Effect of Al, B, Ti and Zr additive elements on the electrochemical hydrogen storage performance of MgNi alloy

Anık, Mustafa; Özdemir, Gazi; Küçükdeveci, Nilüfer; Baksan, Bedri

doi:10.1016/j.ijhydene.2010.10.087

Cited by 46 publications

(12 citation statements)

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“…12,26,27 The capacity retention rate degrades slightly as the Co content of the alloy increases probably due to higher pulverization of the alloy as the volume expansion increases. [5][6][7][8]26 This work clearly shows that hydrogen storage alloys, which are synthesized by the electro-deoxidation technique, have either equal or even superior (due to more porous structure) electrode performances as compared to the performances of the same alloys synthesized by the traditional techniques. Therefore electro-deoxidation may become very effective and probably more economical method 21 in the synthesis of the hydrogen storage materials.…”

Section: Resultsmentioning

confidence: 78%

“…[1][2][3] The big portion of the works is conducted on the development of the high performance electrode alloy with the proper synthesis methods for these secondary batteries. [4][5][6][7][8][9] Recently a novel technique called electro-deoxidation, which is also known as Fray-Farthing-Chen (FFC) Cambridge process, 10,11 is reported as very promising for the economical synthesis of the hydrogen storage alloys. [12][13][14] One of the well-known commercial alloy groups for the nickel metal hydride batteries is lanthanum-nickel based alloys and they are generally synthesized by the melting and casting under the protective atmosphere.…”

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confidence: 99%

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Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Anık

Aybar

Hatirnaz

et al. 2015

J. Electrochem. Soc.

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La 2 (Ni 1-x Co x ) 7 (x = 0.05, 0.1, 0.2) alloys were synthesized directly from sintered mixture of La 2 O 3 + NiO + CoO in the molten CaCl 2 electrolyte by the electro-deoxidation method at 850 • C and the electrochemical hydrogen storage characteristics of the synthesized alloys were observed. Sintering (at 1200 • C for 3 h) converted the hygroscopic La 2 O 3 (by the reaction with NiO) into the non-hygroscopic LaNiO 3 , La 3 Ni 2 O 6.5 and La 4 Ni 3 O 9 depending on the Co content of the oxide mixture. The X-ray diffraction peaks indicated that La 2 NiO 4 was the main La-Ni-O phase formed as a result of partial reduction or dissociation reaction to initiate the LaNi 5 phase formation. The target La 2 Ni 7 phase formed much later than LaNi 5 phase probably due to the sluggish reduction of LaOCl. It was observed that La 2 (Ni 1-x Co x ) 7 (x = 0.05, 0.1, 0.2) alloys had promising discharge capacities changed between 227 mA h g −1 (La 2 (Ni 0.95 Co 0.05 ) 7 ) and 332 mA h g −1 (La 2 (Ni 0.8 Co 0.2 ) 7 ) depending on the alloy Co content. This work clearly indicated that the electro-deoxidation was very effective method in the synthesis of the hydrogen storage materials.The extensive developments in the portable electronic devices and the requirement for the environmental friendly transportation industry withdraw the attention of many researchers on the nickel metal hydride batteries. 1-3 The big portion of the works is conducted on the development of the high performance electrode alloy with the proper synthesis methods for these secondary batteries. 4-9 Recently a novel technique called electro-deoxidation, which is also known as Fray-Farthing-Chen (FFC) Cambridge process, 10,11 is reported as very promising for the economical synthesis of the hydrogen storage alloys. [12][13][14] One of the well-known commercial alloy groups for the nickel metal hydride batteries is lanthanum-nickel based alloys and they are generally synthesized by the melting and casting under the protective atmosphere. [15][16][17][18][19] Of course the individual elements (La, Ni and other additive elements) must be already extracted and refined for the melting and casting processes. The cast products need annealing for several hours to get the structural homogeneity. 20 Obviously this production pathway for the La-Ni based hydrogen storage alloys is not very encouraging especially for the large scale applications like battery systems of the electrical vehicles. The electro-deoxidation method looks more cost-effective since it provides direct synthesis of the alloy with the final stoichiometry from the raw materials (oxides). 21 In this work, as the continuation of our previous work, 22 La 2 (Ni 1-x Co x ) 7 (x = 0.05, 0.1, 0.2) hydrogen storage alloy was synthesized by the molten salt electro-deoxidation method for the first time in the literature. In our previous work we presented the alloy development stages of La 2 Ni 7 during electro-deoxidation. 22 In this work part of Ni was replaced by Co systematically and then the alloy developmen...

