dc.contributor.author |
Fazleeva R.R. |
|
dc.contributor.author |
Nasretdinova G.R. |
|
dc.contributor.author |
Osin Y.N. |
|
dc.contributor.author |
Ziganshina A.Y. |
|
dc.contributor.author |
Yanilkin V.V. |
|
dc.date.accessioned |
2021-02-25T20:38:00Z |
|
dc.date.available |
2021-02-25T20:38:00Z |
|
dc.date.issued |
2020 |
|
dc.identifier.issn |
1066-5285 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/162118 |
|
dc.description.abstract |
© 2020, Springer Science+Business Media LLC. 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. |
|
dc.relation.ispartofseries |
Russian Chemical Bulletin |
|
dc.subject |
cobalt(II) oxide |
|
dc.subject |
electrochemical synthesis |
|
dc.subject |
nanocomposite |
|
dc.subject |
oxygen-mediated electroreduction |
|
dc.title |
Two-step electrosynthesis and catalytic activity of CoO−CoO • xH<inf>2</inf>O-supported Ag, Au, and Pd nanoparticles |
|
dc.type |
Article |
|
dc.relation.ispartofseries-issue |
2 |
|
dc.relation.ispartofseries-volume |
69 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.relation.startpage |
241 |
|
dc.source.id |
SCOPUS10665285-2020-69-2-SID85083111530 |
|