Electrochemical Deposition and Characterization of Ni and NiCu Coatings for Hydrogen Evolution Reaction

Öztop, Ömercan; Ağaoğlu, Gökçe Hapçı; Orhan, Gökhan

doi:10.3103/s1068375519040094

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…The Bode diagrams show only one time constant for each sample, confirming that the Randles circuit is appropriate for analyzing the EIS data (Figure S10b). 54,55 Both Co-and Ni-1.5 h-MoP NPs showed smaller R ct values of 19.1 and 14.1 Ω, respectively, compared to that of MoP (20.5 Ω). The smaller semicircle and R ct of the M-incorporated samples reveal that the post-synthetic transformation improved the catalytic HER activity of the MoP NPs, which was confirmed by the HER polarization curves and Tafel slopes.…”

Section: Resultsmentioning

confidence: 99%

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Kim

Park

Lee

et al. 2022

Intl J of Energy Research

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Summary Post‐synthetic chemical transformation is a recently emerging nanomaterial manufacturing method for obtaining materials with precisely modulated properties. Through post‐synthetic transformation methods, foreign elements are exchanged or incorporated into presynthesized nanoparticles (NPs). However, metal phosphides have not been primarily used as starting materials because of their strong bonding characteristics. In this study, we synthesized bimetallic transition metal phosphide (TMP) NPs through a cation addition reaction using amorphous molybdenum phosphide (MoP) as the starting material, which is a promising catalyst for the hydrogen evolution reaction (HER). The additional metal elements, namely Co and Ni, were successfully incorporated into the parent MoP NPs, which led to only marginal changes in size or shape, even after 12 hours of reaction. Because morphological factors strongly influence catalytic activity, nanocatalysts with identical morphologies provide a direct comparison among NPs with various chemical properties. The Co‐ and Ni‐incorporated MoP NPs exhibited significantly enhanced catalytic activities for the HER, with similar electrochemically active surface areas. In particular, Co‐1.5 h‐MoP showed the highest HER activity (167 mV at −10 mA cm−2) and durability among the samples in 0.5 M H2SO4. Such an improvement in catalytic activity through the cation addition reaction may be ascribed to the difference in the electronegativities of the original and newly added metal cations, as confirmed by X‐ray photoelectron spectroscopy (XPS), resulting in abundant metal‐P bonding and oxidation resistivity. This study provides a new advanced platform for directly analyzing the inherent characteristics of nanomaterials for diverse applications, especially electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Kim

Park

Lee

et al. 2022

Intl J of Energy Research

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“…Alloy coatings could be applied to improve the hardness, oxidation, and wear resistance of the device's surface [1][2][3][4][5]. Some important alloy coatings that attracting many interests are NiCu film [6], NiCr film [7], FeNiCr film [8], FeCoNiCrMn film [9], and NiCo film [10,11]. Among them, NiCo alloy coating plays an important role in the electronic field because of its high corrosion resistance, high hardness, and unique magnetic properties [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical characteristics of Ni₅₀Co₅₀/Ni substrate during indentation by molecular dynamics

Pham¹,

Fang²,

Nguyen³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Coating an alloys film onto a metallic surface could dramatically improve the surface quality. This report studies the microstructure and intermixing phenomena of Ni50Co50 film deposited on Ni(001) substrate with flat, asperity and trench Ni surfaces by molecular dynamics (MD) simulation. The effects of the film thickness and loading velocity on the mechanical properties and deformation behaviours of the sample are also surveyed by indentation. The results represent that the intermixing and lattice structure of the film is enhanced after annealing. Moreover, the sample hardness is improved as the deposited Ni50Co50 film when the film thickness rising from 18 to 38 Å. In contrast, the structure transformation rate and dislocations density of the sample decrease when the Ni50Co50 film becomes thicker. Interestingly, the plastic deformation rate and dislocation density of the sample at the trench surface are higher than the flat one. Besides, the increase of the loading velocity gives rise to the plastic deformation and the local stress rates. The dislocation density of the Ni50Co50/Ni sample is reduced if the loading speed is high enough.

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Electrodeposited Ni-Cu Coatings with Hierarchical Surface Morphology

Staroń

Ledwig

Dubiel

2022

Metall Mater Trans A

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In recent years, Ni-Cu alloy coatings obtained by electrolytic deposition have received increasing interest, because of their good anti-corrosive, mechanical, magnetic, electrical, and decorative properties. Further applications of these coatings for electrode materials and catalysts may be possible by developing hierarchical surface morphology, and thus a combination of high surface roughness, high microhardness, and good corrosion resistance. In the present work, four types of Ni-Cu alloy coatings were deposited in a single-step process from electrolytic baths with Cu2+:Ni2+ concentrations equal to 1:30, 1:20, 1:15, and 1:10 using deposition current densities of 2 A/dm2 and 4 A/dm2. The surface morphology of the coatings was characterized using a scanning electron microscope and an optical profilometer. The coatings exhibited a nodular morphology, which with the change of the Cu2+:Ni2 ratio and the current parameters changed from smooth and compact to rougher with regularly spaced nodular microprotrusions. Thus, a hierarchical surface morphology was obtained. Transmission electron microscopy investigations revealed that the fine-grained microstructure of the coatings consisted of the γ solid solution, as well as the metastable intermetallic L10 NiCu phase. The differences in the Cu concentration at the cross-sections demonstrated by quantitative microanalysis of the chemical composition indicated a dendritic growth of the coatings and a preferential reduction of copper ions over nickel ions. The coatings were also characterized by a microhardness greater than 3.71 GPa and good electrochemical corrosion resistance in chloride media. Coatings with hierarchical morphology and high surface roughness showed a higher corrosion current. The study provides a new method for electrodeposition hierarchical Ni-Cu coatings under specific chemical compositions of the electrolytic bath and current conditions, characterized by a combination of promising properties for electrode and catalytic applications. Graphical Abstract

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Electrochemical Deposition and Characterization of Ni and NiCu Coatings for Hydrogen Evolution Reaction

Cited by 6 publications

References 39 publications

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Mechanical characteristics of Ni₅₀Co₅₀/Ni substrate during indentation by molecular dynamics

Electrodeposited Ni-Cu Coatings with Hierarchical Surface Morphology

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Electrochemical Deposition and Characterization of Ni and NiCu Coatings for Hydrogen Evolution Reaction

Cited by 6 publications

References 39 publications

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Transition‐metal‐incorporated molybdenum phosphide nanocatalysts synthesized through post‐synthetic transformation for the hydrogen evolution reaction

Mechanical characteristics of Ni50Co50/Ni substrate during indentation by molecular dynamics

Electrodeposited Ni-Cu Coatings with Hierarchical Surface Morphology

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Mechanical characteristics of Ni₅₀Co₅₀/Ni substrate during indentation by molecular dynamics