KFU. Card publication. Two-step one-pot electrosynthesis and catalytic activity of xCoO

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FEDERAL UNIVERSITY

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TWO-STEP ONE-POT ELECTROSYNTHESIS AND CATALYTIC ACTIVITY OF XCOO&NDASH;YCO(OH)2-SUPPORTED SILVER NANOPARTICLES

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Ziganshina Albina Yulduzovna, author

Bibliographic description in the original language

Yanilkin, V.V. Two-step one-pot electrosynthesis and catalytic activity of xCoO–yCo(OH)2-supported silver nanoparticles / V. V. Yanilkin, R. R. Fazleeva, G. R. Nasretdinova, Y. N. Osin, A. T. Gubaidullin, A. Y. Ziganshina // J. Solid State Electrochem. - 2020. – 24. – 829–842.

Annotation

Efficient two-step electrosynthesis of xCoO–yCo(OH)2 (CoOxHy)-supported silver nanoparticles (AgNPs) is carried out in N,N-dimethylformamide (DMF) using atmospheric oxygen as a reagent and mediator at the potentials of its reduction to the superoxide ion. In the first step, the reduction of oxygen in the presence of Co (II) ions added to the solution as a salt or generated upon dissolution of a Co anode by means of electrolysis results in a mixture of amorphous cobalt oxide CoO and its hydrated form Co (OH)2. The addition of Ag+ ions to the resulting solution of CoOxHy by similar methods results in two parallel reactions of Ag+ reduction to give AgNPs: reversible reduction by CoO and irreversible reduction by DMF. In the second step, oxygen-mediated electroreduction of CoO+ and residual quantities of Ag+ occurs, as well as regeneration of CoOxHy. The resulting spherical AgNPs are bound and stabilized by the CoOxHy matrix. Both steps occur quantitatively and consume the theoretical amount of electricity (2 F with respect to Co2+ in the first step and 1 F with respect to Ag+ in the second step). Depending on the production method, the size of the AgNPs varies in a range from 7?2 to 27?10 nm. The Ag/CoOxHy nanocomposites obtained exhibit catalytic activity in the p-nitrophenol reduction with sodium borohydride in an aqueous medium. Their activity caused by AgNPs significantly increases in the presence of cetyltrimethylammonium chloride (CTAC), a micelle-forming cationic surfactant.

Keywords

silver nanoparticles

The name of the journal

Journal of Solid State Electrochemistry

URL

https://link.springer.com/article/10.1007/s10008-020-04526-0#citeas

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=262832&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ziganshina Albina Yulduzovna	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Yanilkin, V.V. Two-step one-pot electrosynthesis and catalytic activity of xCoO–yCo(OH)2-supported silver nanoparticles / V. V. Yanilkin, R. R. Fazleeva, G. R. Nasretdinova, Y. N. Osin, A. T. Gubaidullin, A. Y. Ziganshina // J. Solid State Electrochem. - 2020. – 24. – 829–842.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=262832&p_lang=2	ru_RU
dc.description.abstract	Journal of Solid State Electrochemistry	ru_RU
dc.description.abstract	Efficient two-step electrosynthesis of xCoO–yCo(OH)2 (CoOxHy)-supported silver nanoparticles (AgNPs) is carried out in N,N-dimethylformamide (DMF) using atmospheric oxygen as a reagent and mediator at the potentials of its reduction to the superoxide ion. In the first step, the reduction of oxygen in the presence of Co (II) ions added to the solution as a salt or generated upon dissolution of a Co anode by means of electrolysis results in a mixture of amorphous cobalt oxide CoO and its hydrated form Co (OH)2. The addition of Ag+ ions to the resulting solution of CoOxHy by similar methods results in two parallel reactions of Ag+ reduction to give AgNPs: reversible reduction by CoO and irreversible reduction by DMF. In the second step, oxygen-mediated electroreduction of CoO+ and residual quantities of Ag+ occurs, as well as regeneration of CoOxHy. The resulting spherical AgNPs are bound and stabilized by the CoOxHy matrix. Both steps occur quantitatively and consume the theoretical amount of electricity (2 F with respect to Co2+ in the first step and 1 F with respect to Ag+ in the second step). Depending on the production method, the size of the AgNPs varies in a range from 7?2 to 27?10 nm. The Ag/CoOxHy nanocomposites obtained exhibit catalytic activity in the p-nitrophenol reduction with sodium borohydride in an aqueous medium. Their activity caused by AgNPs significantly increases in the presence of cetyltrimethylammonium chloride (CTAC), a micelle-forming cationic surfactant.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Two-step one-pot electrosynthesis and catalytic activity of xCoO–yCo(OH)2-supported silver nanoparticles	ru_RU
dc.type	Articles in international journals and collections	ru_RU