Studies on electrochemical deposition and physicochemical properties of nanocrystalline Ni‐Mo alloys

Bigos, A.; Bełtowska-Lehman, E.; Kot, M.

doi:10.1016/j.surfcoat.2017.03.036

Cited by 42 publications

(25 citation statements)

References 35 publications

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“…It can also be combined with light‐absorbing materials as a co‐catalyst . A lot of work is focused on studying the synthesis of Ni−Mo by changing the morphology and composition . A Ni content of 60–80 % in these alloys has been found to be optimal for the activity and stability .…”

Section: Introductionsupporting

confidence: 73%

“…The absolute overpotential changes from 0.18 to 0.13 V, it then stays stable for several days before increasing again.T he low overpotential shows it is indeed active as suggested by theory andp revious studies. [2,[7][8][9][10][11][12][13][14]…”

Section: Experimental Activitymentioning

confidence: 99%

“…Amongst these materials, one of the most promising ones is alloyed Ni−Mo, which is surmised to have a hydrogen bonding energy (HBE) similar to that of Pt, owing to the synergy between Ni and Mo in alkaline water splitting . Alkaline water splitting is considered because of its relevance in industry and the availability of better‐performing anodes in alkaline relative to acidic media …”

Section: Introductionmentioning

confidence: 99%

“…of NiÀMo by changing the morphologya nd composition. [11][12][13]19] AN ic ontent of 60-80 %i nt hese alloys has been found to be optimal for the activity and stability. [2,13,16,20] However,a lthough some previousw orks have shown that NiÀMo is unstable in alkaline media, the origins of this instability have not been extensively studied to date, aside from one key work by Schalenbach et al, [20] who reported that NiÀMo can form multiple crystal phases depending on the ratio between Ni and Mo.…”

Section: Introductionmentioning

confidence: 99%

“…[6] Alkaline water splitting is considered because of its relevance in industry and the availability of better-performing anodes in alkaline relative to acidic media. [2,[7][8][9][10][11][12][13][14] Several strategies are employed to increaset he activity of NiÀMo, such as nanostructuring or using nanoparticles. [15][16][17] It can also be combined with light-absorbing materials as ac ocatalyst.…”

Section: Introductionmentioning

confidence: 99%

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Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

et al. 2019

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Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni−Mo cathodes for this reaction. Density functional theory studies show various Ni−Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long‐term stability of Ni−Mo cathodes are determined. Ni−Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni−Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO42−, ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH− concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni−Mo material more viable for renewable energy storage in chemical bonds.

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Section: Introductionsupporting

confidence: 73%

Section: Experimental Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

et al. 2019

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Influence of bath composition on the electrodeposition of amorphous Ni‐Mo alloys using potassium‐sodium tartrate as complexing agent

et al. 2021

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Currently, sodium citrate is the most used complexing agent for electrodeposition of Ni-Mo coatings, especially for studying the effect of bath temperature and current density on the proprieties of Ni-Mo coatings. This study evaluates the influence of the concentrations of nickel sulphate and sodium molybdate on the electrodeposition of Ni-Mo alloys in baths using tartrate as a complexing agent. Electrodepositions were carried out in a two-electrode cell. A 3 2 complete factorial design of experiments along with response surface methodology (RSM) was used for the optimization of bath variables for electrodeposition of Ni-Mo alloys. The coatings obtained were characterized in terms of chemical composition and surface morphology. The chemical composition of the coatings was most influenced by the sodium molybdate concentration. Ni-Mo coatings of good quality were obtained in potassium-sodium tartrate baths with Mo content in the range 18-44 wt%; some results present even higher Mo content than coatings obtained from citrate baths. The coating with the highest Mo content was deposited from the bath with a concentration ratio of nickel sulphate to sodium molybdate of 1:1. Surface morphology varied according to chemical composition, and microcracks were observed for the coating with 41 wt% Mo, for which scanning electron microscopy (SEM) images also show the presence of nodules. The most homogeneous coating surface was obtained at a concentration ratio of nickel sulphate to sodium molybdate of 10:3. X-ray diffraction analyses have shown that all coatings obtained in this work are amorphous.

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Interface Reaction between Tin Solder and Nanocrystalline Ni and Ni-Mo Coatings Obtained by Electrodeposition

Bigos

Valenza

Czaja

et al. 2022

J. of Materi Eng and Perform

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Studies on electrochemical deposition and physicochemical properties of nanocrystalline Ni‐Mo alloys

Cited by 42 publications

References 35 publications

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Influence of bath composition on the electrodeposition of amorphous Ni‐Mo alloys using potassium‐sodium tartrate as complexing agent

Interface Reaction between Tin Solder and Nanocrystalline Ni and Ni-Mo Coatings Obtained by Electrodeposition

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