Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling

Bala, H.; Dymek, Martyna

doi:10.1016/j.matchemphys.2015.10.042

Cited by 19 publications

(24 citation statements)

References 27 publications

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“…NiO lub Ni(OH) 2 , będące w kontakcie elektrycznym z materiałem elektrody, z łatwością redukują się w kolejnym cyklu, podczas ładowania elektrody. Bardziej aktywny elektrochemicznie lantan utlenia się powoli, ale nieodwracalnie (do La(OH) 3 ), zarówno podczas procesu anodowego, jak i katodowego [3,6,7], co oznacza, że udział utlenionego lantanu w materiale wodorkowym stale narasta, stając się istotny zwłaszcza po długotrwałym cyklowaniu. Innymi słowy, głównym produktem korozji materiału wodorochłonnego po dużej liczbie cykli będzie La(OH) 3 .…”

Section: Wprowadzenieunclassified

“…Wobec stwierdzonego przez nas niedawno wykładniczego charakteru spadku pojemności prądowej spowodowanej cyklowaniem [7], dla dalszych rozważań nad trwałością użytkową materiałów wodorkowych, w tym wiarygodnej oceny ich odporności na korozję w środowisku silnie alkalicznym, niezbędne jest zwiększenie liczby cykli ładowania/ rozładowania do co najmniej N = 50. Doświadczenie pokazuje, iż dla znacznie większych ilości cykli (np.…”

Section: Wprowadzenieunclassified

“…Doświadczenie pokazuje, iż dla znacznie większych ilości cykli (np. N = 80 -100) pastylki elektrod wykonywane wg przyjętej przez nas metodyki [7,11] zaczynają ulegać mechanicznej degradacji.…”

Section: Wprowadzenieunclassified

“…Ponadto, zależność pojemność -numer cyklu pozwoli ocenić szybkość korozji materiału elektrody i tzw. cykl połówkowy spadku pojemności [7]. Każdy ze wspomnianych parametrów może być przedstawiony w funkcji numeru cyklu.…”

Section: Metodyka Eksperymentalnaunclassified

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Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Dymek

2015

Mechanik

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Section: Wprowadzenieunclassified

Section: Metodyka Eksperymentalnaunclassified

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Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Dymek

2015

Mechanik

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“…Among studies under improvement of corrosion stability of powdered hydride electrodes, there appear papers dealing with protection of active particles by metallic coatings [9,10,[17][18][19][20][21][22]. As the efficient coatings, the surface layers of such metals as Cu, Ni, Co, and Pd have been successfully applied.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of LaNi5 electrode decay in alkaline medium by electroless encapsulation of active powder particles

Dymek

Bala

2016

J Solid State Electrochem

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Surface of powdered LaNi 5 intermetallic compound has been modified by active particle coverage with electroless nickel (Ni-P). The electrode degradation process in 6 M KOH solution has been tested across 70 charge/ discharge cycles at −0.5 C/+0.5 C rates. It has been established that after approx. 25-35 initial cycles, the electrode degradation process fulfills first order chemical reaction kinetics law: logarithm of discharge capacity linearly decreases with cycle number. The rate constant for the Ni-P protected material is over 20 % lower than that of as received one. The surface modification also improves the alloy hydrogenation kinetics: exchange current densities of H 2 O/H 2 system are generally greater for modified material and, contrary to uncovered material, do not practically decrease with long-lasting cycling.

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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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Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling

Cited by 19 publications

References 27 publications

Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Inhibition of LaNi5 electrode decay in alkaline medium by electroless encapsulation of active powder particles

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

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Corrosion degradation of powder composite hydride electrodes in conditions of long-lasting cycling

Cited by 19 publications

References 27 publications

Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Measuring algorithm for electrochemical parameters evaluation of hydride electrode in conditions of its long-lasting cycling

Inhibition of LaNi5 electrode decay in alkaline medium by electroless encapsulation of active powder particles

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

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Product

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