KFU. Card publication. Two-step electrosynthesis and catalytic activity of CoO−CoO ? xH2O-supported Ag, Au, and Pd nanoparticles

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FEDERAL UNIVERSITY

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TWO-STEP ELECTROSYNTHESIS AND CATALYTIC ACTIVITY OF COO−COO ? XH2O-SUPPORTED AG, AU, AND PD 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

Fazleeva R. R. Two-step electrosynthesis and catalytic activity of CoO−CoO ? xH2O-supported Ag, Au, and Pd nanoparticles / R. R. Fazleeva, G. R. Nasretdinova, Yu. N. Osin, A. Yu. Ziganshina, V. V. Yanilkin // Russ. Chem. Bull. – 2020. – 69. – 241–254.

Annotation

Two-step electrosynthesis of CoO-CoO?xH2O-supported metal nanoparticles (MNPs, M = Au, Ag, Pd) was carried out in N,N-dimethylformamide in the absence and in presence of poly(N-vinylpyrrolidone) (PVP) using atmospheric oxygen as both a reagent and a mediator at potentials of its reduction to a superoxide radical anion. In the first step, oxygen reduction in the presence of Co2+ ions added to the solution as a salt or generated by dissolving the Co-anode during electrolysis produces a mixture of cobalt oxide CoO and its hydrated form CoO-CoO ? xH2O (CoOxHy ). When Ag+, Au+, Pd2+ ions are added to the obtained solution of CoOx H y, a redox reaction between CoO and the metal ion gives the MNPs and CoO+. In the second step, oxygen-mediated electroreduction of CoO+ serving as the second mediator is carried out, and the redox reaction is completely shifted towards the formation of MNPs. In the absence of PVP, AgNPs (18?4 nm) bind and stabilize completely in the CoOxHy matrix, PdNPs (6?1 nm) stabilize only partially, and AuNPs (21?10 nm) do not bind and, therefore, only their agglomerates are obtained (~200 nm). In the presence of PVP, individual AgNPs (5?2 nm), AuNPs (13?5 nm), PdNPs (3?1 nm) are stabilized in the PVP shell and are bound by the matrix. The obtained nanocomposites M/CoOx H y and M@PVP/CoOxHy catalyze the reduction of p-nitrophenol with sodium borohydride in an aqueous medium. Their catalytic activity is due to MNPs; CoOx H y acts as an inert matrix.

Keywords

nanoparticles

The name of the journal

Russian Chemical Bulletin

URL

https://link.springer.com/article/10.1007/s11172-020-2752-4#citeas

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

https://repository.kpfu.ru/eng/?p_id=262861&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	Fazleeva R. R. Two-step electrosynthesis and catalytic activity of CoO−CoO ? xH2O-supported Ag, Au, and Pd nanoparticles / R. R. Fazleeva, G. R. Nasretdinova, Yu. N. Osin, A. Yu. Ziganshina, V. V. Yanilkin // Russ. Chem. Bull. – 2020. – 69. – 241–254.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=262861&p_lang=2	ru_RU
dc.description.abstract	Russian Chemical Bulletin	ru_RU
dc.description.abstract	Two-step electrosynthesis of CoO-CoO?xH2O-supported metal nanoparticles (MNPs, M = Au, Ag, Pd) was carried out in N,N-dimethylformamide in the absence and in presence of poly(N-vinylpyrrolidone) (PVP) using atmospheric oxygen as both a reagent and a mediator at potentials of its reduction to a superoxide radical anion. In the first step, oxygen reduction in the presence of Co2+ ions added to the solution as a salt or generated by dissolving the Co-anode during electrolysis produces a mixture of cobalt oxide CoO and its hydrated form CoO-CoO ? xH2O (CoOxHy ). When Ag+, Au+, Pd2+ ions are added to the obtained solution of CoOx H y, a redox reaction between CoO and the metal ion gives the MNPs and CoO+. In the second step, oxygen-mediated electroreduction of CoO+ serving as the second mediator is carried out, and the redox reaction is completely shifted towards the formation of MNPs. In the absence of PVP, AgNPs (18?4 nm) bind and stabilize completely in the CoOxHy matrix, PdNPs (6?1 nm) stabilize only partially, and AuNPs (21?10 nm) do not bind and, therefore, only their agglomerates are obtained (~200 nm). In the presence of PVP, individual AgNPs (5?2 nm), AuNPs (13?5 nm), PdNPs (3?1 nm) are stabilized in the PVP shell and are bound by the matrix. The obtained nanocomposites M/CoOx H y and M@PVP/CoOxHy catalyze the reduction of p-nitrophenol with sodium borohydride in an aqueous medium. Their catalytic activity is due to MNPs; CoOx H y acts as an inert matrix.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Two-step electrosynthesis and catalytic activity of CoO−CoO ? xH2O-supported Ag, Au, and Pd nanoparticles	ru_RU
dc.type	Articles in international journals and collections	ru_RU