Effects of coating layers on electrochemical properties of Nd Mg Ni-based alloys

Li, Yuan; Wang, Chunxiao; Dong, Zhentao; Wang, Jin; Yang, Shuqin; Ke, Dandan; Han, Shumin

doi:10.1016/j.ijhydene.2017.06.170

Cited by 23 publications

(5 citation statements)

References 40 publications

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“…However, for N > 30 cycles, the differences between values for based and HEA modified material gradually disappear. After N = 60 cycles both types of electrode materials reach values close to 120 mA∙g −1 (these values are relatively high, compared with other HSMs [ 30 , 32 , 34 , 39 , 42 ]). As seen, the advantageous effect of the increase due to HEA sputtering is observed for relatively short cycling only.…”

Section: Resultsmentioning

confidence: 80%

“…As it has been mentioned, the multicomponent metallic coating should facilitate the maintaining of high specific capacities of the hydrogen storage substrate and reveal electrocatalytic properties to hydrogen sorption, and it should protect the active material particles (containing highly active lanthanum) against corrosion attack of aqueous, alkaline electrolyte. Among the constituents of the arranged HEA composition, Ni, Co, and Fe are responsible for catalytic behaviour [ 18 , 25 , 26 , 27 , 28 , 30 ], whereas Cr and Ti, due to their tendency to effective passivation of HSM [ 6 , 31 ], for corrosion resistance, and thus prolonged cycle life. The characteristics of changes in hydrogenation properties of hydrogen storage material by the amorphous layer of high-entropy TiCrFeCoNi alloy were accompanied by the morphology of the tested LaNi 4.5 Co 0.5 powders before and after the HEA modification process (SEM), the chemical composition (EDS), and phases analysis (XRD) of amorphous structure of the HEA coating.…”

Section: Introductionmentioning

confidence: 99%

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Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

2022

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The effect of encapsulation of LaNi4.5Co0.5 powdered hydrogen storage material with ≈0.5 µm thick, magnetron-sputtered amorphous film of TiCrFeCoNi high-entropy alloy (HEA) on functional hydrogenation parameters of the hydride electrode is discussed. The multicycle galvanostatic charge/discharge tests carried out in deaerated, 6 M KOH solution allow for determining specific capacity decrease, exchange current density of the H2O/H2 system, and high rate discharge ability (HRD) of the hydride electrodes. Concentrations of individual constituents of the HEA in the particle coating determined by EDS analysis were practically the same (≈20 at.%) as in the applied TiCrFeCoNi target material. The XRD phase analysis pointed out the amorphous structure of the HEA coating. The presence of HEA coating decreases capacity by 10–15 per cent, but increases exchange current density for H2O/H2 system. The effect of HEA on capacity fade is ambiguous: low for 10–25 cycles (most probably due to effective corrosion inhibition) and distinct at long-term cycling (most probably due to galvanic effects resulting from mechanical degradation of particle surface). The presence of HEA coating considerably improves the HRD of the electrode material: for a discharge rate of 5C, the HRD coefficient becomes 4.6 times greater for HEA modified storage material.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

2022

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“…Li et al [131] conducted a study on a Mg-Nd-Ni alloy as a negative electrode material for Ni-MH batteries. They used chemical plating on the surface of a Nd 0.7 Mg 0.3 Ni 3 alloy, with Ni and Co plating treatments carried out separately (Figure 17).…”

Section: Surface Coatingmentioning

confidence: 99%

“…(d) Untreated alloy TEM; (e) Ni TEM; (f) Co-coated alloy TEM. Reprinted with permission from Ref [131]…”

mentioning

confidence: 99%

Surface Modifications of Magnesium-Based Materials for Hydrogen Storage and Nickel–Metal Hydride Batteries: A Review

2023

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Whether it is fossil energy or renewable energy, the storage, efficient use, and multi-application of energy largely depend on the research and preparation of high-performance materials. The research and development of energy storage materials with a high capacity, long cycle life, high safety, and high cleanability will improve the properties of energy storage systems and promote their wide application. In recent years, Mg-based materials, from a comprehensive consideration of energy storage performance, raw material reserves, and prices, have demonstrated potential industrial applications as large-scale hydrogen storage materials. Nevertheless, Mg-based materials also have obvious disadvantages: as a hydrogen storage material, the hydrogen absorption/desorption rate is insufficient, as well as the high hydrogen absorption/desorption temperatures; as the electrode material of Ni-MH batteries, the reactions of Mg with alkaline electrolyte and corrosion are the main problems for applications. This article reviews different surface treatment methods and mechanisms for surface modifications of Mg-based materials for hydrogen storage and Ni-MH battery applications, as well as the performance of the materials after surface modifications. Multiple experimental studies have shown that the surface layer or state of Mg-based materials has a strong impact on their performance. Surface modification treatment can greatly improve the energy storage performance of magnesium-based materials for hydrogen storage and Ni-MH battery applications. Specifically, Mg-based materials can have a lower hydrogen absorption/desorption temperature and a faster hydrogen absorption/desorption rate when used as hydrogen storage materials and can improve the corrosion resistance, initial discharge capacity, and cycling stability in alkaline solutions when used as negative electrode materials for Ni-MH batteries. By offering an overview of the surface modification methods for Mg-based materials in two energy storage fields, this article can improve researchers’ understanding of the surface modification mechanism of Mg-based materials and contribute to improving material properties in a more targeted manner. While improving the material properties, the material’s preparation and surface modification treatment process are considered comprehensively to promote the development, production, and application of high-performance Mg-based materials.

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“…Tang et al [35] found that Ni coating successfully increased the discharge capacity of Mg 2 Ni alloys by lowering the charge transfer resistance on the alloy surface. Li et al [36] reported that the nickel coating tended to create a denser and more stable surface layer than that from cobalt coating. As a result, the coated nickel layer on Nd 0.7 Mg 0.3 Ni 3 hydrogen storage alloys significantly improved the electrochemical characteristics of the alloy electrode.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of perovskite‐type oxide LaFeO3 with electroless nickel deposition for application in MH‐Ni batteries

Xu,

Zhang,

Zhao

et al. 2023

Nano Select

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In this study, the perovskite‐type oxide LaFeO3 is treated by electroless Ni deposition with different reaction time and the electrochemical properties of the resulting material are investigated as the anode for MH‐Ni batteries. XRD, SEM, and TEM measurements reveal a uniform deposition of crystalline nickel on the oxide surface and a clear increase in the amount of Ni coating with the deposition time. The electrochemical analysis shows that the electroless deposition can significantly improve the maximum discharge capacity of the battery. Furthermore, the coated electrodes exhibit excellent activation performance and superior cyclic stability. With the increase in the reaction temperature, improvements in the discharge ability, exchange current density, and diffusing coefficient of hydrogen are also observed.

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Effects of coating layers on electrochemical properties of Nd Mg Ni-based alloys

Cited by 23 publications

References 40 publications

Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

Modification of Hydrogenation and Corrosion Properties of Hydrogen Storage Material by Amorphous TiCrFeCoNi HEA Layer

Surface Modifications of Magnesium-Based Materials for Hydrogen Storage and Nickel–Metal Hydride Batteries: A Review

Surface modification of perovskite‐type oxide LaFeO3 with electroless nickel deposition for application in MH‐Ni batteries

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