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Two-step electrosynthesis and catalytic activity of CoO−CoO • xH<inf>2</inf>O-supported Ag, Au, and Pd nanoparticles

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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

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  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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