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Section: Resultsmentioning

confidence: 78%

mentioning

confidence: 99%

Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Anık

Aybar

Hatirnaz

et al. 2015

J. Electrochem. Soc.

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“…Rongeat et al [9] reported a 70% decay in capacity after 20 charge/discharge cycles. A lot of effort has been put into increasing the corrosion resistance of MgNi-based alloys to KOH electrolytes, mostly through studying various types of substitutions in the MgNi formula, such as replacements of the A-(by rare earth, transition, or other metals [10]) and B-sites (by transition metals [11,12]), different fabrication procedures [13], and surface treatment [14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Salt Additives to the KOH Electrolyte Used in Ni/MH Batteries

Yan

Kim

2015

Batteries

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KOH-based electrolytes with different salt additives were investigated to reduce their corrosive nature toward Mg/Ni metal hydride alloys used as negative electrodes in nickel metal hydride (Ni/MH) batteries. Alkaline metal halide salts and oxyacid salts were studied as additives to the traditional KOH electrolyte with concentrations varying from 0.005 M to 1.77 M. Effects of the cations and anions of the additives on charge/discharge performance are discussed. The reduction potential of alkaline cations and radii of halogen anions were correlated with initial capacity and degradation of the metal hydride alloy. A synergistic effect between KOH and some oxyacid salt additives was observed and greatly influenced by the nature of the salt additives. It was suggested that both the formation of a solid film over the metal hydride surface and the promotion of proton transfer in the additives containing electrolytes led to a decreased degradation of the electrodes and an increased discharge capacity. 12 salt additives, NaC2H3O2, KC2H3O2, K2CO3, Rb2CO3, Cs2CO3, K3PO4, Na2WO4, Rb2SO4, Cs2SO4, NaF, KF, and KBr, were found to increase the corrosion resistance of the MgNi-based metal hydride alloy.

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“…To reduce the dehydrogenation enthalpy of Mg 2 NiH 4 , a substantial amount of compositional modifications have been carried out [9,[13][14][15][16][17][18][19][20][21]. Partial substitution of Mg with foreign elements is significantly effective for dehydrogenation of Mg 2 NiH 4 .…”

Section: Introductionmentioning

confidence: 99%

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

Wei

Pan

et al. 2015

Computational Materials Science

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Effect of Al, B, Ti and Zr additive elements on the electrochemical hydrogen storage performance of MgNi alloy

Cited by 46 publications

References 28 publications

Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Effects of Salt Additives to the KOH Electrolyte Used in Ni/MH Batteries

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

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Effect of Al, B, Ti and Zr additive elements on the electrochemical hydrogen storage performance of MgNi alloy

Cited by 46 publications

References 28 publications

Synthesis of La2(Ni1-xCox)7(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Synthesis of La2(Ni1-xCox)7(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Effects of Salt Additives to the KOH Electrolyte Used in Ni/MH Batteries

Effects of single- and co-substitution of Ti on dehydrogenation of Mg 2 NiH 4 : A first-principles study

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Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique

Synthesis of La₂(Ni_1-xCo_x)₇(x = 0.05, 0.1, 0.2) Hydrogen Storage Alloys by the Electro-Deoxidation Technique