Electrochemical Deposition of Ni–W Crack-Free Coatings

Suvorov, Dmitriy V.; Gololobov, G. P.; Tarabrin, Dmitriy Yu.; Slivkin, Evgeniy V.; Karabanov, Sergey M.; Tolstogouzov, A.

doi:10.3390/coatings8070233

Cited by 18 publications

(11 citation statements)

References 28 publications

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“…The W content resulting from the intermediate reduction increases and decreases because of its more positive potential and low diffusion rate, respectively. In the high Ni bath, this change trend was also observed by Suvorov et al [20]. They considered that the electrochemical reduction of Ni ions was carried out through three subsequent reactions, while the deposition of W could be induced by means of the Ni adsorptive species [20,23].…”

Section: Electrodeposition Of Ni-w Alloyssupporting

confidence: 68%

“…In the high Ni bath, this change trend was also observed by Suvorov et al [20]. They considered that the electrochemical reduction of Ni ions was carried out through three subsequent reactions, while the deposition of W could be induced by means of the Ni adsorptive species [20,23]. That is, the NiOH ads was further reduced by two routes of ( 3) and ( 6), and the competition between them led to the change in tungsten content:…”

Section: Electrodeposition Of Ni-w Alloyssupporting

confidence: 64%

“…However, the organic chelating agents inevitably decompose during electroplating, and the electro-productions are difficult to remove completely, usually resulting in bad coatings which peel and have a low hardness. Pyrophosphate, a carbon-free chelating agent, is widely used in the electroplating field, while Ni-W coatings from the bath are rarely reported [20]. Therefore, the pyrophosphate chelating agent was selected in this work.…”

Section: Introductionmentioning

confidence: 99%

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Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Liu

et al. 2021

Coatings

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Electrodeposited Ni-W alloy coatings are considered to be one of the most suitable candidate coatings to replace carcinogenic hexavalent chromium coatings. In this work, Ni-W alloys are electrodeposited from pyrophosphate baths containing different concentrations of Na2WO4 2H2O (CW) at 40 °C. Both CW and the applied current density can affect the W content in the coatings. The effect of CW becomes weaker with the increased current density. The Ni-W alloys with 15 ± 5 wt.% W (Ni-15 wt.% W) are obtained from the bath containing 40 g L−1 CW at a high current of 8 A dm−2. The microhardness, corrosion resistance and hydrogen evolution reaction (HER) are measured with a microhardness tester and an electrochemical workstation. The modified properties are studied by heat treatment from 200 to 700 °C. The highest microhardness of 895.62 HV and the better HER property is presented after heat treatment at 400 °C, while the best corrosion resistance in 3.5 wt.% NaCl solution appears at 600 °C.

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Section: Electrodeposition Of Ni-w Alloyssupporting

confidence: 68%

Section: Electrodeposition Of Ni-w Alloyssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Liu

et al. 2021

Coatings

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“…The surface roughness of the Ti felt had an effect on the surface roughness of the electrodeposited IrO 2 layer. The IrO 2 /Ti-0 electrode (Figures 3A,B) displayed cracks on the IrO 2 layer that may be attributed to a high level of internal stress (Suvorov et al, 2018). Conversely, regarding the IrO 2 /Ti-30 electrode (Figures 3C,D), the coated IrO 2 layer was flat and had minute visible cracks.…”

Section: Resultsmentioning

confidence: 97%

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

et al. 2020

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Under acidic conditions, IrO 2 exhibits high catalytic activity with respect to the oxygen evolution reaction (OER). However, the practical application of Ir-based catalysts is significantly limited owing to their high cost in addition to the scarcity of the metal. Therefore, it is necessary to improve the efficiency of the utilization of such catalysts. In this study, IrO 2-coated Ti felt (IrO 2 /Ti) electrodes were prepared as high-efficiency catalysts for the OER under acidic conditions. By controlling the surface roughness of the Ti substrate via wet etching, the optimum Ti substrate surface area for application in the IrO 2 /Ti electrode was determined. Additionally, the IrO 2 film that was electrodeposited on the 30 min etched Ti felt had a large surface area and a uniform morphology. Furthermore, there were no micro-cracks and the electrode obtained (IrO 2 /Ti-30) exhibited superior catalytic performance with respect to the OER, with a mass activity of 362.3 A g −1 Ir at a potential of 2.0 V (vs. RHE) despite the low Ir loading (0.2 mg cm −2). Therefore, this proposed strategy for the development of IrO 2 /Ti electrodes with substrate surface control via wet etching has potential for application in the improvement of the efficiency of catalyst utilization with respect to the OER.

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“…The cracked regions and nodules are found to be Ni-rich, while the surface showed a reasonable Ni/P ratio varying from ∼ 6 to 20. Several novel studies and strategies are emerging for the development of crack free coatings of several metals including Ni-alloys [57,58]. Higher current during deposition resulted in uniform, and thicker deposits of spheroid type with consistent Ni/P ratio (7 to 9) on the surface, reduced resistance due to porosity, low charge transfer resistance and highest electrochemical performance for hydrogen evolution reaction in alkaline media.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, microstructure and electrochemical properties of Ni-P-based alloy coatings for hydrogen evolution reaction in alkaline media

Gaikwad,

Banerjee,

Pai

et al. 2023

Mater. Res. Express

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Alkaline water electrolysis driven by renewable energy is a promising technology for green hydrogen generation. The cathode half-cell reaction i.e., the hydrogen evolution reaction (HER) in alkaline water electrolysis suffers from slow kinetics. Ni-P-based alloys have shown to be an efficient and cost-effective electrocatalyst to accelerate the HER rate. In this study, three Ni-P alloy coatings are prepared via electrodeposition by varying the deposition currents viz. 10 mA cm-2 direct, 10 mAcm-2 and 100 mAcm-2 pulsed currents. The XRD patterns of all the Ni-P coatings exhibited the formation of crystalline deposits and confirmed the alloying of P in Ni. The SEM images suggested that the microstructures of the Ni-P alloy deposits are highly dependent on the magnitude and waveform of the applied current employed during preparation of the alloy coatings. The composition of the alloy surface is Ni-rich in all three cases but exhibited local variations as evaluated by EDX. The surface distributions of Ni and P in the pulsed deposited samples are more uniform and homogeneous. The cyclic voltammetry patterns of the Ni-P coatings in KOH media exhibit characteristic peaks due to Ni/Ni3+ redox phenomenon. The Ni2+/Ni3+ oxidation peak area is lowest for the direct deposited sample and highest for the pulsed deposited one (100 mAcm-2). The Ni-P alloy electrocatalyst deposited under pulsed mode at 100 mAcm-2 exhibits a current density of -10 mAcm-2 at 0.09 V overpotential and is most active among all samples. The remarkable electrocatalytic activity of this sample is attributed to its smaller crystallite size, better morphological characteristics and lesser resistances to charge transfer and porosity.

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Electrochemical Deposition of Ni–W Crack-Free Coatings

Cited by 18 publications

References 28 publications

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

Synthesis, microstructure and electrochemical properties of Ni-P-based alloy coatings for hydrogen evolution reaction in alkaline media

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