, basic structure, research, and development of electrode materials of Ni‐MH battery are introduced, with the emphasis on the hydrogen storage electrode alloys. Future development of Ni‐MH battery is expected to be focused on the automotive and stationary energy storage applications by greater innovation in the hydrogen storage alloy anodes with ultra‐high capacity and overall electrochemical properties.

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The correlation of C14/C15 phase abundance and electrochemical properties in the AB2 alloys

Cited by 76 publications

References 88 publications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Ni/Cd and Ni‐MH – The Transition to “Charge Carrier”‐Based Batteries

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