Ni/nano-TiO2 composite electrodeposits: Textural and structural modifications

Spanou, S.; Pavlatou, Evangelia A.; Spyrellis, N.

doi:10.1016/j.electacta.2008.06.068

Cited by 103 publications

(93 citation statements)

References 34 publications

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“…25 Addition of composite particles to the electroplating solution at a low current density and a low pH value changes the preferred orientation of Ni grain growth to (100) grains (represented by (200) reflection). 26 As seen on the XRD results where the preferred orientation of pure Ni is (111), then it changes to (200) of which peak intensity grows with increasing carbon content. Zhang et al found that (100) grains have the lowest stress and the lowest strain energy density in a plane of film surface so that the change in preferred orientation from (111) to (100) may be due to the minimization of the strain energy in consideration of the fact that increasing carbon content gives an increase in internal strain of the plating layer.…”

Section: Resultsmentioning

confidence: 81%

Passivation Behavior and Surface Resistance of Electrodeposited Nickel-Carbon Composites

et al. 2014

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Bipolar plates in fuel cells and redox flow batteries are one of the most expensive components, which become a crucial factor for their commercialization. In this report, nickel and carbon are co-electrodeposited from Watts solution containing carbon black powder, and the Ni-C composites are characterized by SEM, EDS, XRD and surface profilometry. The intrinsic passivation behavior and the sheet resistance of Ni-C are on a par with pure Ni when carbon is introduced less than 26 at% in the composite, but the introduction of carbon to Ni suppresses the increase in sheet resistance after a storage corrosion test, which invites the expectation of high durability as bipolar plate materials. This kind of approach where carbon is introduced to metal-based bipolar plates by electrodeposition can improve the surface properties of pure metal bipolar plates with maintaining their price competitiveness over graphite-based composites and other high cost manufacturing techniques.

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Section: Resultsmentioning

confidence: 81%

Passivation Behavior and Surface Resistance of Electrodeposited Nickel-Carbon Composites

et al. 2014

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“…Considering the electrodeposition of Ni-SiC, Gyftou et al have concluded, from the study of the textural perfection of the deposits, that the presence of nanoparticles led to the worsening of the quality of the [1 0 0] preferred orientation, observing a mixed crystal orientation through [1 0 0] and [2 1 1] axes when high concentration of embedded particles were used (Gyftou et al, 2008). Some authors (Spanou et al, 2009) assume that the modification of metallic orientation in addition to the decrease of crystallite size point to an effective incorporation or embedding of the particles. In accordance with this, the embedding SiC nano-particles in a Ni metallic matrix resulted in the deposition of composite with smaller crystallite sizes and more structural defects than those of pure Ni deposits (Gyftou et al, 2008;Angerer et al, 2009).…”

Section: Characterization Techniquesmentioning

confidence: 99%

“…For the Ni-TiO 2 system, the experimental data revealed that co-deposition of TiO 2 nanoparticles is favoured at low pH values and current densities, implying that there is a plentiful adsorption of H + on the titania surface. As the particle surfaces become positively charged they will be strongly adsorbed on the cathode leading to an enhanced electrolytic co-deposition (Spanou et al, 2009). Nevertheless, in some published works, it is pointed out the electrodeposition of negatively charged particles into Ni matrix with success.…”

Section: Particle Characteristicsmentioning

confidence: 99%

Electrodeposition of Metal Matrix Nanocomposites: Improvement of the Chemical Characterization Techniques

Gomes¹,

Pereira²,

Pereiro³

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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“…Ni matrix composites reinforced by TiO2 nanoparticles can be successfully synthesized by electrodeposition utilizing either sulfamate or Watts plating baths (Spanou et al, 2009). During this process, the powder particles are suspended in a conventional electrolyte and are captured in the growing metal coating (Abdel Aal and Hassan, 2009).…”

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confidence: 99%

Preparation and Characterization of Ni–TiO2 Nanocomposite Coatings Produced by Electrodeposition Technique

et al. 2016

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In this paper, Ni-TiO2 nanocomposite coatings with different sizes of TiO2 nanoparticles were successfully prepared by electrodeposition process from a nickel electrolyte in which the TiO2 nanoparticles were suspended. The influence of relevant deposition parameters on the nanocomposite coating characteristics was discussed. X-ray diffractometer has been applied in order to investigate the phase structure of the nanocomposite coatings. The surface morphology of nanocomposite coatings was characterized by a scanning electron microscopy equipped with an energy dispersive spectroscopy. The electrodeposited nanocomposite coatings obtained at different deposition parameters were evaluated for their mechanical and corrosive properties. Obtained results show that the size of TiO2 nanoparticles and applied current density during deposition process has a direct effect on mechanical and corrosive properties of nanocomposite coatings. Increasing current density and smaller nanoparticle size has affirmative effect on mechanical properties, whereas corrosion resistance of nanocomposite coatings deposited at 3 A dm −2 current density are higher than the coatings prepared at higher current density values.

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Ni/nano-TiO2 composite electrodeposits: Textural and structural modifications

Cited by 103 publications

References 34 publications

Passivation Behavior and Surface Resistance of Electrodeposited Nickel-Carbon Composites

Passivation Behavior and Surface Resistance of Electrodeposited Nickel-Carbon Composites

Electrodeposition of Metal Matrix Nanocomposites: Improvement of the Chemical Characterization Techniques

Preparation and Characterization of Ni–TiO2 Nanocomposite Coatings Produced by Electrodeposition Technique

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