Electrochemical reduction of nitrate on Pt(S)[n(1 1 1) × (1 1 1)] electrodes in perchloric acid solution

Taguchi, Satoshi; Feliu, Juan M.

doi:10.1016/j.electacta.2007.03.057

Cited by 87 publications

(84 citation statements)

References 50 publications

(89 reference statements)

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“…Indeed, the non-zero intercept by extrapolation to zero scan rate suggested a second, kinetically controlled reaction. According to the literature [21][22][23], there are two possibilities that will require further investigation:…”

Section: Solvent Extraction and Process Stoichiometrymentioning

confidence: 99%

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Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

et al. 2007

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Results are reported, providing the basis for an elegant new process for metal recovery from acidic solutions, by integrating solvent extraction (SX) and electrowinning (EW) in a single process, rather than operating them separately, as in conventional SX-EW processes. Calixarene-tetramide and its thio-analogue were used for the extraction of silver(I) ions from aqueous phases into dichloromethane, both compounds achieving extraction efficiencies [90%. The effects were determined of extractant and silver(I) concentrations, aqueous phase pH, and the presence of sodium ions, on the distribution of Ag(I) between aqueous and organic phases. Due to the impossibility of stripping the extracted metal conventionally, electro-reductive stripping of silver(I) from the loaded organic phase was carried out in the calixarene/nitric acid two-phase system. The effects were also investigated of current density or electrode potential on silver deposition current efficiencies and cell voltages. Based on experimental data, a new process for silver(I) removal from very dilute solutions was proposed that showed high percentage extractions of silver(I) from the aqueous phase, coupled to direct EW of silver from the calixarene complex in the loaded organic phase, regenerating the extractant for recycle. Current efficiencies in the range from 60% to 90% and cell voltages \3.5 V were achieved simultaneously in this process.

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Section: Solvent Extraction and Process Stoichiometrymentioning

confidence: 99%

“…• Reduction of nitrate in the organic phase, that occurs electro-catalytically on platinum electrodes [21,22]; • Dehalogenation of dichloromethane on freshly deposited silver [23], at potentials \-1.5 V (SCE).…”

Section: Cyclic Voltammetry and Chronoamperometymentioning

confidence: 99%

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

et al. 2007

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“…[1][2][3]. Attention to these processes does not wane due to its fundamental and applied importance.…”

Section: Introductionmentioning

confidence: 99%

“…Attention to these processes does not wane due to its fundamental and applied importance. As the reduction of nitrogen-containing compounds is a structure-sensitive process, the investigations performed at single crystal electrodes are of greatest interest [1][2][3][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The use of the electrodes with clearly characterized surface structure allows revealing the correlations between electrochemical activity of adsorption sites and their structure.…”

Section: Introductionmentioning

confidence: 99%

Redox transformations of adsorbed NO molecules on a Pt(100) electrode

et al. 2013

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Electrochemical behaviour of adsorbed NO molecules on Pt(100) electrode has been studied in perchloric acid solutions by means of cyclic voltammetry. According to literature data, saturated NO adlayer with coverage of ca. 0.5 ML is formed at open circuit conditions in nitrite solution as a result of disproportion reaction. The adlayer is stable in the range of 0.4-0.9 V, NO molecules are oxidized at 0.9-1.1 V and can be reduced to ammonia at potentials less than 0.4 V. Stability of the adlayer depends on surface coverage and extent of the ordering. Unsaturated NO adlayer demonstrates redox transformations NO↔NH 3 at 0.5-0.8 V.

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“…Consequently, there is a possibility to establish a correlation between the structure of adsorption sites and their catalytic activity [17][18][19][20][21][22][23][24][25][26][27][28][29]. Our previous studies of nitrate reduction on Pt(111) and Pt(111) + Cu electrodes [22] have shown that sulfate anions block the adsorption sites on the surface of the modified electrode, thus hindering the adsorption of nitrate anions and their reduction.…”

Section: Introductionmentioning

confidence: 99%

Cu UPD at Pt(100) and stepped faces Pt(610), Pt(410) of platinum single crystal electrodes

2015

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The processes of adsorption/desorption of copper adatoms on the basal Pt(100) face and stepped Pt(610), Pt(410) surfaces have been studied in perchloric acid solution by cyclic voltammetry. It has been shown that the positions of the Cu stripping peaks are determined by perfection of the adlayer. The "island" model is suggested to describe electrochemical behavior of the Pt(hkl)+Cuad system. Obtained results are important for target modification of shape-controlled nanoparticles that are used in electrocatalysis.

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Electrochemical reduction of nitrate on Pt(S)[n(1 1 1) × (1 1 1)] electrodes in perchloric acid solution

Cited by 87 publications

References 50 publications

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

Silver electrowinning from silver(I)–calixarene complexes by two-phase electrolysis

Redox transformations of adsorbed NO molecules on a Pt(100) electrode

Cu UPD at Pt(100) and stepped faces Pt(610), Pt(410) of platinum single crystal electrodes

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