Electrocatalytic formation of polymolecular products at the cathodic polarization of polycrystalline chromium in sulfuric acid solutions of formic and oxalic acids

Vykhodtseva, L. N.; Кулакова, И. И.; Safonov, V. A.

doi:10.1134/s1023193508080016

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…, curves a and b. Lower current than that of the supporting electrolyte (0.05 mol L −1 H 2 SO 4 ) in the presence of FA was also observed by Vykhodtseva et al . They proved that FA is converted to chromium carbide species after contact with the chromium cathode, which inhibits the hydrogen evolution reaction.…”

Section: Resultssupporting

confidence: 55%

“…Apart from CH 4 other hydrocarbons C 2 –C 4 were detected having %CEs lower than 1%. Higher molecular mass hydrocarbons as detected by Vykhodtseva et al . were not detected.…”

Section: Resultsmentioning

confidence: 65%

“…Its analysis by X‐ray Emission Spectroscopy (XES) showed that it consisted mainly of chromium carbides . This deposit can be further reduced at –1.15 V vs SHE to linear saturated hydrocarbons and carboxylic acids containing 12–27 carbon atoms . The co‐deposition of carbon during the electrodeposition of chromium has been verified by subsequent studies .…”

Section: Introductionmentioning

confidence: 71%

“…Apart from CH 4 other hydrocarbons C 2 -C 4 were detected having %CEs lower than 1%. Higher molecular mass hydrocarbons as detected by Vykhodtseva et al14 were not detected. This was attributed to the different conditions of their experiments and especially to the more negative potential (-1.15 V vs SHE or -1.394 V vs SCE) used.…”

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confidence: 69%

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Conversion of carbon dioxide to methanol through the reduction of formic acid on chromium

Kotoulas

Kyriacou

2017

J. Chem. Technol. Biotechnol

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BACKGROUND Formic acid (FA) can be produced from CO2 by high rate and high percentage current efficiency (%CE) which exceeds 90% on some metals. This work aims at the electrochemical conversion of formic acid to methanol (MeOH) by a two‐ step process including the conversion of CO2 to formic acid in the first and the reduction of formic acid to MeOH in the second. RESULTS The main products of the electrochemical reduction of FA in 85% H3PO4, at 80°C on chromium were methyl formate (HCOOMe), MeOH and CH4. The rate of the reduction increased both by increasing the negative potential and the concentration of FA. The total %CE in all experiments exceeded 100% and this was attributed to the cathodic dissolution of chromium which provided an additional reduction capacity. The selectivity to MeOH and HCOOMe was between 89 and 98% and the highest current density was 13 mA cm−2, at –0.95 V. CONCLUSIONS FA is selectively reduced to MeOH and its secondary product HCOOMe on a Cr cathode. The experimental results showed that chromium is the most efficient cathode for the reduction of FA. © 2016 Society of Chemical Industry

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Section: Resultssupporting

confidence: 55%

“…Apart from CH 4 other hydrocarbons C 2 –C 4 were detected having %CEs lower than 1%. Higher molecular mass hydrocarbons as detected by Vykhodtseva et al . were not detected.…”

Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 71%

mentioning

confidence: 69%

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Conversion of carbon dioxide to methanol through the reduction of formic acid on chromium

Kotoulas

Kyriacou

2017

J. Chem. Technol. Biotechnol

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“…6a) is much lower than that recorded in depth of the deposit, which suggests the presence of adsorptive layer with the thickness B8 nm. For comparison, the coatings deposited from aqueous electrolytes are covered with a thick (about 20 nm) passive film consisting of chromium oxides and impurities of organic substances [27][28][29]. Although the positions of Cr2p3 peak corresponding to the metallic (BE = 574.5-575.2 eV) and oxide (BE = 576.5-577.9 eV) forms of chromium differ considerably (about 3 eV), the Cr2p3 peak is barely sensitive to the interaction of organic substances with Cr atoms [30,31].…”

Section: Resultsmentioning

confidence: 99%

Chromium electrodeposition from [BMIm][BF4] ionic liquid

Surviliene¹,

Eugénio

Vilar

2010

J Appl Electrochem

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The electrodeposition of black chromium coatings from ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate with chromium chloride, and the chemical composition of the deposits are discussed in this article. The UV-Vis spectra recorded for chromium(III) species in 1-butyl-3-methylimidazolium tetrafluoroborate suggest that along with the chromium(III) complexes containing three ligands, there are some amounts of chromium species containing four ligands in the bath employed. The cathodic process of chromium electrodeposition in the employed ionic liquid is complicated by the electrochemical reduction of water molecules, which is followed by chemical disintegration of tetrafluoroborate ions. The surface morphology of black chromium films deposited potentiostatically (-1.5 to -2.0 V) at 85°C shows nodules and microcracks increasing in size with cathodic potential. Analysis of the X-ray photoelectron spectra recorded from surface to depth of the deposit has shown that the black oxide-rich chromium coating consists of chromium in both oxide and metallic states with small impurities of other elements (fluorine, boron, carbon and nitrogen) and the surface is covered with a thin layer of organic substances. The results of this study show that 1-butyl-3-methylimidazolium tetrafluoroborate may be considered as a promising substitute of toxic Cr(VI) baths for black chromium plating.

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Current Trends in Electrodeposition of Electrocatalytic Coatings

Protsenko

Данилов

2020

Methods for Electrocatalysis

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Electrocatalytic formation of polymolecular products at the cathodic polarization of polycrystalline chromium in sulfuric acid solutions of formic and oxalic acids

Cited by 7 publications

References 4 publications

Conversion of carbon dioxide to methanol through the reduction of formic acid on chromium

Conversion of carbon dioxide to methanol through the reduction of formic acid on chromium

Chromium electrodeposition from [BMIm][BF4] ionic liquid

Current Trends in Electrodeposition of Electrocatalytic Coatings

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