New nanoparticles of (Sm,Zn)-codoped spinel ferrite as negative electrode in Ni/MH batteries with long-term and enhanced electrochemical performance

Zayani, Wissem; Azizi, Samir; El‐Nasser, Karam S.; Belgacem, Yassine Ben; Othman, I.; Fenineche, N.; Mathlouthi, H.

doi:10.1016/j.ijhydene.2018.10.220

Cited by 18 publications

(10 citation statements)

References 45 publications

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“…Thus, its making a positive contribution to reducing the amount of energy necessary for activation 55 Ni powder probably creates a mechanical coating layer on the electrodes surface, further increasing the practical discharge capacity on activation 56,57 …”

Section: Resultsmentioning

confidence: 99%

“…55 • Ni powder probably creates a mechanical coating layer on the electrodes surface, further increasing the practical discharge capacity on activation. 56,57 Figure 6 shows the evolution of the charging/ discharging potential depending on time and the enlargement of the discharge curves converted into potential as a function of the practical discharge capacity during the first cycle of activation, in 6 M KOH electrolyte concentration under the C/10 rate (51 mA g −1 ).…”

Section: Activation Properties Of the Electrodesmentioning

confidence: 99%

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Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

et al. 2020

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In this article, we exhaustively examined the effects of Mn substitution for Ni on the structures and electrochemical characterization of the CaNi 5−x Mn x (x = 0.2, 0.3, 0.5, 1) alloys prepared by mechanical synthesis for 40 hours at ball to powder weight ratio of 8:1. The characterization of electrodes was examined by X-ray diffraction, scanning electron microscope and electrochemical tests. In this context, the structural properties for each alloy have two major phases Ni, Ca 2 Ni 7 ; Ni, CaNi 3 ; Ni, CaNi 5 ; Ni, CaNi 3 where x = 0.2, 0.3, 0.5 and 1 respectively. The powder micrograph shows the existence of agglomerates has average particle size between 22 and 35 μm. In addition, the quantification by energy dispersive spectroscopy has been indicated the chemical composition of the all produced alloys is near their nominal composition. All electrodes are activated during the first cycle, independent of the Mn substitution rate. The highest values of discharge capacity and reversibility are obtained for x = 0.3 (125 mAh g −1 , 0.17 V) and x = 0.5 (119 mAh g −1 , 0.19 V) despite their low cycle stability. The evolution of D H /a 2 ratio and the I 0 exchange current density for the different Mn substitution rates is in accordance with that of the evolution of discharge capacities. The better kinetic properties is observed for x = 0.5 during electrochemical cycling.

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Section: Resultsmentioning

confidence: 99%

Section: Activation Properties Of the Electrodesmentioning

confidence: 99%

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

et al. 2020

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“…The analytical substances (FeCl 3 , 6H 2 O), (SmCl 3 , 6H 2 O), ZnCl 2 and citric acid were employed as raw materials. A detailed description of the synthesis method was described in our previous paper 29 . Adequate amounts of these precursors and an addition of 10% citric acid were dissolved in deionized water to obtain a homogeneous solution.…”

Section: Methodsmentioning

confidence: 99%

“…A detailed description of the synthesis method was described in our previous paper. 29 Adequate amounts of these precursors and an addition of 10% citric acid were dissolved in deionized water to obtain a homogeneous solution. After that, (≈0.1%) of Carboxymethyl Cellulose (viscosity modifier) was added under stirring.…”

Section: Sample Synthesis and Preparation Of The Negative Electrodesmentioning

confidence: 99%

Structure and electrochemical hydrogen storage properties of spinel ferritesSm_xZn₁₋_xFe₂O₄alloys (x = 0,x = 0.2,x = 0.4, andx = 0.6) forNi‐MHaccumulator applications

Zayani

Azizi

Salah

et al. 2022

Env Prog and Sustain Energy

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“…Specifying redox parameters, such as the exchange current density, I 0 , and the Nernst's potential, E 0 , of the negative hydride electrode CaNi 4.3 Mn 0.3 , is done by defining the voltammogram, showing the current density evolution as a function of the potential, using the potentiodynamic method for a potential scanning rate of 1 mV s −1 at room temperature [63,64]. The application of Stern's first law on the voltammograms obtained allows us to plot potentiodynamic or Tafel's polarization curves, ln(I) = f (E app ) [34].…”

Section: The Redox Properties Of the Cani 47 Mn 03 Electrode By Potentiodynamic Methodsmentioning

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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New nanoparticles of (Sm,Zn)-codoped spinel ferrite as negative electrode in Ni/MH batteries with long-term and enhanced electrochemical performance

Cited by 18 publications

References 45 publications

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

Structure and electrochemical hydrogen storage properties of spinel ferritesSm_xZn₁₋_xFe₂O₄alloys (x = 0,x = 0.2,x = 0.4, andx = 0.6) forNi‐MHaccumulator applications

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

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New nanoparticles of (Sm,Zn)-codoped spinel ferrite as negative electrode in Ni/MH batteries with long-term and enhanced electrochemical performance

Cited by 18 publications

References 45 publications

Electrochemical properties of the CaNi 5− x Mn x electrodes synthesized by mechanical alloying

Electrochemical properties of the CaNi 5− x Mn x electrodes synthesized by mechanical alloying

Structure and electrochemical hydrogen storage properties of spinel ferritesSmxZn1−xFe2O4alloys (x = 0,x = 0.2,x = 0.4, andx = 0.6) forNi‐MHaccumulator applications

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

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Product

Resources

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Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

Structure and electrochemical hydrogen storage properties of spinel ferritesSm_xZn₁₋_xFe₂O₄alloys (x = 0,x = 0.2,x = 0.4, andx = 0.6) forNi‐MHaccumulator applications