Methodical aspects of studying the electroreduction of nitrate on modified single crystal Pt(hkl) + Cu electrodes

Rudnev, Alexander V.; Molodkina, E. B.; Ehrenburg, Maria R.; Fedorov, Roman G.; Данилов, А. И.; Polukarov, Yu. M.; Feliu, Juan M.

doi:10.1134/s1023193509090110

Cited by 19 publications

(18 citation statements)

References 30 publications

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“…In the range of 0.85-1.10 V redox peaks of NO↔NO 2 -process are observed [28]. Complete removing of NO adlayer is occurred at negative-going potential sweep to 0.05 V at enough low sweep rate (NO reduction to ammonia starts at 0.3 V, ammonia is desorbed due to competitive adsorption of hydrogen) [24,[27][28][29]34], further CVs correspond to practically clean Pt(100) surface (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[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%

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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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Section: Resultsmentioning

confidence: 99%

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

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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“…Methodological aspects of modification of platinum single crystals by Cu adatoms and crystallites were discussed in [29]. Refs.…”

Section: Introductionmentioning

confidence: 99%

“…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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Electrooxidation of Ammonia at Tuned (100)Pt Surfaces by using Epitaxial Thin Films

et al. 2015

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PtxNi100−x thin films (72≤x≤100, 10–25 nm thick) were deposited on MgO (100) substrates by using pulsed laser deposition. As shown from X‐ray diffraction analysis, the formation of a Pt(Ni) solid solution was observed over the Ni range investigated. All PtNi‐based films showed epitaxial growth in the (100) direction at 350 °C, which is in contrast to pure Pt films, where a Ni seeding layer was required to obtain epitaxial deposits at this temperature. X‐ray photoelectron spectroscopy depth‐profile analyses showed a Ni enrichment at the PtNi/MgO interface, which may be at the origin of the epitaxial growth in the alloys. After immersion in acidic media, Ni atoms are totally dissolved from the first ten atomic layers of the PtNi films, forming pure Pt electrodes. On the basis of underpotential‐deposited hydrogen electrochemical analyses, a (100) preferential surface orientation of the crystallites originating from epitaxial growth was confirmed on both Ptseeded and PtxNi100−x films. It was shown that the fraction of (100) terraces and terrace edge sites are a determining factor in the electrooxidation of NH3. The highest electrocatalytic activity was observed with the Ptseeded film.

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Methodical aspects of studying the electroreduction of nitrate on modified single crystal Pt(hkl) + Cu electrodes

Cited by 19 publications

References 30 publications

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

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

Electrooxidation of Ammonia at Tuned (100)Pt Surfaces by using Epitaxial Thin Films

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