Investigation of the surface composition of electrodeposited black chromium by X-ray photoelectron spectroscopy

Surviliene, S.; Češūnienė, A.; Jasulaitienė, Vitalija; Jureviciute, Irena

doi:10.1016/j.apsusc.2014.11.052

Cited by 15 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…XPS has thrown some light towards characterizing this type of films [29,32,39,40], showing either a pure Cr 2 O 3 phase [29,39], a mixture of Cr 2 O 3 and Cr(OH) 3 [40], or a much more complex matrix of different Cr(III) oxyhydroxides [32]. The XPS investigation made in the present work (Fig.…”

Section: Surface Characterizationmentioning

confidence: 69%

Electrochemical Investigation of the Hydrogen Evolution Reaction on Electrodeposited Films of Cr(OH)3 and Cr2O3 in Mild Alkaline Solutions

et al. 2017

View full text Add to dashboard Cite

The hydrogen evolution reaction (HER) from water reduction is the main cathodic reaction in the sodium chlorate process. The reaction typically takes place on electrodes covered with a Cr(III) oxide-like film formed in situ by reduction of sodium dichromate in order to avoid reduction of hypochlorite and thereby increase the selectivity for the HER. However, the chemical structure of the Cr(III) oxide-like film is still under debate. In the present work, the kinetics of the HER were studied using titanium electrodes covered with electrodeposited Cr(OH) 3 or Cr 2 O 3 , which were characterized by means of scanning electron microscopy (SEM), energydispersive x-ray spectroscopy (EDX), x-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. A clear difference in the morphology of the deposited surfaces was obtained, and the structure could be revealed with Raman spectroscopy. The kinetics for the HER were investigated using potentiodynamic and potentiostatic techniques. The results show that the first electron transfer is rate limiting and that the activity decreases in the order Cr 2 O 3 @Ti > bare Ti > Cr(OH) 3 @Ti. The low activity obtained for Cr(OH) 3 @Ti is discussed in terms of the involvement of structural water in the HER and the slow ligand exchange rate for water in Cr(III) complexes, while the high activity obtained for Cr 2 O 3 @Ti is rationalized by a surface area effect in combination with reduction of surface water and water in solution.

show abstract

Section: Surface Characterizationmentioning

confidence: 69%

Electrochemical Investigation of the Hydrogen Evolution Reaction on Electrodeposited Films of Cr(OH)3 and Cr2O3 in Mild Alkaline Solutions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Based on the EDX analysis, a Cr:O ratio of 1:0.75 was obtained for Cr(OH) 3 @Au, which is clearly smaller than the Cr:O ratio of 1:3 expected for Cr(OH) 3 . Metallic Cr has been detected after electrodeposition of Cr(OH) 3 ,, and the interpretation is that Cr metal is formed together with the hydroxide or oxide. XRD was used to detect the presence of metallic Cr, but the diffractograms showed only peaks related to the substrate (Figure S2).…”

Section: Resultsmentioning

confidence: 99%

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Gomes

Busch²,

Wildlock

et al. 2018

ChemistrySelect

View full text Add to dashboard Cite

Chlorate production is a highly energy demanding industrial process, where chlorate formation is accompanied with hydrogen formation on the cathode. To ensure a high cathodic current efficiency, sodium dichromate is added to the chlorate electrolyte to avoid reduction of hypochlorite formed as a reaction intermediate in the process. However, chromate is highly toxic to humans and environment, and therefore a replacement is desired. A model system with ex situ formed chromium oxide/hydroxide films were used to study hypochlorite reduction and hydrogen evolution. The experimental results demonstrate that the hypochlorite reduction is fully blocked while hydrogen evolution readily occurs. However, in the presence of hypochlorite the hydrogen evolution reaction is inhibited. By combining experimental findings with density functional theory (DFT) calculations, the mechanism of hypochlorite reduction was revealed and the reason for inhibition by the deposited chromium(III) film was demonstrated. Based on these results possible replacements for chromate are suggested.

show abstract

“…Related to chromium, 𝐶𝐶𝑟𝑟 2𝑝𝑝 3/2 and 2𝑝𝑝 1/2 elemental (metallic) emissions located at 573.9 eV and 583.0 eV binding energies are observed. Also, 𝐶𝐶𝑟𝑟 2𝑝𝑝 3/2 and 2𝑝𝑝 1/2 emissions located at 577.0 eV and 586.7 eV are observed, which correspond to oxidized chromium (probably 𝐶𝐶𝑟𝑟 2 𝐹𝐹 3 ) [36].…”

Section: Discussionmentioning

confidence: 95%

Magnetic, Magnetoelastic and Corrosion Resistant Properties of (Fe–Ni)-Based Metallic Glasses for Structural Health Monitoring Applications

et al. 2019

View full text Add to dashboard Cite

We have performed a study of the magnetic, magnetoelastic, and corrosion resistance properties of seven different composition magnetoelastic-resonant platforms. For some applications, such as structural health monitoring, these materials must have not only good magnetomechanical properties, but also a high corrosion resistance. In the fabricated metallic glasses of composition 73− 5 10 12 , the Fe/Ni ratio was varied (Fe + Ni = 73% at. ) thus changing the magnetic and magnetoelastic properties. A small amount of chromium (Cr 5 ) was added in order to achieve the desired good corrosion resistance. As expected, all the studied properties change with the composition of the samples. Alloys containing a higher amount of Ni than Fe do not show magnetic behavior at room temperature, while iron-rich alloys have demonstrated not only good magnetic properties, but also good magnetoelastic ones, with magnetoelastic coupling coefficient as high as 0.41 for = 0 in the 73 0 5 10 12 (the sample containing only Fe but not Ni ). Concerning corrosion resistance, we have found a continuous degradation of these properties as the Ni content increases in the composition. Thus, the corrosion potential decreases monotonously from 46.74 mV for the = 0, composition 73 0 5 10 12 to −239.47 mV for the = 73, composition 0 73 5 10 12 .

show abstract

Investigation of the surface composition of electrodeposited black chromium by X-ray photoelectron spectroscopy

Cited by 15 publications

References 20 publications

Electrochemical Investigation of the Hydrogen Evolution Reaction on Electrodeposited Films of Cr(OH)3 and Cr2O3 in Mild Alkaline Solutions

Electrochemical Investigation of the Hydrogen Evolution Reaction on Electrodeposited Films of Cr(OH)3 and Cr2O3 in Mild Alkaline Solutions

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Magnetic, Magnetoelastic and Corrosion Resistant Properties of (Fe–Ni)-Based Metallic Glasses for Structural Health Monitoring Applications

Contact Info

Product

Resources

About