Determination of NiS, NiSe and PdS formation orders during electroreduction of thiocyanate, selenocyanate and thiourea complexes of Ni(II) and PD(II) at mercury electrodes

Hrynaszkiewicz, T.; Kozlowski, Jan; Cieszyńska, E.; Krogulec, Tadeusz

doi:10.1016/0022-0728(93)03045-q

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…However, electrochemical studies of such ions are limited. Exceptions are studies of thiocyanate and selenocyanate ions which were found to undergo catalytic reduction, accompanying the nickel(II) electroreduction at mercury electrodes [3][4][5]. Contrary to results obtained for SCN À and SeCN À , analogous studies carried out on the azide complexes of nickel(II) [6] showed only the electroreduction of the central ion at the mercury electrode.…”

Section: Introductioncontrasting

confidence: 48%

The electroreduction of azides bound to nickel(II) ions in weak acidic media

Jurczakowski¹,

Orlik²

2005

Journal of Electroanalytical Chemistry

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Section: Introductioncontrasting

confidence: 48%

The electroreduction of azides bound to nickel(II) ions in weak acidic media

Jurczakowski¹,

Orlik²

2005

Journal of Electroanalytical Chemistry

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“…Elsewhere, Muller et al have shown that the adsorption of TU onto a Pt surface is connected with the rupture of the C−S bond and formation of at least two types of adsorbed species, namely, an adsorbed sulfur ( S ads ) and carbon C-containing species . Moreover, TU forms S 2− , cyanide, and ammine species by an irreversible reaction , T U + 2 e − → S 2 − + C N − + N H 4 + …”

Section: Resultsmentioning

confidence: 99%

“…Comparing Figure b to Figure a, a clear increase in the impedance is noticeable which is related to TU addition. Generally, TU adsorbs on the surface of the electrode ,,, and increases the double-layer impedance. In fact, this is the reason for using TU (and its derivatives) as a corrosion inhibitor .…”

Section: Resultsmentioning

confidence: 99%

“…Such a reaction previously has been proposed for zinc sulfide and nickel sulfide electrodeposition from TU-containing solutions. 58,59 During the 50 cycles of our CV experiment, the cathodic scan of the first cycle exhausts the [CuTU] 2þ species by reactions 8À10. If this is true, then the anodic scan of the first cycle should increase the local concentration of [CuTU] 2þ on the surface of the electrode by TU-assisted copper dissolution (peak A1 of Figure 9).…”

Section: Cyclic Voltammetry Studymentioning

confidence: 99%

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Electrodeposition and Growth Mechanism of Copper Sulfide Nanowires

2011

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Thiourea (TU) is widely used as a corrosion inhibitor or as an additive in metal (e.g., copper) electroplating baths. TU facilitates the formation of uniform deposits with high brightness. In this study pertaining to the electrosynthesis of copper sulfide nanowires from dilute Cu 2þ containing solution, TU was used as a copper ion complexing agent and sulfur source. Nanowires with various diameters and lengths were obtained via single-step pulsed potential electrodeposition. The electrodeposition time can be used to control the diameter of the electrodeposited nanowires to within the range of 30À100 nm. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed that nanowires are formed from covellite (CuS) and djurleite (Cu 1.94 S). The crystal structures of these phases were observed by high-resolution transmission electron microscopy (HRTEM). Cyclic voltammetry and electrochemical impedance spectroscopy have been applied to analyze the growth process of the nanowires. The formation of complexes of copper ions and TU was found to be a key factor in the nanowire growth process. A diffusion-controlled growth mechanism is proposed to interpret the growth behavior of the nanowires and the change in the product morphology. According to the proposed mechanism, during the cathodic pulses, copper and copper sulfide deposits, and afterward, during the anodic pulses, the deposited copper electrochemically dissolves. Dissolution of copper during the anodic pulses is shown to inhibit the quasi-anomalous codeposition of copper sulfide and copper.

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“…(ii) Simultaneously, the dissociation of thioacetamide produces H 2 S gas followed by a reversible reaction that rapidly accumulates the S 2− ions depending on the pH and temperature of the medium used for co-precipitation of metal sulfide species. The controlled mechanism of thioacetamide dissociation with thermal equilibrium is expressed by eqn (5) and (6), 45,46 CH 3 CSNH 2 + 2H 2 O → CH 3 COOH + NH 3 + H 2 SH 2 S ↔ HS − + H + HS − ↔ S − + H + S − + M + → MS…”

Section: Resultsmentioning

confidence: 99%